build: Release v23.1 (bug fix release)

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
vmm: Add 'shutdown()' to vCPU seccomp filter
2026-08-05 02:19:16 +00:00 · 2022-05-09 14:54:18 +01:00 · 2022-05-09 14:54:18 +01:00 · 2022-05-09 14:54:18 +01:00 · 2022-05-09 14:54:18 +01:00 · 2022-05-09 14:54:18 +01:00
193 changed files with 8619 additions and 14128 deletions
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -13,7 +13,7 @@ jobs:
          - stable
          - beta
          - nightly
-          - "1.60"
+          - 1.56
        target:
          - x86_64-unknown-linux-gnu
          - x86_64-unknown-linux-musl
@@ -29,36 +29,35 @@ jobs:
      - name: Install Rust toolchain (${{ matrix.rust }})
        uses: actions-rs/toolchain@v1
        with:
-          toolchain: ${{ matrix.rust }}
-          target: ${{ matrix.target }}
-          override: true
+            toolchain: ${{ matrix.rust }}
+            target: ${{ matrix.target }}
+            override: true
+
+      - name: Debug Check (default features)
+        run: |
+          git rev-list origin/main..$GITHUB_SHA | xargs -t -I % sh -c 'git checkout %; cargo check --tests --all --target=${{ matrix.target }}'
+          git checkout $GITHUB_SHA

      - name: Build (default features)
-        run: cargo rustc --locked --bin cloud-hypervisor -- -D warnings
+        run: cargo rustc --bin cloud-hypervisor -- -D warnings

      - name: Build (common + kvm)
-        run: cargo rustc --locked --bin cloud-hypervisor --no-default-features --features "common,kvm"  -- -D warnings
+        run: cargo rustc --bin cloud-hypervisor --no-default-features --features "common,kvm"  -- -D warnings

      - name: Build (default features + tdx)
-        run: cargo rustc --locked --bin cloud-hypervisor --features "tdx" -- -D warnings
+        run: cargo rustc --bin cloud-hypervisor --features "tdx" -- -D warnings

      - name: Build (default features + amx)
-        run: cargo rustc --locked --bin cloud-hypervisor --features "amx" -- -D warnings
+        run: cargo rustc --bin cloud-hypervisor --features "amx" -- -D warnings

      - name: Build (default features + gdb)
-        run: cargo rustc --locked --bin cloud-hypervisor --features "gdb" -- -D warnings
-
-      - name: Build (default features + guest_debug)
-        run: cargo rustc --locked --bin cloud-hypervisor --features "guest_debug" -- -D warnings
+        run: cargo rustc --bin cloud-hypervisor --features "gdb" -- -D warnings

      - name: Build (common + mshv)
-        run: cargo rustc --locked --bin cloud-hypervisor --no-default-features --features "common,mshv"  -- -D warnings
-
-      - name: Build (common + mshv + kvm)
-        run: cargo rustc --locked --bin cloud-hypervisor --no-default-features --features "common,mshv,kvm"  -- -D warnings
+        run: cargo rustc --bin cloud-hypervisor --no-default-features --features "common,mshv"  -- -D warnings

      - name: Release Build (default features)
-        run: cargo build --locked --all --release --target=${{ matrix.target }}
+        run: cargo build --all --release --target=${{ matrix.target }}

      - name: Check build did not modify any files
        run: test -z "$(git status --porcelain)"
--- a/.github/workflows/quality-aarch64.yaml
+++ b/.github/workflows/quality-aarch64.yaml
@@ -25,16 +25,10 @@ jobs:
      - name: Install Rust toolchain (${{ matrix.rust }})
        uses: actions-rs/toolchain@v1
        with:
-          toolchain: ${{ matrix.rust }}
-          target: ${{ matrix.target }}
-          override: true
-          components: rustfmt, clippy
-
-      - name: Debug Check (default features)
-        run: |
-          git rev-list origin/main..$GITHUB_SHA | xargs -t -I % sh -c 'git checkout %; cargo check --tests --all --target=${{ matrix.target }}'
-          git checkout $GITHUB_SHA
-
+            toolchain: ${{ matrix.rust }}
+            target: ${{ matrix.target }}
+            override: true
+            components: rustfmt, clippy
      - name: Formatting (rustfmt)
        run: cargo fmt -- --check

--- a/.github/workflows/quality.yaml
+++ b/.github/workflows/quality.yaml
@@ -30,34 +30,23 @@ jobs:
          override: true
          components: rustfmt, clippy

-      - name: Debug Check (default features)
-        run: |
-          git rev-list origin/main..$GITHUB_SHA | xargs -t -I % sh -c 'git checkout %; cargo check --tests --all --target=${{ matrix.target }}'
-          git checkout $GITHUB_SHA
-
      - name: Formatting (rustfmt)
        run: cargo fmt -- --check

      - name: Clippy (common + kvm)
-        run: cargo clippy --locked --all --all-targets --no-default-features --tests --features "common,kvm" -- -D warnings
+        run: cargo clippy --all --all-targets --no-default-features --tests --features "common,kvm" -- -D warnings

      - name: Clippy (default features)
-        run: cargo clippy --locked --all --all-targets --tests -- -D warnings
+        run: cargo clippy --all --all-targets --tests -- -D warnings

      - name: Clippy (default features + amx)
-        run: cargo clippy --locked --all --all-targets --tests --features "amx" -- -D warnings
+        run: cargo clippy --all --all-targets --tests --features "amx" -- -D warnings

      - name: Clippy (default features + gdb)
-        run: cargo clippy --locked --all --all-targets --tests --features "gdb" -- -D warnings
-
-      - name: Clippy (default features + guest_debug)
-        run: cargo clippy --locked --all --all-targets --tests --features "guest_debug" -- -D warnings
+        run: cargo clippy --all --all-targets --tests --features "gdb" -- -D warnings

      - name: Clippy (common + mshv)
-        run: cargo clippy --locked --all --all-targets --no-default-features --tests --features "common,mshv" -- -D warnings
-
-      - name: Clippy (common + mshv + kvm)
-        run: cargo clippy --locked --all --all-targets --no-default-features --tests --features "common,mshv,kvm" -- -D warnings
+        run: cargo clippy --all --all-targets --no-default-features --tests --features "common,mshv" -- -D warnings

      - name: Check build did not modify any files
        run: test -z "$(git status --porcelain)"
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -16,23 +16,23 @@ jobs:
      - name: Install Rust toolchain (x86_64-unknown-linux-gnu)
        uses: actions-rs/toolchain@v1
        with:
-            toolchain: "1.62"
+            toolchain: 1.58
            target: x86_64-unknown-linux-gnu
      - name: Install Rust toolchain (x86_64-unknown-linux-musl)
        uses: actions-rs/toolchain@v1
        with:
-            toolchain: "1.62"
+            toolchain: 1.58
            target: x86_64-unknown-linux-musl
      - name: Build
        uses: actions-rs/cargo@v1
        with:
-            toolchain: "1.62"
+            toolchain: 1.58
            command: build
            args: --all --release --target=x86_64-unknown-linux-gnu
      - name: Static Build
        uses: actions-rs/cargo@v1
        with:
-            toolchain: "1.62"
+            toolchain: 1.58
            command: build
            args: --all --release --target=x86_64-unknown-linux-musl
      - name: Strip cloud-hypervisor binaries
@@ -40,7 +40,7 @@ jobs:
      - name: Install Rust toolchain (aarch64-unknown-linux-musl)
        uses: actions-rs/toolchain@v1
        with:
-            toolchain: "1.62"
+            toolchain: 1.58
            target: aarch64-unknown-linux-musl
            override: true
      - name: Static Build (AArch64)
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,3 @@
 **/*.rs.bk
 **/Cargo.lock
 **/rusty-tags.vi
-/rpm/SOURCES
--- a/2
+++ b/2
@@ -1,2 +0,0 @@
-# Add the list of code owners here (using their GitHub username)
-* @cloud-hypervisor/cloud-hypervisor-reviewers
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -2,14 +2,12 @@

 Cloud Hypervisor is an open source project licensed under the [Apache v2
 License](https://opensource.org/licenses/Apache-2.0) and the [BSD 3
-Clause](https://opensource.org/licenses/BSD-3-Clause) license. Individual files
-contain details of their licensing and changes to that file are under the same
-license unless the contribution changes the license of the file. When importing
-code from a third party project (e.g. Firecracker or CrosVM) please respect the
-license of those projects.
-
-New code should be under the [Apache v2
-License](https://opensource.org/licenses/Apache-2.0).
+Clause](https://opensource.org/licenses/BSD-3-Clause) license. Contributions
+can be made under either license or both. Individual files contain details of
+their licensing and changes to that file are under the same license unless the
+contribution changes the license of the file. When importing code from a third
+party project (e.g. Firecracker or CrosVM) please respect the license of those
+projects.

 ## Coding Style

@@ -17,23 +15,6 @@ We follow the [Rust Style](https://github.com/rust-dev-tools/fmt-rfcs/blob/maste
 convention and enforce it through the Continuous Integration (CI) process calling into `rustfmt`
 for each submitted Pull Request (PR).

-## Basic Checks
-
-Please consider creating the following hook as `.git/hooks/pre-commit` in order
-to ensure basic correctness of your code. You can extend this further if you
-have specific features that you regularly develop against.
-
-```sh
-#!/bin/sh
-
-cargo fmt -- --check || exit 1
-cargo check --locked --all --all-targets --tests || exit 1
-cargo clippy --locked --all --all-targets --tests -- -D warnings || exit 1
-```
-
-You will need to `chmod +x .git/hooks/pre-commit` to have it run on every
-commit you make.
-
 ## Certificate of Origin

 In order to get a clear contribution chain of trust we use the [signed-off-by language](https://01.org/community/signed-process)
@@ -82,9 +63,11 @@ you want to merge your changes to `cloud-hypervisor`:
 2. Within your fork, create a branch for your contribution.
 3. [Create a pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/)
   against the main branch of the Cloud Hypervisor repository.
-4. To update your pull request amend existing commits whenever applicable and
+4. Add reviewers to your pull request and then work with your reviewers to address
+   any comments and obtain minimum of 2 [maintainers](MAINTAINERS.md) approvals.
+   To update your pull request amend existing commits whenever applicable and
   then push the new changes to your pull request branch.
-5. Once the pull request is approved it can be integrated.
+5. Once the pull request is approved, one of the maintainers will merge it.

 ## Issue tracking

--- a/Cargo.lock
+++ b/Cargo.lock
@@ -20,9 +20,9 @@ dependencies = [

 [[package]]
 name = "anyhow"
-version = "1.0.62"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1485d4d2cc45e7b201ee3767015c96faa5904387c9d87c6efdd0fb511f12d305"
+checksum = "4361135be9122e0870de935d7c439aef945b9f9ddd4199a553b5270b49c82a27"

 [[package]]
 name = "api_client"
@@ -33,14 +33,15 @@ dependencies = [

 [[package]]
 name = "arc-swap"
-version = "1.5.1"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "983cd8b9d4b02a6dc6ffa557262eb5858a27a0038ffffe21a0f133eaa819a164"
+checksum = "c5d78ce20460b82d3fa150275ed9d55e21064fc7951177baacf86a145c4a4b1f"

 [[package]]
 name = "arch"
 version = "0.1.0"
 dependencies = [
+ "acpi_tables",
 "anyhow",
 "byteorder",
 "fdt",
@@ -49,8 +50,8 @@ dependencies = [
 "linux-loader",
 "log",
 "serde",
+ "serde_derive",
 "thiserror",
- "uuid",
 "versionize",
 "versionize_derive",
 "vm-fdt",
@@ -130,33 +131,24 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"

 [[package]]
 name = "clap"
-version = "3.2.17"
+version = "3.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29e724a68d9319343bb3328c9cc2dfde263f4b3142ee1059a9980580171c954b"
+checksum = "71c47df61d9e16dc010b55dba1952a57d8c215dbb533fd13cdd13369aac73b1c"
 dependencies = [
 "atty",
 "bitflags",
- "clap_lex",
 "indexmap",
- "once_cell",
+ "lazy_static",
+ "os_str_bytes",
 "strsim",
 "termcolor",
 "terminal_size",
 "textwrap",
 ]

-[[package]]
-name = "clap_lex"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
-dependencies = [
- "os_str_bytes",
-]
-
 [[package]]
 name = "cloud-hypervisor"
-version = "26.0.0"
+version = "23.1.0"
 dependencies = [
 "anyhow",
 "api_client",
@@ -165,10 +157,10 @@ dependencies = [
 "epoll",
 "event_monitor",
 "hypervisor",
+ "lazy_static",
 "libc",
 "log",
 "net_util",
- "once_cell",
 "option_parser",
 "seccompiler",
 "serde_json",
@@ -196,41 +188,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55626594feae15d266d52440b26ff77de0e22230cf0c113abe619084c1ddc910"

-[[package]]
-name = "darling"
-version = "0.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4529658bdda7fd6769b8614be250cdcfc3aeb0ee72fe66f9e41e5e5eb73eac02"
-dependencies = [
- "darling_core",
- "darling_macro",
-]
-
-[[package]]
-name = "darling_core"
-version = "0.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "649c91bc01e8b1eac09fb91e8dbc7d517684ca6be8ebc75bb9cafc894f9fdb6f"
-dependencies = [
- "fnv",
- "ident_case",
- "proc-macro2",
- "quote",
- "strsim",
- "syn",
-]
-
-[[package]]
-name = "darling_macro"
-version = "0.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddfc69c5bfcbd2fc09a0f38451d2daf0e372e367986a83906d1b0dbc88134fb5"
-dependencies = [
- "darling_core",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "devices"
 version = "0.1.0"
@@ -240,7 +197,7 @@ dependencies = [
 "arch",
 "bitflags",
 "byteorder",
- "hypervisor",
+ "epoll",
 "libc",
 "log",
 "versionize",
@@ -300,26 +257,21 @@ version = "0.1.0"
 dependencies = [
 "libc",
 "serde",
+ "serde_derive",
 "serde_json",
 ]

 [[package]]
 name = "fdt"
-version = "0.1.4"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "964f5becd44d069dca0beea2b4bc05639ae7bf3b3f5369c295aff360bb57cca2"
-
-[[package]]
-name = "fnv"
-version = "1.0.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+checksum = "b643857cf70949306b81d7e92cb9d47add673868edac9863c4a49c42feaf3f1e"

 [[package]]
 name = "gdbstub"
-version = "0.6.2"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c1f9371c87c11642ee94dcf92cb48b1484ba250b8e8bff3df71c28651f3f4e7"
+checksum = "9fa2ca5d6b045de372cef3991f873389b421b4cabcfbe52f7787fae8b8b37906"
 dependencies = [
 "bitflags",
 "cfg-if",
@@ -331,9 +283,9 @@ dependencies = [

 [[package]]
 name = "gdbstub_arch"
-version = "0.2.3"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c24f469ba9556c5a063d6df35a8a338025fccf96ecae44f330a156b686f7a268"
+checksum = "51dc4b5718ac76d21e8605c0966dd32d80273b89b11e6cfef467b04e45934d37"
 dependencies = [
 "gdbstub",
 "num-traits",
@@ -341,9 +293,9 @@ dependencies = [

 [[package]]
 name = "getrandom"
-version = "0.2.7"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
+checksum = "9be70c98951c83b8d2f8f60d7065fa6d5146873094452a1008da8c2f1e4205ad"
 dependencies = [
 "cfg-if",
 "libc",
@@ -358,9 +310,9 @@ checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"

 [[package]]
 name = "hashbrown"
-version = "0.12.3"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"

 [[package]]
 name = "hermit-abi"
@@ -382,8 +334,8 @@ name = "hypervisor"
 version = "0.1.0"
 dependencies = [
 "anyhow",
- "byteorder",
 "env_logger",
+ "epoll",
 "iced-x86",
 "kvm-bindings",
 "kvm-ioctls",
@@ -392,9 +344,9 @@ dependencies = [
 "mshv-bindings",
 "mshv-ioctls",
 "serde",
- "serde_with",
+ "serde_derive",
+ "serde_json",
 "thiserror",
- "vfio-ioctls",
 "vm-memory",
 "vmm-sys-util",
 ]
@@ -409,17 +361,11 @@ dependencies = [
 "static_assertions",
 ]

-[[package]]
-name = "ident_case"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
-
 [[package]]
 name = "indexmap"
-version = "1.9.1"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
+checksum = "0f647032dfaa1f8b6dc29bd3edb7bbef4861b8b8007ebb118d6db284fd59f6ee"
 dependencies = [
 "autocfg",
 "hashbrown",
@@ -436,9 +382,9 @@ dependencies = [

 [[package]]
 name = "io-uring"
-version = "0.5.3"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "427496d698429d86ff947537dff68facb83fe753b7abea4fab4ac1c4b7a4b94b"
+checksum = "8d75829ed9377bab6c90039fe47b9d84caceb4b5063266142e21bcce6550cda8"
 dependencies = [
 "bitflags",
 "libc",
@@ -446,18 +392,18 @@ dependencies = [

 [[package]]
 name = "ipnetwork"
-version = "0.19.0"
+version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f84f1612606f3753f205a4e9a2efd6fe5b4c573a6269b2cc6c3003d44a0d127"
+checksum = "4088d739b183546b239688ddbc79891831df421773df95e236daf7867866d355"
 dependencies = [
 "serde",
 ]

 [[package]]
 name = "itoa"
-version = "1.0.3"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8af84674fe1f223a982c933a0ee1086ac4d4052aa0fb8060c12c6ad838e754"
+checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"

 [[package]]
 name = "kvm-bindings"
@@ -472,7 +418,7 @@ dependencies = [
 [[package]]
 name = "kvm-ioctls"
 version = "0.11.0"
-source = "git+https://github.com/rust-vmm/kvm-ioctls?branch=main#ccf0bda07485b2433616de998c000aa5f04ce806"
+source = "git+https://github.com/rust-vmm/kvm-ioctls?branch=main#1e03e29cdfbb0cb108a98de7a78045a5a517f18e"
 dependencies = [
 "kvm-bindings",
 "libc",
@@ -487,9 +433,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"

 [[package]]
 name = "libc"
-version = "0.2.131"
+version = "0.2.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04c3b4822ccebfa39c02fc03d1534441b22ead323fa0f48bb7ddd8e6ba076a40"
+checksum = "cb691a747a7ab48abc15c5b42066eaafde10dc427e3b6ee2a1cf43db04c763bd"

 [[package]]
 name = "libssh2-sys"
@@ -507,9 +453,9 @@ dependencies = [

 [[package]]
 name = "libz-sys"
-version = "1.1.8"
+version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9702761c3935f8cc2f101793272e202c72b99da8f4224a19ddcf1279a6450bbf"
+checksum = "6f35facd4a5673cb5a48822be2be1d4236c1c99cb4113cab7061ac720d5bf859"
 dependencies = [
 "cc",
 "libc",
@@ -538,9 +484,9 @@ dependencies = [

 [[package]]
 name = "log"
-version = "0.4.17"
+version = "0.4.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
+checksum = "6389c490849ff5bc16be905ae24bc913a9c8892e19b2341dbc175e14c341c2b8"
 dependencies = [
 "cfg-if",
 ]
@@ -553,14 +499,14 @@ checksum = "0ca88d725a0a943b096803bd34e73a4437208b6077654cc4ecb2947a5f91618d"

 [[package]]
 name = "memchr"
-version = "2.5.0"
+version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"

 [[package]]
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-source = "git+https://github.com/firecracker-microvm/micro-http?branch=main#863b0370ba7e57f7df5b908ada9e5b44809ccae9"
+source = "git+https://github.com/firecracker-microvm/micro-http?branch=main#a730d86940081ad044cdfbc1285c1db6d3048392"
 dependencies = [
 "libc",
 "vmm-sys-util",
@@ -569,7 +515,7 @@ dependencies = [
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 version = "0.1.0"
-source = "git+https://github.com/rust-vmm/mshv?branch=main#a4c9916124d771fb9d0ccd97423ffb72876baa83"
+source = "git+https://github.com/rust-vmm/mshv?branch=main#75cf309d566c3d9ba91e81582a7864032ecc5bbb"
 dependencies = [
 "libc",
 "serde",
@@ -581,7 +527,7 @@ dependencies = [
 [[package]]
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 version = "0.1.0"
-source = "git+https://github.com/rust-vmm/mshv?branch=main#a4c9916124d771fb9d0ccd97423ffb72876baa83"
+source = "git+https://github.com/rust-vmm/mshv?branch=main#75cf309d566c3d9ba91e81582a7864032ecc5bbb"
 dependencies = [
 "libc",
 "mshv-bindings",
@@ -601,16 +547,14 @@ version = "0.1.0"
 dependencies = [
 "epoll",
 "getrandom",
+ "lazy_static",
 "libc",
 "log",
 "net_gen",
- "once_cell",
 "pnet",
- "pnet_datalink",
 "rate_limiter",
 "serde",
 "serde_json",
- "thiserror",
 "versionize",
 "versionize_derive",
 "virtio-bindings",
@@ -620,41 +564,29 @@ dependencies = [
 "vmm-sys-util",
 ]

-[[package]]
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-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43794a0ace135be66a25d3ae77d41b91615fb68ae937f904090203e81f755b65"
-
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
 dependencies = [
 "autocfg",
 ]

-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "074864da206b4973b84eb91683020dbefd6a8c3f0f38e054d93954e891935e4e"
-
 [[package]]
 name = "openssl-src"
-version = "111.22.0+1.1.1q"
+version = "111.18.0+1.1.1n"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f31f0d509d1c1ae9cada2f9539ff8f37933831fd5098879e482aa687d659853"
+checksum = "7897a926e1e8d00219127dc020130eca4292e5ca666dd592480d72c3eca2ff6c"
 dependencies = [
 "cc",
 ]

 [[package]]
 name = "openssl-sys"
-version = "0.9.75"
+version = "0.9.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5f9bd0c2710541a3cda73d6f9ac4f1b240de4ae261065d309dbe73d9dceb42f"
+checksum = "7e46109c383602735fa0a2e48dd2b7c892b048e1bf69e5c3b1d804b7d9c203cb"
 dependencies = [
 "autocfg",
 "cc",
@@ -670,9 +602,12 @@ version = "0.1.0"

 [[package]]
 name = "os_str_bytes"
-version = "6.3.0"
+version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ff7415e9ae3fff1225851df9e0d9e4e5479f947619774677a63572e55e80eff"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]

 [[package]]
 name = "parking_lot"
@@ -701,9 +636,9 @@ dependencies = [

 [[package]]
 name = "paste"
-version = "1.0.8"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9423e2b32f7a043629287a536f21951e8c6a82482d0acb1eeebfc90bc2225b22"
+checksum = "0c520e05135d6e763148b6426a837e239041653ba7becd2e538c076c738025fc"

 [[package]]
 name = "pci"
@@ -715,6 +650,7 @@ dependencies = [
 "libc",
 "log",
 "serde",
+ "serde_derive",
 "thiserror",
 "versionize",
 "versionize_derive",
@@ -735,6 +671,7 @@ dependencies = [
 "clap",
 "dirs",
 "serde",
+ "serde_derive",
 "serde_json",
 "test_infra",
 "thiserror",
@@ -749,30 +686,29 @@ checksum = "1df8c4ec4b0627e53bdf214615ad287367e482558cf84b109250b37464dc03ae"

 [[package]]
 name = "pnet"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0caaf5b11fd907ff15cf14a4477bfabca4b37ab9e447a4f8dead969a59cdafad"
+checksum = "8750e073f82219c01e771133c64718d7685aef922da8a0d430a46aed05b6341a"
 dependencies = [
+ "ipnetwork",
 "pnet_base",
 "pnet_datalink",
 "pnet_packet",
+ "pnet_sys",
 "pnet_transport",
 ]

 [[package]]
 name = "pnet_base"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9d3a993d49e5fd5d4d854d6999d4addca1f72d86c65adf224a36757161c02b6"
-dependencies = [
- "no-std-net",
-]
+checksum = "8205fe084bd43a3af79b3155c19feddd62e733640498842e631a2ffe107d1538"

 [[package]]
 name = "pnet_datalink"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e466faf03a98ad27f6e15cd27a2b7cc89e73e640a43527742977bc503c37f8aa"
+checksum = "6f85aef5e52e22ff06b1b11f2eb6d52959a9e0ecad3cb3f5cc2d78cadc077f0e"
 dependencies = [
 "ipnetwork",
 "libc",
@@ -783,9 +719,9 @@ dependencies = [

 [[package]]
 name = "pnet_macros"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48dd52a5211fac27e7acb14cfc9f30ae16ae0e956b7b779c8214c74559cef4c3"
+checksum = "98cc3af95fed6dc318dfede3e81320f96ad5e237c6f7c4688108b19c8e67432d"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -795,18 +731,18 @@ dependencies = [

 [[package]]
 name = "pnet_macros_support"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89de095dc7739349559913aed1ef6a11e73ceade4897dadc77c5e09de6740750"
+checksum = "feaba58ba96abb218ec584d6caf0d3ff48922df05dbbeb1560553c197091b29e"
 dependencies = [
 "pnet_base",
 ]

 [[package]]
 name = "pnet_packet"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc3b5111e697c39c8b9795b9fdccbc301ab696699e88b9ea5a4e4628978f495f"
+checksum = "f246edaaf1aaf82072d4cd38ee18bcc5dfc0464093f9ca39e4ac5962d68cf9d4"
 dependencies = [
 "glob",
 "pnet_base",
@@ -816,9 +752,9 @@ dependencies = [

 [[package]]
 name = "pnet_sys"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "328e231f0add6d247d82421bf3790b4b33b39c8930637f428eef24c4c6a90805"
+checksum = "028c87a5e3a48fc07df099a2025f2ef16add5993712e1494ba69a6707ee7ed06"
 dependencies = [
 "libc",
 "winapi",
@@ -826,9 +762,9 @@ dependencies = [

 [[package]]
 name = "pnet_transport"
-version = "0.31.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff597185e6f1f5671b3122e4dba892a1c73e17c17e723d7669bd9299cbe7f124"
+checksum = "950f2a7961e19d22e19e84ff0a6e0955013185fe149673499662633d02b41b7a"
 dependencies = [
 "libc",
 "pnet_base",
@@ -838,11 +774,11 @@ dependencies = [

 [[package]]
 name = "proc-macro2"
-version = "1.0.43"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a2ca2c61bc9f3d74d2886294ab7b9853abd9c1ad903a3ac7815c58989bb7bab"
+checksum = "ec757218438d5fda206afc041538b2f6d889286160d649a86a24d37e1235afd1"
 dependencies = [
- "unicode-ident",
+ "unicode-xid",
 ]

 [[package]]
@@ -858,9 +794,9 @@ dependencies = [

 [[package]]
 name = "quote"
-version = "1.0.21"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
+checksum = "a1feb54ed693b93a84e14094943b84b7c4eae204c512b7ccb95ab0c66d278ad1"
 dependencies = [
 "proc-macro2",
 ]
@@ -876,9 +812,9 @@ dependencies = [

 [[package]]
 name = "redox_syscall"
-version = "0.2.16"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
+checksum = "62f25bc4c7e55e0b0b7a1d43fb893f4fa1361d0abe38b9ce4f323c2adfe6ef42"
 dependencies = [
 "bitflags",
 ]
@@ -896,9 +832,9 @@ dependencies = [

 [[package]]
 name = "regex"
-version = "1.6.0"
+version = "1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c4eb3267174b8c6c2f654116623910a0fef09c4753f8dd83db29c48a0df988b"
+checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
 dependencies = [
 "aho-corasick",
 "memchr",
@@ -907,15 +843,15 @@ dependencies = [

 [[package]]
 name = "regex-syntax"
-version = "0.6.27"
+version = "0.6.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3f87b73ce11b1619a3c6332f45341e0047173771e8b8b73f87bfeefb7b56244"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"

 [[package]]
 name = "remain"
-version = "0.2.4"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06df529c0d271b27ac4a2c260f5ce2914b60bd44702cecec7b9f271adbdde23b"
+checksum = "70ba1e78fa68412cb93ef642fd4d20b9a941be49ee9333875ebaf13112673ea7"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -933,9 +869,9 @@ dependencies = [

 [[package]]
 name = "ryu"
-version = "1.0.11"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
+checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"

 [[package]]
 name = "scopeguard"
@@ -954,24 +890,21 @@ dependencies = [

 [[package]]
 name = "semver"
-version = "1.0.13"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93f6841e709003d68bb2deee8c343572bf446003ec20a583e76f7b15cebf3711"
+checksum = "d65bd28f48be7196d222d95b9243287f48d27aca604e08497513019ff0502cc4"

 [[package]]
 name = "serde"
-version = "1.0.143"
+version = "1.0.136"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e8e5d5b70924f74ff5c6d64d9a5acd91422117c60f48c4e07855238a254553"
-dependencies = [
- "serde_derive",
-]
+checksum = "ce31e24b01e1e524df96f1c2fdd054405f8d7376249a5110886fb4b658484789"

 [[package]]
 name = "serde_derive"
-version = "1.0.143"
+version = "1.0.136"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3d8e8de557aee63c26b85b947f5e59b690d0454c753f3adeb5cd7835ab88391"
+checksum = "08597e7152fcd306f41838ed3e37be9eaeed2b61c42e2117266a554fab4662f9"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -980,42 +913,20 @@ dependencies = [

 [[package]]
 name = "serde_json"
-version = "1.0.83"
+version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38dd04e3c8279e75b31ef29dbdceebfe5ad89f4d0937213c53f7d49d01b3d5a7"
+checksum = "8e8d9fa5c3b304765ce1fd9c4c8a3de2c8db365a5b91be52f186efc675681d95"
 dependencies = [
 "itoa",
 "ryu",
 "serde",
 ]

-[[package]]
-name = "serde_with"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89df7a26519371a3cce44fbb914c2819c84d9b897890987fa3ab096491cc0ea8"
-dependencies = [
- "serde",
- "serde_with_macros",
-]
-
-[[package]]
-name = "serde_with_macros"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de337f322382fcdfbb21a014f7c224ee041a23785651db67b9827403178f698f"
-dependencies = [
- "darling",
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "signal-hook"
-version = "0.3.14"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a253b5e89e2698464fc26b545c9edceb338e18a89effeeecfea192c3025be29d"
+checksum = "647c97df271007dcea485bb74ffdb57f2e683f1306c854f468a0c244badabf2d"
 dependencies = [
 "libc",
 "signal-hook-registry",
@@ -1032,9 +943,9 @@ dependencies = [

 [[package]]
 name = "smallvec"
-version = "1.9.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fd0db749597d91ff862fd1d55ea87f7855a744a8425a64695b6fca237d1dad1"
+checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"

 [[package]]
 name = "ssh2"
@@ -1062,13 +973,13 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"

 [[package]]
 name = "syn"
-version = "1.0.99"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58dbef6ec655055e20b86b15a8cc6d439cca19b667537ac6a1369572d151ab13"
+checksum = "b683b2b825c8eef438b77c36a06dc262294da3d5a5813fac20da149241dcd44d"
 dependencies = [
 "proc-macro2",
 "quote",
- "unicode-ident",
+ "unicode-xid",
 ]

 [[package]]
@@ -1108,8 +1019,8 @@ version = "0.1.0"
 dependencies = [
 "dirs",
 "epoll",
+ "lazy_static",
 "libc",
- "once_cell",
 "ssh2",
 "vmm-sys-util",
 "wait-timeout",
@@ -1126,41 +1037,35 @@ dependencies = [

 [[package]]
 name = "thiserror"
-version = "1.0.32"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f5f6586b7f764adc0231f4c79be7b920e766bb2f3e51b3661cdb263828f19994"
+checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417"
 dependencies = [
 "thiserror-impl",
 ]

 [[package]]
 name = "thiserror-impl"
-version = "1.0.32"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12bafc5b54507e0149cdf1b145a5d80ab80a90bcd9275df43d4fff68460f6c21"
+checksum = "aa32fd3f627f367fe16f893e2597ae3c05020f8bba2666a4e6ea73d377e5714b"
 dependencies = [
 "proc-macro2",
 "quote",
 "syn",
 ]

-[[package]]
-name = "unicode-ident"
-version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"
-
 [[package]]
 name = "unicode-xid"
-version = "0.2.3"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "957e51f3646910546462e67d5f7599b9e4fb8acdd304b087a6494730f9eebf04"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

 [[package]]
 name = "uuid"
-version = "1.1.2"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd6469f4314d5f1ffec476e05f17cc9a78bc7a27a6a857842170bdf8d6f98d2f"
+checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
 dependencies = [
 "getrandom",
 ]
@@ -1210,7 +1115,7 @@ dependencies = [
 [[package]]
 name = "vfio-ioctls"
 version = "0.1.0"
-source = "git+https://github.com/rust-vmm/vfio?branch=main#c52e88ac551183bd3784745a7143db45abdb05db"
+source = "git+https://github.com/rust-vmm/vfio?branch=main#f75a77c1ab6349c105bc1462a65508726b4c2e0f"
 dependencies = [
 "byteorder",
 "kvm-bindings",
@@ -1229,6 +1134,7 @@ dependencies = [
 name = "vfio_user"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
 "libc",
 "log",
 "serde",
@@ -1251,6 +1157,7 @@ dependencies = [
 "remain",
 "thiserror",
 "uuid",
+ "vmm-sys-util",
 ]

 [[package]]
@@ -1267,9 +1174,9 @@ dependencies = [

 [[package]]
 name = "vhost-user-backend"
-version = "0.6.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "558ac5ca9569fb03f518b2bdd17606809ffdc894b619b92d30df6c40c33d15f3"
+checksum = "1490f2028d4f119b2292efe218b5f8cfc6471f039b53b6a6eb5d9513e964facc"
 dependencies = [
 "libc",
 "log",
@@ -1295,7 +1202,6 @@ dependencies = [
 "vhost",
 "vhost-user-backend",
 "virtio-bindings",
- "virtio-queue",
 "vm-memory",
 "vmm-sys-util",
 ]
@@ -1343,6 +1249,7 @@ dependencies = [
 "rate_limiter",
 "seccompiler",
 "serde",
+ "serde_derive",
 "serde_json",
 "thiserror",
 "versionize",
@@ -1360,12 +1267,11 @@ dependencies = [

 [[package]]
 name = "virtio-queue"
-version = "0.5.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4f59652909f276e6edd8bf36e9f106480b2202f5f046717b3de14f1b4072a28"
+checksum = "3785325315e6496fa88673842ee6cd198b9658e88e8b0e1ad48a5dc818b221dc"
 dependencies = [
 "log",
- "virtio-bindings",
 "vm-memory",
 "vmm-sys-util",
 ]
@@ -1384,8 +1290,9 @@ name = "vm-device"
 version = "0.1.0"
 dependencies = [
 "anyhow",
- "hypervisor",
 "serde",
+ "serde_derive",
+ "serde_json",
 "thiserror",
 "vfio-ioctls",
 "vm-memory",
@@ -1399,9 +1306,9 @@ source = "git+https://github.com/rust-vmm/vm-fdt?branch=main#ca35d96191f8232bd7a

 [[package]]
 name = "vm-memory"
-version = "0.8.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "767ed8aaebbff902e02e6d3749dc2baef55e46565f8a6414a065e5baee4b4a81"
+checksum = "339d4349c126fdcd87e034631d7274370cf19eb0e87b33166bcd956589fc72c5"
 dependencies = [
 "arc-swap",
 "libc",
@@ -1414,6 +1321,7 @@ version = "0.1.0"
 dependencies = [
 "anyhow",
 "serde",
+ "serde_derive",
 "serde_json",
 "thiserror",
 "versionize",
@@ -1426,6 +1334,7 @@ name = "vm-virtio"
 version = "0.1.0"
 dependencies = [
 "log",
+ "virtio-bindings",
 "virtio-queue",
 "vm-memory",
 ]
@@ -1447,17 +1356,18 @@ dependencies = [
 "gdbstub",
 "gdbstub_arch",
 "hypervisor",
+ "lazy_static",
 "libc",
 "linux-loader",
 "log",
 "micro_http",
 "net_util",
- "once_cell",
 "option_parser",
 "pci",
 "qcow",
 "seccompiler",
 "serde",
+ "serde_derive",
 "serde_json",
 "signal-hook",
 "thiserror",
@@ -1479,9 +1389,9 @@ dependencies = [

 [[package]]
 name = "vmm-sys-util"
-version = "0.10.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08604d7be03eb26e33b3cee3ed4aef2bf550b305d1cca60e84da5d28d3790b62"
+checksum = "733537bded03aaa93543f785ae997727b30d1d9f4a03b7861d23290474242e11"
 dependencies = [
 "bitflags",
 "libc",
@@ -1500,9 +1410,9 @@ dependencies = [

 [[package]]
 name = "wasi"
-version = "0.11.0+wasi-snapshot-preview1"
+version = "0.10.2+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"

 [[package]]
 name = "winapi"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cloud-hypervisor"
-version = "26.0.0"
+version = "23.1.0"
 authors = ["The Cloud Hypervisor Authors"]
 edition = "2021"
 default-run = "cloud-hypervisor"
@@ -10,31 +10,31 @@ description = "Open source Virtual Machine Monitor (VMM) that runs on top of KVM
 homepage = "https://github.com/cloud-hypervisor/cloud-hypervisor"
 # Minimum buildable version:
 # Keep in sync with version in .github/workflows/build.yaml
-rust-version = "1.60"
+rust-version = "1.56"

 [profile.release]
 lto = true

 [dependencies]
-anyhow = "1.0.62"
+anyhow = "1.0.56"
 api_client = { path = "api_client" }
-clap = { version = "3.2.17", features = ["wrap_help","cargo"] }
+clap = { version = "3.1.8", features = ["wrap_help","cargo"] }
 epoll = "4.3.1"
 event_monitor = { path = "event_monitor" }
 hypervisor = { path = "hypervisor" }
-libc = "0.2.131"
-log = { version = "0.4.17", features = ["std"] }
+libc = "0.2.123"
+log = { version = "0.4.16", features = ["std"] }
 option_parser = { path = "option_parser" }
 seccompiler = "0.2.0"
-serde_json = "1.0.83"
-signal-hook = "0.3.14"
-thiserror = "1.0.32"
+serde_json = "1.0.79"
+signal-hook = "0.3.13"
+thiserror = "1.0.30"
 vmm = { path = "vmm" }
-vmm-sys-util = "0.10.0"
-vm-memory = "0.8.0"
+vmm-sys-util = "0.9.0"
+vm-memory = "0.7.0"

 [build-dependencies]
-clap = { version = "3.2.17", features = ["cargo"] }
+clap = { version = "3.1.8", features = ["cargo"] }

 # List of patched crates
 [patch.crates-io]
@@ -44,9 +44,9 @@ versionize_derive = { git = "https://github.com/cloud-hypervisor/versionize_deri

 [dev-dependencies]
 dirs = "4.0.0"
+lazy_static= "1.4.0"
 net_util = { path = "net_util" }
-once_cell = "1.13.1"
-serde_json = "1.0.83"
+serde_json = "1.0.79"
 test_infra = { path = "test_infra" }
 wait-timeout = "0.2.0"

@@ -58,7 +58,6 @@ amx = ["vmm/amx"]
 cmos = ["vmm/cmos"]
 fwdebug = ["vmm/fwdebug"]
 gdb = ["vmm/gdb"]
-guest_debug = ["vmm/guest_debug"]
 kvm = ["vmm/kvm"]
 mshv = ["vmm/mshv"]
 tdx = ["vmm/tdx"]
--- a/77
+++ b/77
@@ -23,19 +23,6 @@ pipeline{
 						}
 					}
 				}
-				stage ('Check for fuzzer files only changes') {
-					when {
-						expression {
-							return fuzzFileOnly()
-						}
-					}
-					steps {
-						script {
-							runWorkers = false
-							echo "Fuzzer cargo files only changes, no need to run the CI"
-						}
-					}
-				}
 				stage ('Check for RFC/WIP builds') {
 					when {
  						changeRequest comparator: 'REGEXP', title: '.*(rfc|RFC|wip|WIP).*'
@@ -56,7 +43,7 @@ pipeline{
 		stage ('Build') {
 			parallel {
 				stage ('Worker build') {
-					agent { node { label 'jammy' } }
+					agent { node { label 'focal' } }
 					when {
 						beforeAgent true
 						expression {
@@ -103,9 +90,6 @@ pipeline{
 							return runWorkers
 						}
 					}
-					environment {
-        					AZURE_CONNECTION_STRING = credentials('46b4e7d6-315f-4cc1-8333-b58780863b9b')
-					}
 					stages {
 						stage ('Checkout') {
 							steps {
@@ -126,42 +110,6 @@ pipeline{
 								sh "scripts/dev_cli.sh tests --integration --libc musl"
 							}
 						}
-						stage ('Install azure-cli') {
-							steps {
-								installAzureCli("bionic", "arm64")
-							}
-						}
-						stage ('Download Windows image') {
-							steps {
-								sh '''#!/bin/bash -x
-									IMG_BASENAME=windows-11-iot-enterprise-aarch64.raw
-									IMG_PATH=$HOME/workloads/$IMG_BASENAME
-									IMG_GZ_PATH=$HOME/workloads/$IMG_BASENAME.gz
-									IMG_GZ_BLOB_NAME=windows-11-iot-enterprise-aarch64-9-min.raw.gz
-									cp "scripts/$IMG_BASENAME.sha1" "$HOME/workloads/"
-									pushd "$HOME/workloads"
-									if sha1sum "$IMG_BASENAME.sha1" --check; then
-										exit
-									fi
-									popd
-									mkdir -p "$HOME/workloads"
-									az storage blob download \
-										--container-name private-images \
-										--file "$IMG_GZ_PATH" \
-										--name "$IMG_GZ_BLOB_NAME" \
-										--connection-string "$AZURE_CONNECTION_STRING"
-									gzip -d $IMG_GZ_PATH
-								'''
-							}
-						}
-						stage ('Run Windows guest integration tests') {
-							options {
-								timeout(time: 1, unit: 'HOURS')
-							}
-							steps {
-								sh "scripts/dev_cli.sh tests --integration-windows --libc musl"
-							}
-						}
 					}
 					post {
 						always {
@@ -171,7 +119,7 @@ pipeline{
 					}
 				}
 				stage ('Worker build (musl)') {
-					agent { node { label 'jammy' } }
+					agent { node { label 'focal' } }
 					when {
 						beforeAgent true
 						expression {
@@ -288,7 +236,7 @@ pipeline{
 					}
 				}
 				stage ('Worker build - Windows guest') {
-					agent { node { label 'jammy' } }
+					agent { node { label 'focal' } }
 					when {
 						beforeAgent true
 						expression {
@@ -306,7 +254,7 @@ pipeline{
 						}
 						stage ('Install azure-cli') {
 							steps {
-								installAzureCli("jammy", "amd64")
+								installAzureCli()
 							}
 						}
 						stage ('Download assets') {
@@ -334,7 +282,7 @@ pipeline{
 					}
 				}
 				stage ('Worker build - Live Migration') {
-					agent { node { label 'jammy' } }
+					agent { node { label 'focal-small' } }
 					when {
 						beforeAgent true
 						expression {
@@ -436,10 +384,10 @@ def cancelPreviousBuilds() {
 		}
 }

-def installAzureCli(distro, arch) {
+def installAzureCli() {
 	sh "sudo apt install -y ca-certificates curl apt-transport-https lsb-release gnupg"
 	sh "curl -sL https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/microsoft.gpg > /dev/null"
-	sh "echo \"deb [arch=${arch}] https://packages.microsoft.com/repos/azure-cli/ ${distro} main\" | sudo tee /etc/apt/sources.list.d/azure-cli.list"
+	sh "echo \"deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ focal main\" | sudo tee /etc/apt/sources.list.d/azure-cli.list"
 	sh "sudo apt update"
 	sh "sudo apt install -y azure-cli"
 }
@@ -454,14 +402,3 @@ def boolean docsFileOnly() {
        script: "git diff --name-only origin/${env.CHANGE_TARGET}... | grep -v '\\.md'"
    ) != 0
 }
-
-def boolean fuzzFileOnly() {
-    if (env.CHANGE_TARGET == null) {
-        return false;
-    }
-
-    return sh(
-        returnStatus: true,
-        script: "git diff --name-only origin/${env.CHANGE_TARGET}... | grep -v -E 'fuzz/'"
-    ) != 0
-}
--- a/README.md
+++ b/README.md
@@ -88,10 +88,12 @@ Hypervisor. Here, all the steps are based on Ubuntu, for other Linux
 distributions please replace the package manager and package name.

 ```shell
-# Install build-essential, git, and qemu-utils
-$ sudo apt install git build-essential qemu-utils
+# Install git
+$ sudo apt install git
 # Install rust tool chain
 $ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+# Install build-essential
+$ sudo apt install build-essential
 # If you want to build statically linked binary please add musl target
 $ rustup target add x86_64-unknown-linux-musl
 ```
@@ -166,7 +168,7 @@ cloud image. Here we will use a Ubuntu image:
 $ pushd $CLOUDH
 $ wget https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img
 $ qemu-img convert -p -f qcow2 -O raw focal-server-cloudimg-amd64.img focal-server-cloudimg-amd64.raw
-$ wget https://github.com/cloud-hypervisor/rust-hypervisor-firmware/releases/download/0.4.1/hypervisor-fw
+$ wget https://github.com/cloud-hypervisor/rust-hypervisor-firmware/releases/download/0.3.2/hypervisor-fw
 $ popd
 ```

@@ -289,8 +291,6 @@ As of 2022-04-05, the following cloud images are supported:
 Direct kernel boot to userspace should work with a rootfs from most
 distributions.

-Further details can be found in the [release documentation](docs/releases.md).
-
 ## Hot Plug

 Cloud Hypervisor supports hotplug of CPUs, passthrough devices (VFIO),
--- a/acpi_tables/Cargo.toml
+++ b/acpi_tables/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2021"

 [dependencies]
-vm-memory = "0.8.0"
+vm-memory = "0.7.0"
--- a/acpi_tables/src/aml.rs
+++ b/acpi_tables/src/aml.rs
@@ -68,7 +68,7 @@ impl Aml for Path {
        };

        for part in self.name_parts.clone().iter_mut() {
-            bytes.extend_from_slice(part.as_ref());
+            bytes.extend_from_slice(&part.to_vec());
        }
    }
 }
--- a/acpi_tables/src/sdt.rs
+++ b/acpi_tables/src/sdt.rs
@@ -4,7 +4,6 @@
 //

 #[repr(packed)]
-#[derive(Clone, Copy)]
 pub struct GenericAddress {
    pub address_space_id: u8,
    pub register_bit_width: u8,
--- a/api_client/Cargo.toml
+++ b/api_client/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2021"

 [dependencies]
-vmm-sys-util = "0.10.0"
+vmm-sys-util = "0.9.0"
--- a/api_client/src/lib.rs
+++ b/api_client/src/lib.rs
@@ -101,10 +101,6 @@ fn parse_http_response(socket: &mut dyn Read) -> Result<Option<String>, Error> {
    loop {
        let mut bytes = vec![0; 256];
        let count = socket.read(&mut bytes).map_err(Error::Socket)?;
-        // If the return value is 0, the peer has performed an orderly shutdown.
-        if count == 0 {
-            break;
-        }
        res.push_str(std::str::from_utf8(&bytes[0..count]).unwrap());

        // End of headers
@@ -131,7 +127,7 @@ fn parse_http_response(socket: &mut dyn Read) -> Result<Option<String>, Error> {
            }
        }
    }
-    let body_string = content_length.and(body_offset.map(|o| String::from(&res[o..])));
+    let body_string = content_length.and(Some(String::from(&res[body_offset.unwrap()..])));
    let status_code = get_status_code(&res)?;

    if status_code.is_server_error() {
--- a/arch/Cargo.toml
+++ b/arch/Cargo.toml
@@ -9,21 +9,22 @@ default = []
 tdx = []

 [dependencies]
-anyhow = "1.0.62"
+acpi_tables = { path = "../acpi_tables" }
+anyhow = "1.0.56"
 byteorder = "1.4.3"
 hypervisor = { path = "../hypervisor" }
-libc = "0.2.131"
+libc = "0.2.123"
 linux-loader = { version = "0.4.0", features = ["elf", "bzimage", "pe"] }
-log = "0.4.17"
-serde = { version = "1.0.143", features = ["rc", "derive"] }
-thiserror = "1.0.32"
-uuid = "1.1.2"
+log = "0.4.16"
+serde = { version = "1.0.136", features = ["rc"] }
+serde_derive = "1.0.136"
+thiserror = "1.0.30"
 versionize = "0.1.6"
 versionize_derive = "0.1.4"
-vm-memory = { version = "0.8.0", features = ["backend-mmap", "backend-bitmap"] }
+vm-memory = { version = "0.7.0", features = ["backend-mmap", "backend-bitmap"] }
 vm-migration = { path = "../vm-migration" }
-vmm-sys-util = { version = "0.10.0", features = ["with-serde"] }
+vmm-sys-util = { version = "0.9.0", features = ["with-serde"] }

 [target.'cfg(target_arch = "aarch64")'.dependencies]
-fdt_parser = { version = "0.1.4", package = "fdt" }
+fdt_parser = { version = "0.1.3", package = 'fdt'}
 vm-fdt = { git = "https://github.com/rust-vmm/vm-fdt", branch = "main" }
--- a/arch/src/aarch64/fdt.rs
+++ b/arch/src/aarch64/fdt.rs
@@ -8,18 +8,17 @@

 use crate::{NumaNodes, PciSpaceInfo};
 use byteorder::{BigEndian, ByteOrder};
-use hypervisor::arch::aarch64::gic::Vgic;
 use std::cmp;
 use std::collections::HashMap;
 use std::ffi::CStr;
 use std::fmt::Debug;
 use std::result;
 use std::str;
-use std::sync::{Arc, Mutex};

 use super::super::DeviceType;
 use super::super::GuestMemoryMmap;
 use super::super::InitramfsConfig;
+use super::gic::GicDevice;
 use super::layout::{
    IRQ_BASE, MEM_32BIT_DEVICES_SIZE, MEM_32BIT_DEVICES_START, MEM_PCI_IO_SIZE, MEM_PCI_IO_START,
    PCI_HIGH_BASE, PCI_MMIO_CONFIG_SIZE_PER_SEGMENT,
@@ -91,7 +90,7 @@ pub fn create_fdt<T: DeviceInfoForFdt + Clone + Debug, S: ::std::hash::BuildHash
    vcpu_mpidr: Vec<u64>,
    vcpu_topology: Option<(u8, u8, u8)>,
    device_info: &HashMap<(DeviceType, String), T, S>,
-    gic_device: &Arc<Mutex<dyn Vgic>>,
+    gic_device: &dyn GicDevice,
    initrd: &Option<InitramfsConfig>,
    pci_space_info: &[PciSpaceInfo],
    numa_nodes: &NumaNodes,
@@ -316,18 +315,18 @@ fn create_chosen_node(
    Ok(())
 }

-fn create_gic_node(fdt: &mut FdtWriter, gic_device: &Arc<Mutex<dyn Vgic>>) -> FdtWriterResult<()> {
-    let gic_reg_prop = gic_device.lock().unwrap().device_properties();
+fn create_gic_node(fdt: &mut FdtWriter, gic_device: &dyn GicDevice) -> FdtWriterResult<()> {
+    let gic_reg_prop = gic_device.device_properties();

    let intc_node = fdt.begin_node("intc")?;

-    fdt.property_string("compatible", gic_device.lock().unwrap().fdt_compatibility())?;
+    fdt.property_string("compatible", gic_device.fdt_compatibility())?;
    fdt.property_null("interrupt-controller")?;
    // "interrupt-cells" field specifies the number of cells needed to encode an
    // interrupt source. The type shall be a <u32> and the value shall be 3 if no PPI affinity description
    // is required.
    fdt.property_u32("#interrupt-cells", 3)?;
-    fdt.property_array_u64("reg", &gic_reg_prop)?;
+    fdt.property_array_u64("reg", gic_reg_prop)?;
    fdt.property_u32("phandle", GIC_PHANDLE)?;
    fdt.property_u32("#address-cells", 2)?;
    fdt.property_u32("#size-cells", 2)?;
@@ -335,18 +334,18 @@ fn create_gic_node(fdt: &mut FdtWriter, gic_device: &Arc<Mutex<dyn Vgic>>) -> Fd

    let gic_intr_prop = [
        GIC_FDT_IRQ_TYPE_PPI,
-        gic_device.lock().unwrap().fdt_maint_irq(),
+        gic_device.fdt_maint_irq(),
        IRQ_TYPE_LEVEL_HI,
    ];
    fdt.property_array_u32("interrupts", &gic_intr_prop)?;

-    if gic_device.lock().unwrap().msi_compatible() {
+    if gic_device.msi_compatible() {
        let msic_node = fdt.begin_node("msic")?;
-        fdt.property_string("compatible", gic_device.lock().unwrap().msi_compatibility())?;
+        fdt.property_string("compatible", gic_device.msi_compatibility())?;
        fdt.property_null("msi-controller")?;
        fdt.property_u32("phandle", MSI_PHANDLE)?;
-        let msi_reg_prop = gic_device.lock().unwrap().msi_properties();
-        fdt.property_array_u64("reg", &msi_reg_prop)?;
+        let msi_reg_prop = gic_device.msi_properties();
+        fdt.property_array_u64("reg", msi_reg_prop)?;
        fdt.end_node(msic_node)?;
    }

--- a/hypervisor/src/kvm/aarch64/gic/dist_regs.rs
+++ b/hypervisor/src/kvm/aarch64/gic/dist_regs.rs
@@ -1,12 +1,12 @@
 // Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0

-use crate::arch::aarch64::gic::{Error, Result};
-use crate::device::HypervisorDeviceError;
-use crate::kvm::kvm_bindings::{
+use super::{Error, Result};
+use crate::layout::IRQ_BASE;
+use hypervisor::kvm::kvm_bindings::{
    kvm_device_attr, KVM_DEV_ARM_VGIC_GRP_DIST_REGS, KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
 };
-use kvm_ioctls::DeviceFd;
+use std::sync::Arc;

 /*
 Distributor registers as detailed at page 456 from
@@ -77,7 +77,12 @@ static VGIC_DIST_REGS: &[DistReg] = &[
    VGIC_DIST_REG!(GICD_IPRIORITYR, 8, 0),
 ];

-fn dist_attr_access(gic: &DeviceFd, offset: u32, val: &u32, set: bool) -> Result<()> {
+fn dist_attr_access(
+    gic: &Arc<dyn hypervisor::Device>,
+    offset: u32,
+    val: &u32,
+    set: bool,
+) -> Result<()> {
    let mut gic_dist_attr = kvm_device_attr {
        group: KVM_DEV_ARM_VGIC_GRP_DIST_REGS,
        attr: offset as u64,
@@ -85,30 +90,28 @@ fn dist_attr_access(gic: &DeviceFd, offset: u32, val: &u32, set: bool) -> Result
        flags: 0,
    };
    if set {
-        gic.set_device_attr(&gic_dist_attr).map_err(|e| {
-            Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into()))
-        })?;
+        gic.set_device_attr(&gic_dist_attr)
+            .map_err(Error::SetDeviceAttribute)?;
    } else {
-        gic.get_device_attr(&mut gic_dist_attr).map_err(|e| {
-            Error::GetDeviceAttribute(HypervisorDeviceError::GetDeviceAttribute(e.into()))
-        })?;
+        gic.get_device_attr(&mut gic_dist_attr)
+            .map_err(Error::GetDeviceAttribute)?;
    }
    Ok(())
 }

 /// Get the distributor control register.
-pub fn read_ctlr(gic: &DeviceFd) -> Result<u32> {
+pub fn read_ctlr(gic: &Arc<dyn hypervisor::Device>) -> Result<u32> {
    let val: u32 = 0;
    dist_attr_access(gic, GICD_CTLR, &val, false)?;
    Ok(val)
 }

 /// Set the distributor control register.
-pub fn write_ctlr(gic: &DeviceFd, val: u32) -> Result<()> {
+pub fn write_ctlr(gic: &Arc<dyn hypervisor::Device>, val: u32) -> Result<()> {
    dist_attr_access(gic, GICD_CTLR, &val, true)
 }

-fn get_interrupts_num(gic: &DeviceFd) -> Result<u32> {
+fn get_interrupts_num(gic: &Arc<dyn hypervisor::Device>) -> Result<u32> {
    let num_irq = 0;

    let mut nr_irqs_attr = kvm_device_attr {
@@ -117,18 +120,12 @@ fn get_interrupts_num(gic: &DeviceFd) -> Result<u32> {
        addr: &num_irq as *const u32 as u64,
        flags: 0,
    };
-    gic.get_device_attr(&mut nr_irqs_attr).map_err(|e| {
-        Error::GetDeviceAttribute(HypervisorDeviceError::GetDeviceAttribute(e.into()))
-    })?;
+    gic.get_device_attr(&mut nr_irqs_attr)
+        .map_err(Error::GetDeviceAttribute)?;
    Ok(num_irq)
 }

-fn compute_reg_len(gic: &DeviceFd, reg: &DistReg, base: u32) -> Result<u32> {
-    // FIXME:
-    // Redefine some GIC constants to avoid the dependency on `layout` crate.
-    // This is temporary solution, will be fixed in future refactoring.
-    const LAYOUT_IRQ_BASE: u32 = 32;
-
+fn compute_reg_len(gic: &Arc<dyn hypervisor::Device>, reg: &DistReg, base: u32) -> Result<u32> {
    let mut end = base;
    let num_irq = get_interrupts_num(gic)?;
    if reg.length > 0 {
@@ -141,8 +138,8 @@ fn compute_reg_len(gic: &DeviceFd, reg: &DistReg, base: u32) -> Result<u32> {
        // This is the type of register that takes into account the number of interrupts
        // that the model has. It is also the type of register where
        // a register relates to multiple interrupts.
-        end = base + (reg.bpi as u32 * (num_irq - LAYOUT_IRQ_BASE) / 8);
-        if reg.bpi as u32 * (num_irq - LAYOUT_IRQ_BASE) % 8 > 0 {
+        end = base + (reg.bpi as u32 * (num_irq - IRQ_BASE) / 8);
+        if reg.bpi as u32 * (num_irq - IRQ_BASE) % 8 > 0 {
            end += REG_SIZE as u32;
        }
    }
@@ -150,7 +147,7 @@ fn compute_reg_len(gic: &DeviceFd, reg: &DistReg, base: u32) -> Result<u32> {
 }

 /// Set distributor registers of the GIC.
-pub fn set_dist_regs(gic: &DeviceFd, state: &[u32]) -> Result<()> {
+pub fn set_dist_regs(gic: &Arc<dyn hypervisor::Device>, state: &[u32]) -> Result<()> {
    let mut idx = 0;

    for dreg in VGIC_DIST_REGS {
@@ -167,7 +164,7 @@ pub fn set_dist_regs(gic: &DeviceFd, state: &[u32]) -> Result<()> {
    Ok(())
 }
 /// Get distributor registers of the GIC.
-pub fn get_dist_regs(gic: &DeviceFd) -> Result<Vec<u32>> {
+pub fn get_dist_regs(gic: &Arc<dyn hypervisor::Device>) -> Result<Vec<u32>> {
    let mut state = Vec::new();

    for dreg in VGIC_DIST_REGS {
--- a/arch/src/aarch64/gic/gicv3.rs
+++ b/arch/src/aarch64/gic/gicv3.rs
@@ -0,0 +1,262 @@
+// Copyright 2021 Arm Limited (or its affiliates). All rights reserved.
+// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+//
+// This file implements the GicV3 device.
+
+pub mod kvm {
+    use crate::aarch64::gic::dist_regs::{get_dist_regs, read_ctlr, set_dist_regs, write_ctlr};
+    use crate::aarch64::gic::icc_regs::{get_icc_regs, set_icc_regs};
+    use crate::aarch64::gic::kvm::{save_pending_tables, KvmGicDevice};
+    use crate::aarch64::gic::redist_regs::{
+        construct_gicr_typers, get_redist_regs, set_redist_regs,
+    };
+    use crate::aarch64::gic::GicDevice;
+    use crate::layout;
+    use anyhow::anyhow;
+    use hypervisor::kvm::kvm_bindings;
+    use hypervisor::CpuState;
+    use std::any::Any;
+    use std::convert::TryInto;
+    use std::sync::Arc;
+    use std::{boxed::Box, result};
+    use versionize::{VersionMap, Versionize, VersionizeResult};
+    use versionize_derive::Versionize;
+    use vm_memory::Address;
+    use vm_migration::{
+        Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable,
+        VersionMapped,
+    };
+
+    /// Errors thrown while saving/restoring the GICv3.
+    #[derive(Debug)]
+    pub enum Error {
+        /// Error in saving RDIST pending tables into guest RAM.
+        SavePendingTables(crate::aarch64::gic::Error),
+        /// Error in saving GIC distributor registers.
+        SaveDistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC distributor registers.
+        RestoreDistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GIC distributor control registers.
+        SaveDistributorCtrlRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC distributor control registers.
+        RestoreDistributorCtrlRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GIC redistributor registers.
+        SaveRedistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC redistributor registers.
+        RestoreRedistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GIC CPU interface registers.
+        SaveIccRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC CPU interface registers.
+        RestoreIccRegisters(crate::aarch64::gic::Error),
+    }
+
+    type Result<T> = result::Result<T, Error>;
+
+    pub struct KvmGicV3 {
+        /// The hypervisor agnostic device for the GicV3
+        device: Arc<dyn hypervisor::Device>,
+
+        /// Vector holding values of GICR_TYPER for each vCPU
+        gicr_typers: Vec<u64>,
+
+        /// GIC device properties, to be used for setting up the fdt entry
+        properties: [u64; 4],
+
+        /// Number of CPUs handled by the device
+        vcpu_count: u64,
+    }
+
+    #[derive(Versionize)]
+    pub struct Gicv3State {
+        dist: Vec<u32>,
+        rdist: Vec<u32>,
+        icc: Vec<u32>,
+        // special register that enables interrupts and affinity routing
+        gicd_ctlr: u32,
+    }
+
+    impl VersionMapped for Gicv3State {}
+
+    impl KvmGicV3 {
+        // Device trees specific constants
+        pub const ARCH_GIC_V3_MAINT_IRQ: u32 = 9;
+
+        /// Get the address of the GIC distributor.
+        pub fn get_dist_addr() -> u64 {
+            layout::GIC_V3_DIST_START.raw_value()
+        }
+
+        /// Get the size of the GIC distributor.
+        pub fn get_dist_size() -> u64 {
+            layout::GIC_V3_DIST_SIZE
+        }
+
+        /// Get the address of the GIC redistributors.
+        pub fn get_redists_addr(vcpu_count: u64) -> u64 {
+            KvmGicV3::get_dist_addr() - KvmGicV3::get_redists_size(vcpu_count)
+        }
+
+        /// Get the size of the GIC redistributors.
+        pub fn get_redists_size(vcpu_count: u64) -> u64 {
+            vcpu_count * layout::GIC_V3_REDIST_SIZE
+        }
+
+        /// Save the state of GIC.
+        fn state(&self, gicr_typers: &[u64]) -> Result<Gicv3State> {
+            let gicd_ctlr =
+                read_ctlr(self.device()).map_err(Error::SaveDistributorCtrlRegisters)?;
+
+            let dist_state =
+                get_dist_regs(self.device()).map_err(Error::SaveDistributorRegisters)?;
+
+            let rdist_state = get_redist_regs(self.device(), gicr_typers)
+                .map_err(Error::SaveRedistributorRegisters)?;
+
+            let icc_state =
+                get_icc_regs(self.device(), gicr_typers).map_err(Error::SaveIccRegisters)?;
+
+            Ok(Gicv3State {
+                dist: dist_state,
+                rdist: rdist_state,
+                icc: icc_state,
+                gicd_ctlr,
+            })
+        }
+
+        /// Restore the state of GIC.
+        fn set_state(&mut self, gicr_typers: &[u64], state: &Gicv3State) -> Result<()> {
+            write_ctlr(self.device(), state.gicd_ctlr)
+                .map_err(Error::RestoreDistributorCtrlRegisters)?;
+
+            set_dist_regs(self.device(), &state.dist)
+                .map_err(Error::RestoreDistributorRegisters)?;
+
+            set_redist_regs(self.device(), gicr_typers, &state.rdist)
+                .map_err(Error::RestoreRedistributorRegisters)?;
+
+            set_icc_regs(self.device(), gicr_typers, &state.icc)
+                .map_err(Error::RestoreIccRegisters)?;
+
+            Ok(())
+        }
+    }
+
+    impl GicDevice for KvmGicV3 {
+        fn device(&self) -> &Arc<dyn hypervisor::Device> {
+            &self.device
+        }
+
+        fn fdt_compatibility(&self) -> &str {
+            "arm,gic-v3"
+        }
+
+        fn fdt_maint_irq(&self) -> u32 {
+            KvmGicV3::ARCH_GIC_V3_MAINT_IRQ
+        }
+
+        fn device_properties(&self) -> &[u64] {
+            &self.properties
+        }
+
+        fn vcpu_count(&self) -> u64 {
+            self.vcpu_count
+        }
+
+        fn set_its_device(&mut self, _its_device: Option<Arc<dyn hypervisor::Device>>) {}
+
+        fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]) {
+            let gicr_typers = construct_gicr_typers(vcpu_states);
+            self.gicr_typers = gicr_typers;
+        }
+
+        fn as_any_concrete_mut(&mut self) -> &mut dyn Any {
+            self
+        }
+    }
+
+    impl KvmGicDevice for KvmGicV3 {
+        fn version() -> u32 {
+            kvm_bindings::kvm_device_type_KVM_DEV_TYPE_ARM_VGIC_V3
+        }
+
+        fn create_device(
+            device: Arc<dyn hypervisor::Device>,
+            vcpu_count: u64,
+        ) -> Box<dyn GicDevice> {
+            Box::new(KvmGicV3 {
+                device,
+                gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
+                properties: [
+                    KvmGicV3::get_dist_addr(),
+                    KvmGicV3::get_dist_size(),
+                    KvmGicV3::get_redists_addr(vcpu_count),
+                    KvmGicV3::get_redists_size(vcpu_count),
+                ],
+                vcpu_count,
+            })
+        }
+
+        fn init_device_attributes(
+            _vm: &Arc<dyn hypervisor::Vm>,
+            gic_device: &mut dyn GicDevice,
+        ) -> crate::aarch64::gic::Result<()> {
+            /* Setting up the distributor attribute.
+             We are placing the GIC below 1GB so we need to substract the size of the distributor.
+            */
+            Self::set_device_attribute(
+                gic_device.device(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ADDR,
+                u64::from(kvm_bindings::KVM_VGIC_V3_ADDR_TYPE_DIST),
+                &KvmGicV3::get_dist_addr() as *const u64 as u64,
+                0,
+            )?;
+
+            /* Setting up the redistributors' attribute.
+            We are calculating here the start of the redistributors address. We have one per CPU.
+            */
+            Self::set_device_attribute(
+                gic_device.device(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ADDR,
+                u64::from(kvm_bindings::KVM_VGIC_V3_ADDR_TYPE_REDIST),
+                &KvmGicV3::get_redists_addr(gic_device.vcpu_count()) as *const u64 as u64,
+                0,
+            )?;
+
+            Ok(())
+        }
+    }
+
+    pub const GIC_V3_SNAPSHOT_ID: &str = "gic-v3";
+    impl Snapshottable for KvmGicV3 {
+        fn id(&self) -> String {
+            GIC_V3_SNAPSHOT_ID.to_string()
+        }
+
+        fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
+            let gicr_typers = self.gicr_typers.clone();
+            Snapshot::new_from_versioned_state(&self.id(), &self.state(&gicr_typers).unwrap())
+        }
+
+        fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
+            let gicr_typers = self.gicr_typers.clone();
+            self.set_state(&gicr_typers, &snapshot.to_versioned_state(&self.id())?)
+                .map_err(|e| {
+                    MigratableError::Restore(anyhow!("Could not restore GICv3 state {:?}", e))
+                })
+        }
+    }
+
+    impl Pausable for KvmGicV3 {
+        fn pause(&mut self) -> std::result::Result<(), MigratableError> {
+            // Flush redistributors pending tables to guest RAM.
+            save_pending_tables(self.device()).map_err(|e| {
+                MigratableError::Pause(anyhow!("Could not save GICv3 GIC pending tables {:?}", e))
+            })?;
+
+            Ok(())
+        }
+    }
+    impl Transportable for KvmGicV3 {}
+    impl Migratable for KvmGicV3 {}
+}
--- a/arch/src/aarch64/gic/gicv3_its.rs
+++ b/arch/src/aarch64/gic/gicv3_its.rs
@@ -0,0 +1,514 @@
+// Copyright 2021 Arm Limited (or its affiliates). All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+//
+// This file implements the GicV3 device with ITS (Virtual Interrupt Translation Service).
+
+pub mod kvm {
+    use crate::aarch64::gic::dist_regs::{get_dist_regs, read_ctlr, set_dist_regs, write_ctlr};
+    use crate::aarch64::gic::icc_regs::{get_icc_regs, set_icc_regs};
+    use crate::aarch64::gic::redist_regs::{
+        construct_gicr_typers, get_redist_regs, set_redist_regs,
+    };
+
+    use crate::aarch64::gic::gicv3::kvm::KvmGicV3;
+    use crate::aarch64::gic::kvm::{save_pending_tables, KvmGicDevice};
+    use crate::aarch64::gic::GicDevice;
+    use crate::layout;
+    use anyhow::anyhow;
+    use hypervisor::kvm::kvm_bindings;
+    use hypervisor::CpuState;
+    use std::any::Any;
+    use std::convert::TryInto;
+    use std::sync::Arc;
+    use std::{boxed::Box, result};
+    use versionize::{VersionMap, Versionize, VersionizeResult};
+    use versionize_derive::Versionize;
+    use vm_migration::{
+        Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable,
+        VersionMapped,
+    };
+
+    const GITS_CTLR: u32 = 0x0000;
+    const GITS_IIDR: u32 = 0x0004;
+    const GITS_CBASER: u32 = 0x0080;
+    const GITS_CWRITER: u32 = 0x0088;
+    const GITS_CREADR: u32 = 0x0090;
+    const GITS_BASER: u32 = 0x0100;
+
+    /// Errors thrown while saving/restoring the GICv3ITS.
+    #[derive(Debug)]
+    pub enum Error {
+        /// Error in saving RDIST pending tables into guest RAM.
+        SavePendingTables(crate::aarch64::gic::Error),
+        /// Error in saving GIC distributor registers.
+        SaveDistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC distributor registers.
+        RestoreDistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GIC distributor control registers.
+        SaveDistributorCtrlRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC distributor control registers.
+        RestoreDistributorCtrlRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GIC redistributor registers.
+        SaveRedistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC redistributor registers.
+        RestoreRedistributorRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GIC CPU interface registers.
+        SaveIccRegisters(crate::aarch64::gic::Error),
+        /// Error in restoring GIC CPU interface registers.
+        RestoreIccRegisters(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS IIDR register.
+        SaveITSIIDR(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS IIDR register.
+        RestoreITSIIDR(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS CBASER register.
+        SaveITSCBASER(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS CBASER register.
+        RestoreITSCBASER(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS CREADR register.
+        SaveITSCREADR(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS CREADR register.
+        RestoreITSCREADR(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS CWRITER register.
+        SaveITSCWRITER(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS CWRITER register.
+        RestoreITSCWRITER(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS BASER register.
+        SaveITSBASER(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS BASER register.
+        RestoreITSBASER(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS CTLR register.
+        SaveITSCTLR(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS CTLR register.
+        RestoreITSCTLR(crate::aarch64::gic::Error),
+        /// Error in saving GICv3ITS restore tables.
+        SaveITSTables(crate::aarch64::gic::Error),
+        /// Error in restoring GICv3ITS restore tables.
+        RestoreITSTables(crate::aarch64::gic::Error),
+    }
+
+    type Result<T> = result::Result<T, Error>;
+
+    /// Access an ITS device attribute.
+    ///
+    /// This is a helper function to get/set the ITS device attribute depending
+    /// the bool parameter `set` provided.
+    pub fn gicv3_its_attr_access(
+        its_device: &Arc<dyn hypervisor::Device>,
+        group: u32,
+        attr: u32,
+        val: &u64,
+        set: bool,
+    ) -> crate::aarch64::gic::Result<()> {
+        let mut gicv3_its_attr = kvm_bindings::kvm_device_attr {
+            group,
+            attr: attr as u64,
+            addr: val as *const u64 as u64,
+            flags: 0,
+        };
+        if set {
+            its_device
+                .set_device_attr(&gicv3_its_attr)
+                .map_err(crate::aarch64::gic::Error::SetDeviceAttribute)?;
+        } else {
+            its_device
+                .get_device_attr(&mut gicv3_its_attr)
+                .map_err(crate::aarch64::gic::Error::GetDeviceAttribute)?;
+        }
+        Ok(())
+    }
+
+    /// Function that saves/restores ITS tables into guest RAM.
+    ///
+    /// The tables get flushed to guest RAM whenever the VM gets stopped.
+    pub fn gicv3_its_tables_access(
+        its_device: &Arc<dyn hypervisor::Device>,
+        save: bool,
+    ) -> crate::aarch64::gic::Result<()> {
+        let attr = if save {
+            u64::from(kvm_bindings::KVM_DEV_ARM_ITS_SAVE_TABLES)
+        } else {
+            u64::from(kvm_bindings::KVM_DEV_ARM_ITS_RESTORE_TABLES)
+        };
+
+        let init_gic_attr = kvm_bindings::kvm_device_attr {
+            group: kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
+            attr,
+            addr: 0,
+            flags: 0,
+        };
+        its_device
+            .set_device_attr(&init_gic_attr)
+            .map_err(crate::aarch64::gic::Error::SetDeviceAttribute)
+    }
+
+    pub struct KvmGicV3Its {
+        /// The hypervisor agnostic device for the GicV3
+        device: Arc<dyn hypervisor::Device>,
+
+        /// The hypervisor agnostic device for the Its device
+        its_device: Option<Arc<dyn hypervisor::Device>>,
+
+        /// Vector holding values of GICR_TYPER for each vCPU
+        gicr_typers: Vec<u64>,
+
+        /// GIC device properties, to be used for setting up the fdt entry
+        gic_properties: [u64; 4],
+
+        /// MSI device properties, to be used for setting up the fdt entry
+        msi_properties: [u64; 2],
+
+        /// Number of CPUs handled by the device
+        vcpu_count: u64,
+    }
+
+    #[derive(Versionize)]
+    pub struct Gicv3ItsState {
+        dist: Vec<u32>,
+        rdist: Vec<u32>,
+        icc: Vec<u32>,
+        // special register that enables interrupts and affinity routing
+        gicd_ctlr: u32,
+        its_ctlr: u64,
+        its_iidr: u64,
+        its_cbaser: u64,
+        its_cwriter: u64,
+        its_creadr: u64,
+        its_baser: [u64; 8],
+    }
+
+    impl VersionMapped for Gicv3ItsState {}
+
+    impl KvmGicV3Its {
+        fn get_msi_size() -> u64 {
+            layout::GIC_V3_ITS_SIZE
+        }
+
+        fn get_msi_addr(vcpu_count: u64) -> u64 {
+            KvmGicV3::get_redists_addr(vcpu_count) - KvmGicV3Its::get_msi_size()
+        }
+
+        /// Save the state of GICv3ITS.
+        fn state(&self, gicr_typers: &[u64]) -> Result<Gicv3ItsState> {
+            let gicd_ctlr =
+                read_ctlr(self.device()).map_err(Error::SaveDistributorCtrlRegisters)?;
+
+            let dist_state =
+                get_dist_regs(self.device()).map_err(Error::SaveDistributorRegisters)?;
+
+            let rdist_state = get_redist_regs(self.device(), gicr_typers)
+                .map_err(Error::SaveRedistributorRegisters)?;
+
+            let icc_state =
+                get_icc_regs(self.device(), gicr_typers).map_err(Error::SaveIccRegisters)?;
+
+            let its_baser_state: [u64; 8] = [0; 8];
+            for i in 0..8 {
+                gicv3_its_attr_access(
+                    self.its_device().unwrap(),
+                    kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                    GITS_BASER + i * 8,
+                    &its_baser_state[i as usize],
+                    false,
+                )
+                .map_err(Error::SaveITSBASER)?;
+            }
+
+            let its_ctlr_state: u64 = 0;
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CTLR,
+                &its_ctlr_state,
+                false,
+            )
+            .map_err(Error::SaveITSCTLR)?;
+
+            let its_cbaser_state: u64 = 0;
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CBASER,
+                &its_cbaser_state,
+                false,
+            )
+            .map_err(Error::SaveITSCBASER)?;
+
+            let its_creadr_state: u64 = 0;
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CREADR,
+                &its_creadr_state,
+                false,
+            )
+            .map_err(Error::SaveITSCREADR)?;
+
+            let its_cwriter_state: u64 = 0;
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CWRITER,
+                &its_cwriter_state,
+                false,
+            )
+            .map_err(Error::SaveITSCWRITER)?;
+
+            let its_iidr_state: u64 = 0;
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_IIDR,
+                &its_iidr_state,
+                false,
+            )
+            .map_err(Error::SaveITSIIDR)?;
+
+            Ok(Gicv3ItsState {
+                dist: dist_state,
+                rdist: rdist_state,
+                icc: icc_state,
+                gicd_ctlr,
+                its_ctlr: its_ctlr_state,
+                its_iidr: its_iidr_state,
+                its_cbaser: its_cbaser_state,
+                its_cwriter: its_cwriter_state,
+                its_creadr: its_creadr_state,
+                its_baser: its_baser_state,
+            })
+        }
+
+        /// Restore the state of GICv3ITS.
+        fn set_state(&mut self, gicr_typers: &[u64], state: &Gicv3ItsState) -> Result<()> {
+            write_ctlr(self.device(), state.gicd_ctlr)
+                .map_err(Error::RestoreDistributorCtrlRegisters)?;
+
+            set_dist_regs(self.device(), &state.dist)
+                .map_err(Error::RestoreDistributorRegisters)?;
+
+            set_redist_regs(self.device(), gicr_typers, &state.rdist)
+                .map_err(Error::RestoreRedistributorRegisters)?;
+
+            set_icc_regs(self.device(), gicr_typers, &state.icc)
+                .map_err(Error::RestoreIccRegisters)?;
+
+            //Restore GICv3ITS registers
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_IIDR,
+                &state.its_iidr,
+                true,
+            )
+            .map_err(Error::RestoreITSIIDR)?;
+
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CBASER,
+                &state.its_cbaser,
+                true,
+            )
+            .map_err(Error::RestoreITSCBASER)?;
+
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CREADR,
+                &state.its_creadr,
+                true,
+            )
+            .map_err(Error::RestoreITSCREADR)?;
+
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CWRITER,
+                &state.its_cwriter,
+                true,
+            )
+            .map_err(Error::RestoreITSCWRITER)?;
+
+            for i in 0..8 {
+                gicv3_its_attr_access(
+                    self.its_device().unwrap(),
+                    kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                    GITS_BASER + i * 8,
+                    &state.its_baser[i as usize],
+                    true,
+                )
+                .map_err(Error::RestoreITSBASER)?;
+            }
+
+            // Restore ITS tables
+            gicv3_its_tables_access(self.its_device().unwrap(), false)
+                .map_err(Error::RestoreITSTables)?;
+
+            gicv3_its_attr_access(
+                self.its_device().unwrap(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
+                GITS_CTLR,
+                &state.its_ctlr,
+                true,
+            )
+            .map_err(Error::RestoreITSCTLR)?;
+
+            Ok(())
+        }
+    }
+
+    impl GicDevice for KvmGicV3Its {
+        fn device(&self) -> &Arc<dyn hypervisor::Device> {
+            &self.device
+        }
+
+        fn its_device(&self) -> Option<&Arc<dyn hypervisor::Device>> {
+            self.its_device.as_ref()
+        }
+
+        fn fdt_compatibility(&self) -> &str {
+            "arm,gic-v3"
+        }
+
+        fn msi_compatible(&self) -> bool {
+            true
+        }
+
+        fn msi_compatibility(&self) -> &str {
+            "arm,gic-v3-its"
+        }
+
+        fn fdt_maint_irq(&self) -> u32 {
+            KvmGicV3::ARCH_GIC_V3_MAINT_IRQ
+        }
+
+        fn msi_properties(&self) -> &[u64] {
+            &self.msi_properties
+        }
+
+        fn device_properties(&self) -> &[u64] {
+            &self.gic_properties
+        }
+
+        fn vcpu_count(&self) -> u64 {
+            self.vcpu_count
+        }
+
+        fn set_its_device(&mut self, its_device: Option<Arc<dyn hypervisor::Device>>) {
+            self.its_device = its_device;
+        }
+
+        fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]) {
+            let gicr_typers = construct_gicr_typers(vcpu_states);
+            self.gicr_typers = gicr_typers;
+        }
+
+        fn as_any_concrete_mut(&mut self) -> &mut dyn Any {
+            self
+        }
+    }
+
+    impl KvmGicDevice for KvmGicV3Its {
+        fn version() -> u32 {
+            KvmGicV3::version()
+        }
+
+        fn create_device(
+            device: Arc<dyn hypervisor::Device>,
+            vcpu_count: u64,
+        ) -> Box<dyn GicDevice> {
+            Box::new(KvmGicV3Its {
+                device,
+                its_device: None,
+                gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
+                gic_properties: [
+                    KvmGicV3::get_dist_addr(),
+                    KvmGicV3::get_dist_size(),
+                    KvmGicV3::get_redists_addr(vcpu_count),
+                    KvmGicV3::get_redists_size(vcpu_count),
+                ],
+                msi_properties: [
+                    KvmGicV3Its::get_msi_addr(vcpu_count),
+                    KvmGicV3Its::get_msi_size(),
+                ],
+                vcpu_count,
+            })
+        }
+
+        fn init_device_attributes(
+            vm: &Arc<dyn hypervisor::Vm>,
+            gic_device: &mut dyn GicDevice,
+        ) -> crate::aarch64::gic::Result<()> {
+            KvmGicV3::init_device_attributes(vm, gic_device)?;
+
+            let mut its_device = kvm_bindings::kvm_create_device {
+                type_: kvm_bindings::kvm_device_type_KVM_DEV_TYPE_ARM_VGIC_ITS,
+                fd: 0,
+                flags: 0,
+            };
+
+            let its_fd = vm
+                .create_device(&mut its_device)
+                .map_err(crate::aarch64::gic::Error::CreateGic)?;
+
+            Self::set_device_attribute(
+                &its_fd,
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ADDR,
+                u64::from(kvm_bindings::KVM_VGIC_ITS_ADDR_TYPE),
+                &KvmGicV3Its::get_msi_addr(gic_device.vcpu_count()) as *const u64 as u64,
+                0,
+            )?;
+
+            Self::set_device_attribute(
+                &its_fd,
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
+                u64::from(kvm_bindings::KVM_DEV_ARM_VGIC_CTRL_INIT),
+                0,
+                0,
+            )?;
+
+            gic_device.set_its_device(Some(its_fd));
+
+            Ok(())
+        }
+    }
+
+    pub const GIC_V3_ITS_SNAPSHOT_ID: &str = "gic-v3-its";
+    impl Snapshottable for KvmGicV3Its {
+        fn id(&self) -> String {
+            GIC_V3_ITS_SNAPSHOT_ID.to_string()
+        }
+
+        fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
+            let gicr_typers = self.gicr_typers.clone();
+            Snapshot::new_from_versioned_state(&self.id(), &self.state(&gicr_typers).unwrap())
+        }
+
+        fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
+            let gicr_typers = self.gicr_typers.clone();
+            self.set_state(&gicr_typers, &snapshot.to_versioned_state(&self.id())?)
+                .map_err(|e| {
+                    MigratableError::Restore(anyhow!("Could not restore GICv3ITS state {:?}", e))
+                })
+        }
+    }
+
+    impl Pausable for KvmGicV3Its {
+        fn pause(&mut self) -> std::result::Result<(), MigratableError> {
+            // Flush redistributors pending tables to guest RAM.
+            save_pending_tables(self.device()).map_err(|e| {
+                MigratableError::Pause(anyhow!(
+                    "Could not save GICv3ITS GIC pending tables {:?}",
+                    e
+                ))
+            })?;
+            // Flush ITS tables to guest RAM.
+            gicv3_its_tables_access(self.its_device().unwrap(), true).map_err(|e| {
+                MigratableError::Pause(anyhow!("Could not save GICv3ITS ITS tables {:?}", e))
+            })?;
+
+            Ok(())
+        }
+    }
+    impl Transportable for KvmGicV3Its {}
+    impl Migratable for KvmGicV3Its {}
+}
--- a/hypervisor/src/kvm/aarch64/gic/icc_regs.rs
+++ b/hypervisor/src/kvm/aarch64/gic/icc_regs.rs
@@ -1,16 +1,14 @@
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
 // Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0

-use crate::arch::aarch64::gic::{Error, Result};
-use crate::device::HypervisorDeviceError;
-use crate::kvm::kvm_bindings::{
+use super::{Error, Result};
+use hypervisor::kvm::kvm_bindings::{
    kvm_device_attr, KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS, KVM_REG_ARM64_SYSREG_CRM_MASK,
    KVM_REG_ARM64_SYSREG_CRM_SHIFT, KVM_REG_ARM64_SYSREG_CRN_MASK, KVM_REG_ARM64_SYSREG_CRN_SHIFT,
    KVM_REG_ARM64_SYSREG_OP0_MASK, KVM_REG_ARM64_SYSREG_OP0_SHIFT, KVM_REG_ARM64_SYSREG_OP1_MASK,
    KVM_REG_ARM64_SYSREG_OP1_SHIFT, KVM_REG_ARM64_SYSREG_OP2_MASK, KVM_REG_ARM64_SYSREG_OP2_SHIFT,
 };
-use kvm_ioctls::DeviceFd;
+use std::sync::Arc;

 const KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT: u32 = 32;
 const KVM_DEV_ARM_VGIC_V3_MPIDR_MASK: u64 = 0xffffffff << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT as u64;
@@ -79,7 +77,13 @@ static VGIC_ICC_REGS: &[u64] = &[
    SYS_ICC_AP1R3_EL1,
 ];

-fn icc_attr_access(gic: &DeviceFd, offset: u64, typer: u64, val: &u32, set: bool) -> Result<()> {
+fn icc_attr_access(
+    gic: &Arc<dyn hypervisor::Device>,
+    offset: u64,
+    typer: u64,
+    val: &u32,
+    set: bool,
+) -> Result<()> {
    let mut gic_icc_attr = kvm_device_attr {
        group: KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS,
        attr: ((typer & KVM_DEV_ARM_VGIC_V3_MPIDR_MASK) | offset), // this needs the mpidr
@@ -87,19 +91,17 @@ fn icc_attr_access(gic: &DeviceFd, offset: u64, typer: u64, val: &u32, set: bool
        flags: 0,
    };
    if set {
-        gic.set_device_attr(&gic_icc_attr).map_err(|e| {
-            Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into()))
-        })?;
+        gic.set_device_attr(&gic_icc_attr)
+            .map_err(Error::SetDeviceAttribute)?;
    } else {
-        gic.get_device_attr(&mut gic_icc_attr).map_err(|e| {
-            Error::GetDeviceAttribute(HypervisorDeviceError::GetDeviceAttribute(e.into()))
-        })?;
+        gic.get_device_attr(&mut gic_icc_attr)
+            .map_err(Error::GetDeviceAttribute)?;
    }
    Ok(())
 }

 /// Get ICC registers.
-pub fn get_icc_regs(gic: &DeviceFd, gicr_typer: &[u64]) -> Result<Vec<u32>> {
+pub fn get_icc_regs(gic: &Arc<dyn hypervisor::Device>, gicr_typer: &[u64]) -> Result<Vec<u32>> {
    let mut state: Vec<u32> = Vec::new();
    // We need this for the ICC_AP<m>R<n>_EL1 registers.
    let mut num_priority_bits = 0;
@@ -152,7 +154,11 @@ pub fn get_icc_regs(gic: &DeviceFd, gicr_typer: &[u64]) -> Result<Vec<u32>> {
 }

 /// Set ICC registers.
-pub fn set_icc_regs(gic: &DeviceFd, gicr_typer: &[u64], state: &[u32]) -> Result<()> {
+pub fn set_icc_regs(
+    gic: &Arc<dyn hypervisor::Device>,
+    gicr_typer: &[u64],
+    state: &[u32],
+) -> Result<()> {
    let mut num_priority_bits = 0;
    let mut idx = 0;
    for ix in gicr_typer {
--- a/arch/src/aarch64/gic/mod.rs
+++ b/arch/src/aarch64/gic/mod.rs
@@ -0,0 +1,220 @@
+// Copyright 2021 Arm Limited (or its affiliates). All rights reserved.
+// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod dist_regs;
+pub mod gicv3;
+pub mod gicv3_its;
+pub mod icc_regs;
+pub mod redist_regs;
+
+pub use self::dist_regs::{get_dist_regs, read_ctlr, set_dist_regs, write_ctlr};
+pub use self::icc_regs::{get_icc_regs, set_icc_regs};
+pub use self::redist_regs::{get_redist_regs, set_redist_regs};
+use hypervisor::CpuState;
+use std::any::Any;
+use std::result;
+use std::sync::Arc;
+
+/// Errors thrown while setting up the GIC.
+#[derive(Debug)]
+pub enum Error {
+    /// Error while calling KVM ioctl for setting up the global interrupt controller.
+    CreateGic(hypervisor::HypervisorVmError),
+    /// Error while setting device attributes for the GIC.
+    SetDeviceAttribute(hypervisor::HypervisorDeviceError),
+    /// Error while getting device attributes for the GIC.
+    GetDeviceAttribute(hypervisor::HypervisorDeviceError),
+}
+type Result<T> = result::Result<T, Error>;
+
+pub trait GicDevice: Send {
+    /// Returns the hypervisor agnostic Device of the GIC device
+    fn device(&self) -> &Arc<dyn hypervisor::Device>;
+
+    /// Returns the hypervisor agnostic Device of the ITS device
+    fn its_device(&self) -> Option<&Arc<dyn hypervisor::Device>> {
+        None
+    }
+
+    /// Returns the fdt compatibility property of the device
+    fn fdt_compatibility(&self) -> &str;
+
+    /// Returns the maint_irq fdt property of the device
+    fn fdt_maint_irq(&self) -> u32;
+
+    /// Returns an array with GIC device properties
+    fn device_properties(&self) -> &[u64];
+
+    /// Returns the number of vCPUs this GIC handles
+    fn vcpu_count(&self) -> u64;
+
+    /// Returns whether the GIC device is MSI compatible or not
+    fn msi_compatible(&self) -> bool {
+        false
+    }
+
+    /// Returns the MSI compatibility property of the device
+    fn msi_compatibility(&self) -> &str {
+        ""
+    }
+
+    /// Returns the MSI reg property of the device
+    fn msi_properties(&self) -> &[u64] {
+        &[]
+    }
+
+    fn set_its_device(&mut self, its_device: Option<Arc<dyn hypervisor::Device>>);
+
+    /// Get the values of GICR_TYPER for each vCPU.
+    fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]);
+
+    /// Downcast the trait object to its concrete type.
+    fn as_any_concrete_mut(&mut self) -> &mut dyn Any;
+}
+
+pub mod kvm {
+    use super::GicDevice;
+    use super::Result;
+    use crate::aarch64::gic::gicv3_its::kvm::KvmGicV3Its;
+    use crate::layout;
+    use hypervisor::kvm::kvm_bindings;
+    use std::boxed::Box;
+    use std::sync::Arc;
+
+    /// Trait for GIC devices.
+    pub trait KvmGicDevice: Send + Sync + GicDevice {
+        /// Returns the GIC version of the device
+        fn version() -> u32;
+
+        /// Create the GIC device object
+        fn create_device(
+            device: Arc<dyn hypervisor::Device>,
+            vcpu_count: u64,
+        ) -> Box<dyn GicDevice>;
+
+        /// Setup the device-specific attributes
+        fn init_device_attributes(
+            vm: &Arc<dyn hypervisor::Vm>,
+            gic_device: &mut dyn GicDevice,
+        ) -> Result<()>;
+
+        /// Initialize a GIC device
+        fn init_device(vm: &Arc<dyn hypervisor::Vm>) -> Result<Arc<dyn hypervisor::Device>> {
+            let mut gic_device = kvm_bindings::kvm_create_device {
+                type_: Self::version(),
+                fd: 0,
+                flags: 0,
+            };
+
+            vm.create_device(&mut gic_device)
+                .map_err(super::Error::CreateGic)
+        }
+
+        /// Set a GIC device attribute
+        fn set_device_attribute(
+            device: &Arc<dyn hypervisor::Device>,
+            group: u32,
+            attr: u64,
+            addr: u64,
+            flags: u32,
+        ) -> Result<()> {
+            let attr = kvm_bindings::kvm_device_attr {
+                flags,
+                group,
+                attr,
+                addr,
+            };
+            device
+                .set_device_attr(&attr)
+                .map_err(super::Error::SetDeviceAttribute)?;
+
+            Ok(())
+        }
+
+        /// Get a GIC device attribute
+        fn get_device_attribute(
+            device: &Arc<dyn hypervisor::Device>,
+            group: u32,
+            attr: u64,
+            addr: u64,
+            flags: u32,
+        ) -> Result<()> {
+            let mut attr = kvm_bindings::kvm_device_attr {
+                flags,
+                group,
+                attr,
+                addr,
+            };
+            device
+                .get_device_attr(&mut attr)
+                .map_err(super::Error::GetDeviceAttribute)?;
+
+            Ok(())
+        }
+
+        /// Finalize the setup of a GIC device
+        fn finalize_device(gic_device: &dyn GicDevice) -> Result<()> {
+            /* We need to tell the kernel how many irqs to support with this vgic.
+             * See the `layout` module for details.
+             */
+            let nr_irqs: u32 = layout::IRQ_NUM;
+            let nr_irqs_ptr = &nr_irqs as *const u32;
+            Self::set_device_attribute(
+                gic_device.device(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
+                0,
+                nr_irqs_ptr as u64,
+                0,
+            )?;
+
+            /* Finalize the GIC.
+             * See https://code.woboq.org/linux/linux/virt/kvm/arm/vgic/vgic-kvm-device.c.html#211.
+             */
+            Self::set_device_attribute(
+                gic_device.device(),
+                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
+                u64::from(kvm_bindings::KVM_DEV_ARM_VGIC_CTRL_INIT),
+                0,
+                0,
+            )?;
+
+            Ok(())
+        }
+
+        /// Method to initialize the GIC device
+        #[allow(clippy::new_ret_no_self)]
+        fn new(vm: &Arc<dyn hypervisor::Vm>, vcpu_count: u64) -> Result<Box<dyn GicDevice>> {
+            let vgic_fd = Self::init_device(vm)?;
+
+            let mut device = Self::create_device(vgic_fd, vcpu_count);
+
+            Self::init_device_attributes(vm, &mut *device)?;
+
+            Self::finalize_device(&*device)?;
+
+            Ok(device)
+        }
+    }
+
+    /// Create a GICv3-ITS device.
+    ///
+    pub fn create_gic(vm: &Arc<dyn hypervisor::Vm>, vcpu_count: u64) -> Result<Box<dyn GicDevice>> {
+        debug!("creating a GICv3-ITS");
+        KvmGicV3Its::new(vm, vcpu_count)
+    }
+
+    /// Function that saves RDIST pending tables into guest RAM.
+    ///
+    /// The tables get flushed to guest RAM whenever the VM gets stopped.
+    pub fn save_pending_tables(gic: &Arc<dyn hypervisor::Device>) -> Result<()> {
+        let init_gic_attr = kvm_bindings::kvm_device_attr {
+            group: kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
+            attr: u64::from(kvm_bindings::KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES),
+            addr: 0,
+            flags: 0,
+        };
+        gic.set_device_attr(&init_gic_attr)
+            .map_err(super::Error::SetDeviceAttribute)
+    }
+}
--- a/hypervisor/src/kvm/aarch64/gic/redist_regs.rs
+++ b/hypervisor/src/kvm/aarch64/gic/redist_regs.rs
@@ -1,18 +1,10 @@
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
 // Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0

-use crate::arch::aarch64::gic::{Error, Result};
-use crate::device::HypervisorDeviceError;
-use crate::kvm::kvm_bindings::{
-    kvm_device_attr, KVM_DEV_ARM_VGIC_GRP_REDIST_REGS, KVM_REG_ARM64, KVM_REG_ARM64_SYSREG,
-    KVM_REG_ARM64_SYSREG_OP0_MASK, KVM_REG_ARM64_SYSREG_OP0_SHIFT, KVM_REG_ARM64_SYSREG_OP2_MASK,
-    KVM_REG_ARM64_SYSREG_OP2_SHIFT, KVM_REG_SIZE_U64,
-};
-use crate::kvm::Register;
-use crate::kvm::VcpuKvmState;
-use crate::CpuState;
-use kvm_ioctls::DeviceFd;
+use super::{Error, Result};
+use hypervisor::kvm::kvm_bindings::{kvm_device_attr, KVM_DEV_ARM_VGIC_GRP_REDIST_REGS};
+use hypervisor::CpuState;
+use std::sync::Arc;

 // Relevant redistributor registers that we want to save/restore.
 const GICR_CTLR: u32 = 0x0000;
@@ -39,12 +31,6 @@ const GICR_ICFGR0: u32 = GICR_SGI_OFFSET + 0x0C00;
 const KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT: u32 = 32;
 const KVM_DEV_ARM_VGIC_V3_MPIDR_MASK: u64 = 0xffffffff << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT as u64;

-const KVM_ARM64_SYSREG_MPIDR_EL1: u64 = KVM_REG_ARM64 as u64
-    | KVM_REG_SIZE_U64 as u64
-    | KVM_REG_ARM64_SYSREG as u64
-    | (((3_u64) << KVM_REG_ARM64_SYSREG_OP0_SHIFT) & KVM_REG_ARM64_SYSREG_OP0_MASK as u64)
-    | (((5_u64) << KVM_REG_ARM64_SYSREG_OP2_SHIFT) & KVM_REG_ARM64_SYSREG_OP2_MASK as u64);
-
 /// This is how we represent the registers of a distributor.
 /// It is relrvant their offset from the base address of the
 /// distributor.
@@ -96,27 +82,31 @@ static VGIC_SGI_REGS: &[RdistReg] = &[
    VGIC_RDIST_REG!(GICR_IPRIORITYR0, 32),
 ];

-fn redist_attr_access(gic: &DeviceFd, offset: u32, typer: u64, val: &u32, set: bool) -> Result<()> {
-    let mut gic_redist_attr = kvm_device_attr {
+fn redist_attr_access(
+    gic: &Arc<dyn hypervisor::Device>,
+    offset: u32,
+    typer: u64,
+    val: &u32,
+    set: bool,
+) -> Result<()> {
+    let mut gic_dist_attr = kvm_device_attr {
        group: KVM_DEV_ARM_VGIC_GRP_REDIST_REGS,
        attr: (typer & KVM_DEV_ARM_VGIC_V3_MPIDR_MASK) | (offset as u64), // this needs the mpidr
        addr: val as *const u32 as u64,
        flags: 0,
    };
    if set {
-        gic.set_device_attr(&gic_redist_attr).map_err(|e| {
-            Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into()))
-        })?;
+        gic.set_device_attr(&gic_dist_attr)
+            .map_err(Error::SetDeviceAttribute)?;
    } else {
-        gic.get_device_attr(&mut gic_redist_attr).map_err(|e| {
-            Error::GetDeviceAttribute(HypervisorDeviceError::GetDeviceAttribute(e.into()))
-        })?;
+        gic.get_device_attr(&mut gic_dist_attr)
+            .map_err(Error::GetDeviceAttribute)?;
    }
    Ok(())
 }

 fn access_redists_aux(
-    gic: &DeviceFd,
+    gic: &Arc<dyn hypervisor::Device>,
    gicr_typer: &[u64],
    state: &mut Vec<u32>,
    reg_list: &[RdistReg],
@@ -146,7 +136,7 @@ fn access_redists_aux(
 }

 /// Get redistributor registers.
-pub fn get_redist_regs(gic: &DeviceFd, gicr_typer: &[u64]) -> Result<Vec<u32>> {
+pub fn get_redist_regs(gic: &Arc<dyn hypervisor::Device>, gicr_typer: &[u64]) -> Result<Vec<u32>> {
    let mut state = Vec::new();
    let mut idx: usize = 0;
    access_redists_aux(
@@ -163,7 +153,11 @@ pub fn get_redist_regs(gic: &DeviceFd, gicr_typer: &[u64]) -> Result<Vec<u32>> {
 }

 /// Set redistributor registers.
-pub fn set_redist_regs(gic: &DeviceFd, gicr_typer: &[u64], state: &[u32]) -> Result<()> {
+pub fn set_redist_regs(
+    gic: &Arc<dyn hypervisor::Device>,
+    gicr_typer: &[u64],
+    state: &[u32],
+) -> Result<()> {
    let mut idx: usize = 0;
    let mut mut_state = state.to_owned();
    access_redists_aux(
@@ -199,7 +193,6 @@ pub fn construct_gicr_typers(vcpu_states: &[CpuState]) -> Vec<u64> {
     */
    let mut gicr_typers: Vec<u64> = Vec::new();
    for (index, state) in vcpu_states.iter().enumerate() {
-        let state: VcpuKvmState = state.clone().into();
        let last = {
            if index == vcpu_states.len() - 1 {
                1
@@ -207,14 +200,8 @@ pub fn construct_gicr_typers(vcpu_states: &[CpuState]) -> Vec<u64> {
                0
            }
        };
-        // state.sys_regs is a big collection of system registers, including MIPDR_EL1
-        let mpidr: Vec<Register> = state
-            .sys_regs
-            .into_iter()
-            .filter(|reg| reg.id == KVM_ARM64_SYSREG_MPIDR_EL1)
-            .collect();
        //calculate affinity
-        let mut cpu_affid = mpidr[0].addr & 1095233437695;
+        let mut cpu_affid = state.mpidr & 1095233437695;
        cpu_affid = ((cpu_affid & 0xFF00000000) >> 8) | (cpu_affid & 0xFFFFFF);
        gicr_typers.push((cpu_affid << 32) | (1 << 24) | (index as u64) << 8 | (last << 4));
    }
--- a/arch/src/aarch64/mod.rs
+++ b/arch/src/aarch64/mod.rs
@@ -4,21 +4,23 @@

 /// Module for the flattened device tree.
 pub mod fdt;
+/// Module for the global interrupt controller configuration.
+pub mod gic;
 /// Layout for this aarch64 system.
 pub mod layout;
-/// Module for system registers definition
+/// Logic for configuring aarch64 registers.
 pub mod regs;
 /// Module for loading UEFI binary.
 pub mod uefi;

 pub use self::fdt::DeviceInfoForFdt;
 use crate::{DeviceType, GuestMemoryMmap, NumaNodes, PciSpaceInfo, RegionType};
-use hypervisor::arch::aarch64::gic::Vgic;
+use gic::GicDevice;
 use log::{log_enabled, Level};
 use std::collections::HashMap;
 use std::convert::TryInto;
 use std::fmt::Debug;
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 use vm_memory::{Address, GuestAddress, GuestMemory, GuestUsize};

 /// Errors thrown while configuring aarch64 system.
@@ -31,13 +33,13 @@ pub enum Error {
    WriteFdtToMemory(fdt::Error),

    /// Failed to create a GIC.
-    SetupGic,
+    SetupGic(gic::Error),

    /// Failed to compute the initramfs address.
    InitramfsAddress,

    /// Error configuring the general purpose registers
-    RegsConfiguration(hypervisor::HypervisorCpuError),
+    RegsConfiguration(regs::Error),

    /// Error configuring the MPIDR register
    VcpuRegMpidr(hypervisor::HypervisorCpuError),
@@ -48,7 +50,7 @@ pub enum Error {

 impl From<Error> for super::Error {
    fn from(e: Error) -> super::Error {
-        super::Error::PlatformSpecific(e)
+        super::Error::AArch64Setup(e)
    }
 }

@@ -62,22 +64,16 @@ pub struct EntryPoint {

 /// Configure the specified VCPU, and return its MPIDR.
 pub fn configure_vcpu(
-    vcpu: &Arc<dyn hypervisor::Vcpu>,
+    fd: &Arc<dyn hypervisor::Vcpu>,
    id: u8,
    kernel_entry_point: Option<EntryPoint>,
 ) -> super::Result<u64> {
    if let Some(kernel_entry_point) = kernel_entry_point {
-        vcpu.setup_regs(
-            id,
-            kernel_entry_point.entry_addr.raw_value(),
-            super::layout::FDT_START.raw_value(),
-        )
-        .map_err(Error::RegsConfiguration)?;
+        regs::setup_regs(fd, id, kernel_entry_point.entry_addr.raw_value())
+            .map_err(Error::RegsConfiguration)?;
    }

-    let mpidr = vcpu
-        .get_sys_reg(regs::MPIDR_EL1)
-        .map_err(Error::VcpuRegMpidr)?;
+    let mpidr = fd.read_mpidr().map_err(Error::VcpuRegMpidr)?;
    Ok(mpidr)
 }

@@ -147,7 +143,7 @@ pub fn configure_system<T: DeviceInfoForFdt + Clone + Debug, S: ::std::hash::Bui
    initrd: &Option<super::InitramfsConfig>,
    pci_space_info: &[PciSpaceInfo],
    virtio_iommu_bdf: Option<u32>,
-    gic_device: &Arc<Mutex<dyn Vgic>>,
+    gic_device: &dyn GicDevice,
    numa_nodes: &NumaNodes,
    pmu_supported: bool,
 ) -> super::Result<()> {
@@ -189,10 +185,10 @@ pub fn initramfs_load_addr(
            if guest_mem.address_in_range(offset) {
                Ok(offset.raw_value())
            } else {
-                Err(super::Error::PlatformSpecific(Error::InitramfsAddress))
+                Err(super::Error::AArch64Setup(Error::InitramfsAddress))
            }
        }
-        None => Err(super::Error::PlatformSpecific(Error::InitramfsAddress)),
+        None => Err(super::Error::AArch64Setup(Error::InitramfsAddress)),
    }
 }

--- a/arch/src/aarch64/regs.rs
+++ b/arch/src/aarch64/regs.rs
@@ -1,41 +1,75 @@
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
+// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
+//
+// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the THIRD-PARTY file.

-///
-/// AArch64 system register encoding:
-/// See https://developer.arm.com/documentation/ddi0487 (chapter D12)
-///
-///   31      22  21 20 19 18 16 15 12 11  8 7   5 4  0
-///  +----------+---+-----+-----+-----+-----+-----+----+
-///  |1101010100| L | op0 | op1 | CRn | CRm | op2 | Rt |
-///  +----------+---+-----+-----+-----+-----+-----+----+
-///
-/// Notes:
-/// - L and Rt are reserved as implementation defined fields, ignored.
-///
-const SYSREG_HEAD: u32 = 0b1101010100u32 << 22;
-const SYSREG_OP0_SHIFT: u32 = 19;
-const SYSREG_OP0_MASK: u32 = 0b11u32 << 19;
-const SYSREG_OP1_SHIFT: u32 = 16;
-const SYSREG_OP1_MASK: u32 = 0b111u32 << 16;
-const SYSREG_CRN_SHIFT: u32 = 12;
-const SYSREG_CRN_MASK: u32 = 0b1111u32 << 12;
-const SYSREG_CRM_SHIFT: u32 = 8;
-const SYSREG_CRM_MASK: u32 = 0b1111u32 << 8;
-const SYSREG_OP2_SHIFT: u32 = 5;
-const SYSREG_OP2_MASK: u32 = 0b111u32 << 5;
+use hypervisor::kvm::kvm_bindings::{
+    kvm_regs, user_pt_regs, KVM_REG_ARM64, KVM_REG_ARM_CORE, KVM_REG_SIZE_U64,
+};
+use hypervisor::{arm64_core_reg_id, offset__of};
+use std::sync::Arc;
+use std::{mem, result};
+use vm_memory::Address;

-/// Define the ID of system registers
-#[macro_export]
-macro_rules! arm64_sys_reg {
-    ($name: tt, $op0: tt, $op1: tt, $crn: tt, $crm: tt, $op2: tt) => {
-        pub const $name: u32 = SYSREG_HEAD
-            | ((($op0 as u32) << SYSREG_OP0_SHIFT) & SYSREG_OP0_MASK as u32)
-            | ((($op1 as u32) << SYSREG_OP1_SHIFT) & SYSREG_OP1_MASK as u32)
-            | ((($crn as u32) << SYSREG_CRN_SHIFT) & SYSREG_CRN_MASK as u32)
-            | ((($crm as u32) << SYSREG_CRM_SHIFT) & SYSREG_CRM_MASK as u32)
-            | ((($op2 as u32) << SYSREG_OP2_SHIFT) & SYSREG_OP2_MASK as u32);
-    };
+/// Errors thrown while setting aarch64 registers.
+#[derive(Debug)]
+pub enum Error {
+    /// Failed to set core register (PC, PSTATE or general purpose ones).
+    SetCoreRegister(hypervisor::HypervisorCpuError),
+    /// Failed to get a system register.
+    GetSysRegister(hypervisor::HypervisorCpuError),
 }
+type Result<T> = result::Result<T, Error>;

-arm64_sys_reg!(MPIDR_EL1, 3, 0, 0, 0, 5);
+#[allow(non_upper_case_globals)]
+// PSR (Processor State Register) bits.
+// Taken from arch/arm64/include/uapi/asm/ptrace.h.
+const PSR_MODE_EL1h: u64 = 0x0000_0005;
+const PSR_F_BIT: u64 = 0x0000_0040;
+const PSR_I_BIT: u64 = 0x0000_0080;
+const PSR_A_BIT: u64 = 0x0000_0100;
+const PSR_D_BIT: u64 = 0x0000_0200;
+// Taken from arch/arm64/kvm/inject_fault.c.
+const PSTATE_FAULT_BITS_64: u64 = PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | PSR_I_BIT | PSR_D_BIT;
+
+/// Configure core registers for a given CPU.
+///
+/// # Arguments
+///
+/// * `vcpu` - Structure for the VCPU that holds the VCPU's fd.
+/// * `cpu_id` - Index of current vcpu.
+/// * `boot_ip` - Starting instruction pointer.
+/// * `mem` - Reserved DRAM for current VM.
+pub fn setup_regs(vcpu: &Arc<dyn hypervisor::Vcpu>, cpu_id: u8, boot_ip: u64) -> Result<()> {
+    let kreg_off = offset__of!(kvm_regs, regs);
+
+    // Get the register index of the PSTATE (Processor State) register.
+    let pstate = offset__of!(user_pt_regs, pstate) + kreg_off;
+    vcpu.set_reg(
+        arm64_core_reg_id!(KVM_REG_SIZE_U64, pstate),
+        PSTATE_FAULT_BITS_64,
+    )
+    .map_err(Error::SetCoreRegister)?;
+
+    // Other vCPUs are powered off initially awaiting PSCI wakeup.
+    if cpu_id == 0 {
+        // Setting the PC (Processor Counter) to the current program address (kernel address).
+        let pc = offset__of!(user_pt_regs, pc) + kreg_off;
+        vcpu.set_reg(arm64_core_reg_id!(KVM_REG_SIZE_U64, pc), boot_ip as u64)
+            .map_err(Error::SetCoreRegister)?;
+
+        // Last mandatory thing to set -> the address pointing to the FDT (also called DTB).
+        // "The device tree blob (dtb) must be placed on an 8-byte boundary and must
+        // not exceed 2 megabytes in size." -> https://www.kernel.org/doc/Documentation/arm64/booting.txt.
+        // We are choosing to place it the end of DRAM. See `get_fdt_addr`.
+        let regs0 = offset__of!(user_pt_regs, regs) + kreg_off;
+        vcpu.set_reg(
+            arm64_core_reg_id!(KVM_REG_SIZE_U64, regs0),
+            super::layout::FDT_START.raw_value(),
+        )
+        .map_err(Error::SetCoreRegister)?;
+    }
+    Ok(())
+}
--- a/arch/src/lib.rs
+++ b/arch/src/lib.rs
@@ -9,15 +9,15 @@

 #[macro_use]
 extern crate log;
+#[macro_use]
+extern crate serde_derive;

 #[cfg(target_arch = "x86_64")]
 use crate::x86_64::SgxEpcSection;
-use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 use std::fmt;
 use std::result;
 use std::sync::Arc;
-use thiserror::Error;
 use versionize::{VersionMap, Versionize, VersionizeError, VersionizeResult};
 use versionize_derive::Versionize;
 use vm_migration::VersionMapped;
@@ -26,27 +26,31 @@ type GuestMemoryMmap = vm_memory::GuestMemoryMmap<vm_memory::bitmap::AtomicBitma
 type GuestRegionMmap = vm_memory::GuestRegionMmap<vm_memory::bitmap::AtomicBitmap>;

 /// Type for returning error code.
-#[derive(Debug, Error)]
+#[derive(Debug)]
 pub enum Error {
    #[cfg(target_arch = "x86_64")]
-    #[error("Platform specific error (x86_64): {0:?}")]
-    PlatformSpecific(x86_64::Error),
+    /// X86_64 specific error triggered during system configuration.
+    X86_64Setup(x86_64::Error),
    #[cfg(target_arch = "aarch64")]
-    #[error("Platform specific error (aarch64): {0:?}")]
-    PlatformSpecific(aarch64::Error),
-    #[error("The memory map table extends past the end of guest memory")]
+    /// AArch64 specific error triggered during system configuration.
+    AArch64Setup(aarch64::Error),
+    /// The zero page extends past the end of guest_mem.
+    ZeroPagePastRamEnd,
+    /// Error writing the zero page of guest memory.
+    ZeroPageSetup(vm_memory::GuestMemoryError),
+    /// The memory map table extends past the end of guest memory.
    MemmapTablePastRamEnd,
-    #[error("Error writing memory map table to guest memory")]
+    /// Error writing memory map table to guest memory.
    MemmapTableSetup,
-    #[error("The hvm_start_info structure extends past the end of guest memory")]
+    /// The hvm_start_info structure extends past the end of guest memory.
    StartInfoPastRamEnd,
-    #[error("Error writing hvm_start_info to guest memory")]
+    /// Error writing hvm_start_info to guest memory.
    StartInfoSetup,
-    #[error("Failed to compute initramfs address")]
+    /// Failed to compute initramfs address.
    InitramfsAddress,
-    #[error("Error writing module entry to guest memory: {0}")]
-    ModlistSetup(#[source] vm_memory::GuestMemoryError),
-    #[error("RSDP extends past the end of guest memory")]
+    /// Error writing module entry to guest memory.
+    ModlistSetup(vm_memory::GuestMemoryError),
+    /// RSDP Beyond Guest Memory
    RsdpPastRamEnd,
 }

@@ -54,7 +58,7 @@ pub enum Error {
 pub type Result<T> = result::Result<T, Error>;

 /// Type for memory region types.
-#[derive(Clone, Copy, PartialEq, Eq, Debug, Serialize, Deserialize, Versionize)]
+#[derive(Clone, Copy, PartialEq, Debug, Serialize, Deserialize, Versionize)]
 pub enum RegionType {
    /// RAM type
    Ram,
--- a/arch/src/x86_64/interrupts.rs
+++ b/arch/src/x86_64/interrupts.rs
@@ -5,6 +5,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE-BSD-3-Clause file.

+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use hypervisor::x86_64::LapicState;
+use std::io::Cursor;
+use std::mem;
 use std::result;
 use std::sync::Arc;

@@ -16,6 +20,32 @@ pub const APIC_LVT1: usize = 0x360;
 pub const APIC_MODE_NMI: u32 = 0x4;
 pub const APIC_MODE_EXTINT: u32 = 0x7;

+pub fn get_klapic_reg(klapic: &LapicState, reg_offset: usize) -> u32 {
+    let sliceu8 = unsafe {
+        // This array is only accessed as parts of a u32 word, so interpret it as a u8 array.
+        // Cursors are only readable on arrays of u8, not i8(c_char).
+        mem::transmute::<&[i8], &[u8]>(&klapic.regs[reg_offset..])
+    };
+    let mut reader = Cursor::new(sliceu8);
+    // Following call can't fail if the offsets defined above are correct.
+    reader
+        .read_u32::<LittleEndian>()
+        .expect("Failed to read klapic register")
+}
+
+pub fn set_klapic_reg(klapic: &mut LapicState, reg_offset: usize, value: u32) {
+    let sliceu8 = unsafe {
+        // This array is only accessed as parts of a u32 word, so interpret it as a u8 array.
+        // Cursors are only readable on arrays of u8, not i8(c_char).
+        mem::transmute::<&mut [i8], &mut [u8]>(&mut klapic.regs[reg_offset..])
+    };
+    let mut writer = Cursor::new(sliceu8);
+    // Following call can't fail if the offsets defined above are correct.
+    writer
+        .write_u32::<LittleEndian>(value)
+        .expect("Failed to write klapic register")
+}
+
 pub fn set_apic_delivery_mode(reg: u32, mode: u32) -> u32 {
    ((reg) & !0x700) | ((mode) << 8)
 }
@@ -27,13 +57,42 @@ pub fn set_apic_delivery_mode(reg: u32, mode: u32) -> u32 {
 pub fn set_lint(vcpu: &Arc<dyn hypervisor::Vcpu>) -> Result<()> {
    let mut klapic = vcpu.get_lapic()?;

-    let lvt_lint0 = klapic.get_klapic_reg(APIC_LVT0);
-    klapic.set_klapic_reg(
+    let lvt_lint0 = get_klapic_reg(&klapic, APIC_LVT0);
+    set_klapic_reg(
+        &mut klapic,
        APIC_LVT0,
        set_apic_delivery_mode(lvt_lint0, APIC_MODE_EXTINT),
    );
-    let lvt_lint1 = klapic.get_klapic_reg(APIC_LVT1);
-    klapic.set_klapic_reg(APIC_LVT1, set_apic_delivery_mode(lvt_lint1, APIC_MODE_NMI));
+    let lvt_lint1 = get_klapic_reg(&klapic, APIC_LVT1);
+    set_klapic_reg(
+        &mut klapic,
+        APIC_LVT1,
+        set_apic_delivery_mode(lvt_lint1, APIC_MODE_NMI),
+    );

    vcpu.set_lapic(&klapic)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const KVM_APIC_REG_SIZE: usize = 0x400;
+
+    #[test]
+    fn test_set_and_get_klapic_reg() {
+        let reg_offset = 0x340;
+        let mut klapic = LapicState::default();
+        set_klapic_reg(&mut klapic, reg_offset, 3);
+        let value = get_klapic_reg(&klapic, reg_offset);
+        assert_eq!(value, 3);
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_set_and_get_klapic_out_of_bounds() {
+        let reg_offset = KVM_APIC_REG_SIZE + 10;
+        let mut klapic = LapicState::default();
+        set_klapic_reg(&mut klapic, reg_offset, 3);
+    }
+}
--- a/arch/src/x86_64/mod.rs
+++ b/arch/src/x86_64/mod.rs
@@ -15,8 +15,7 @@ pub mod regs;
 use crate::GuestMemoryMmap;
 use crate::InitramfsConfig;
 use crate::RegionType;
-use hypervisor::arch::x86::{CpuIdEntry, CPUID_FLAG_VALID_INDEX};
-use hypervisor::HypervisorError;
+use hypervisor::{CpuId, CpuIdEntry, HypervisorError, CPUID_FLAG_VALID_INDEX};
 use linux_loader::loader::bootparam::boot_params;
 use linux_loader::loader::elf::start_info::{
    hvm_memmap_table_entry, hvm_modlist_entry, hvm_start_info,
@@ -198,11 +197,11 @@ pub enum Error {

 impl From<Error> for super::Error {
    fn from(e: Error) -> super::Error {
-        super::Error::PlatformSpecific(e)
+        super::Error::X86_64Setup(e)
    }
 }

-#[allow(clippy::upper_case_acronyms)]
+#[allow(dead_code, clippy::upper_case_acronyms)]
 #[derive(Copy, Clone, Debug)]
 pub enum CpuidReg {
    EAX,
@@ -223,14 +222,16 @@ pub struct CpuidPatch {

 impl CpuidPatch {
    pub fn set_cpuid_reg(
-        cpuid: &mut Vec<CpuIdEntry>,
+        cpuid: &mut CpuId,
        function: u32,
        index: Option<u32>,
        reg: CpuidReg,
        value: u32,
    ) {
+        let entries = cpuid.as_mut_slice();
+
        let mut entry_found = false;
-        for entry in cpuid.iter_mut() {
+        for entry in entries.iter_mut() {
            if entry.function == function && (index == None || index.unwrap() == entry.index) {
                entry_found = true;
                match reg {
@@ -277,12 +278,16 @@ impl CpuidPatch {
                }
            }

-            cpuid.push(entry);
+            if let Err(e) = cpuid.push(entry) {
+                error!("Failed adding new CPUID entry: {:?}", e);
+            }
        }
    }

-    pub fn patch_cpuid(cpuid: &mut [CpuIdEntry], patches: Vec<CpuidPatch>) {
-        for entry in cpuid {
+    pub fn patch_cpuid(cpuid: &mut CpuId, patches: Vec<CpuidPatch>) {
+        let entries = cpuid.as_mut_slice();
+
+        for entry in entries.iter_mut() {
            for patch in patches.iter() {
                if entry.function == patch.function && entry.index == patch.index {
                    if let Some(flags_bit) = patch.flags_bit {
@@ -306,15 +311,16 @@ impl CpuidPatch {
    }

    pub fn is_feature_enabled(
-        cpuid: &[CpuIdEntry],
+        cpuid: &CpuId,
        function: u32,
        index: u32,
        reg: CpuidReg,
        feature_bit: usize,
    ) -> bool {
+        let entries = cpuid.as_slice();
        let mask = 1 << feature_bit;

-        for entry in cpuid {
+        for entry in entries.iter() {
            if entry.function == function && entry.index == index {
                let reg_val = match reg {
                    CpuidReg::EAX => entry.eax,
@@ -463,12 +469,12 @@ impl CpuidFeatureEntry {
    }

    fn get_features_from_cpuid(
-        cpuid: &[CpuIdEntry],
+        cpuid: &CpuId,
        feature_entry_list: &[CpuidFeatureEntry],
    ) -> Vec<u32> {
        let mut features = vec![0; feature_entry_list.len()];
        for (i, feature_entry) in feature_entry_list.iter().enumerate() {
-            for cpuid_entry in cpuid {
+            for cpuid_entry in cpuid.as_slice().iter() {
                if cpuid_entry.function == feature_entry.function
                    && cpuid_entry.index == feature_entry.index
                {
@@ -498,8 +504,8 @@ impl CpuidFeatureEntry {
    // The function returns `Error` (a.k.a. "incompatible"), when the CPUID features from `src_vm_cpuid`
    // is not a subset of those of the `dest_vm_cpuid`.
    pub fn check_cpuid_compatibility(
-        src_vm_cpuid: &[CpuIdEntry],
-        dest_vm_cpuid: &[CpuIdEntry],
+        src_vm_cpuid: &CpuId,
+        dest_vm_cpuid: &CpuId,
    ) -> Result<(), Error> {
        let feature_entry_list = &Self::checked_feature_entry_list();
        let src_vm_features = Self::get_features_from_cpuid(src_vm_cpuid, feature_entry_list);
@@ -551,7 +557,7 @@ pub fn generate_common_cpuid(
    phys_bits: u8,
    kvm_hyperv: bool,
    #[cfg(feature = "tdx")] tdx_enabled: bool,
-) -> super::Result<Vec<CpuIdEntry>> {
+) -> super::Result<CpuId> {
    let cpuid_patches = vec![
        // Patch tsc deadline timer bit
        CpuidPatch {
@@ -662,14 +668,16 @@ pub fn generate_common_cpuid(
    for i in 0x8000_0002..=0x8000_0004 {
        cpuid.retain(|c| c.function != i);
        let leaf = unsafe { std::arch::x86_64::__cpuid(i) };
-        cpuid.push(CpuIdEntry {
-            function: i,
-            eax: leaf.eax,
-            ebx: leaf.ebx,
-            ecx: leaf.ecx,
-            edx: leaf.edx,
-            ..Default::default()
-        });
+        cpuid
+            .push(CpuIdEntry {
+                function: i,
+                eax: leaf.eax,
+                ebx: leaf.ebx,
+                ecx: leaf.ecx,
+                edx: leaf.edx,
+                ..Default::default()
+            })
+            .map_err(Error::CpuidIdentification)?;
    }

    if kvm_hyperv {
@@ -678,44 +686,56 @@ pub fn generate_common_cpuid(
        cpuid.retain(|c| c.function != 0x4000_0001);
        // See "Hypervisor Top Level Functional Specification" for details
        // Compliance with "Hv#1" requires leaves up to 0x4000_000a
-        cpuid.push(CpuIdEntry {
-            function: 0x40000000,
-            eax: 0x4000000a, // Maximum cpuid leaf
-            ebx: 0x756e694c, // "Linu"
-            ecx: 0x564b2078, // "x KV"
-            edx: 0x7648204d, // "M Hv"
-            ..Default::default()
-        });
-        cpuid.push(CpuIdEntry {
-            function: 0x40000001,
-            eax: 0x31237648, // "Hv#1"
-            ..Default::default()
-        });
-        cpuid.push(CpuIdEntry {
-            function: 0x40000002,
-            eax: 0x3839,  // "Build number"
-            ebx: 0xa0000, // "Version"
-            ..Default::default()
-        });
-        cpuid.push(CpuIdEntry {
-            function: 0x4000_0003,
-            eax: 1 << 1 // AccessPartitionReferenceCounter
+        cpuid
+            .push(CpuIdEntry {
+                function: 0x40000000,
+                eax: 0x4000000a, // Maximum cpuid leaf
+                ebx: 0x756e694c, // "Linu"
+                ecx: 0x564b2078, // "x KV"
+                edx: 0x7648204d, // "M Hv"
+                ..Default::default()
+            })
+            .map_err(Error::CpuidKvmHyperV)?;
+        cpuid
+            .push(CpuIdEntry {
+                function: 0x40000001,
+                eax: 0x31237648, // "Hv#1"
+                ..Default::default()
+            })
+            .map_err(Error::CpuidKvmHyperV)?;
+        cpuid
+            .push(CpuIdEntry {
+                function: 0x40000002,
+                eax: 0x3839,  // "Build number"
+                ebx: 0xa0000, // "Version"
+                ..Default::default()
+            })
+            .map_err(Error::CpuidKvmHyperV)?;
+        cpuid
+            .push(CpuIdEntry {
+                function: 0x4000_0003,
+                eax: 1 << 1 // AccessPartitionReferenceCounter
                   | 1 << 2 // AccessSynicRegs
                   | 1 << 3 // AccessSyntheticTimerRegs
                   | 1 << 9, // AccessPartitionReferenceTsc
-            edx: 1 << 3, // CPU dynamic partitioning
-            ..Default::default()
-        });
-        cpuid.push(CpuIdEntry {
-            function: 0x4000_0004,
-            eax: 1 << 5, // Recommend relaxed timing
-            ..Default::default()
-        });
-        for i in 0x4000_0005..=0x4000_000a {
-            cpuid.push(CpuIdEntry {
-                function: i,
+                edx: 1 << 3, // CPU dynamic partitioning
                ..Default::default()
-            });
+            })
+            .map_err(Error::CpuidKvmHyperV)?;
+        cpuid
+            .push(CpuIdEntry {
+                function: 0x4000_0004,
+                eax: 1 << 5, // Recommend relaxed timing
+                ..Default::default()
+            })
+            .map_err(Error::CpuidKvmHyperV)?;
+        for i in 0x4000_0005..=0x4000_000a {
+            cpuid
+                .push(CpuIdEntry {
+                    function: i,
+                    ..Default::default()
+                })
+                .map_err(Error::CpuidKvmHyperV)?;
        }
    }

@@ -723,11 +743,11 @@ pub fn generate_common_cpuid(
 }

 pub fn configure_vcpu(
-    vcpu: &Arc<dyn hypervisor::Vcpu>,
+    fd: &Arc<dyn hypervisor::Vcpu>,
    id: u8,
    kernel_entry_point: Option<EntryPoint>,
    vm_memory: &GuestMemoryAtomic<GuestMemoryMmap>,
-    cpuid: Vec<CpuIdEntry>,
+    cpuid: CpuId,
    kvm_hyperv: bool,
 ) -> super::Result<()> {
    // Per vCPU CPUID changes; common are handled via generate_common_cpuid()
@@ -735,23 +755,23 @@ pub fn configure_vcpu(
    CpuidPatch::set_cpuid_reg(&mut cpuid, 0xb, None, CpuidReg::EDX, u32::from(id));
    CpuidPatch::set_cpuid_reg(&mut cpuid, 0x1f, None, CpuidReg::EDX, u32::from(id));

-    vcpu.set_cpuid2(&cpuid)
+    fd.set_cpuid2(&cpuid)
        .map_err(|e| Error::SetSupportedCpusFailed(e.into()))?;

    if kvm_hyperv {
-        vcpu.enable_hyperv_synic().unwrap();
+        fd.enable_hyperv_synic().unwrap();
    }

-    regs::setup_msrs(vcpu).map_err(Error::MsrsConfiguration)?;
+    regs::setup_msrs(fd).map_err(Error::MsrsConfiguration)?;
    if let Some(kernel_entry_point) = kernel_entry_point {
        if let Some(entry_addr) = kernel_entry_point.entry_addr {
            // Safe to unwrap because this method is called after the VM is configured
-            regs::setup_regs(vcpu, entry_addr.raw_value()).map_err(Error::RegsConfiguration)?;
-            regs::setup_fpu(vcpu).map_err(Error::FpuConfiguration)?;
-            regs::setup_sregs(&vm_memory.memory(), vcpu).map_err(Error::SregsConfiguration)?;
+            regs::setup_regs(fd, entry_addr.raw_value()).map_err(Error::RegsConfiguration)?;
+            regs::setup_fpu(fd).map_err(Error::FpuConfiguration)?;
+            regs::setup_sregs(&vm_memory.memory(), fd).map_err(Error::SregsConfiguration)?;
        }
    }
-    interrupts::set_lint(vcpu).map_err(|e| Error::LocalIntConfiguration(e.into()))?;
+    interrupts::set_lint(fd).map_err(|e| Error::LocalIntConfiguration(e.into()))?;
    Ok(())
 }

@@ -818,17 +838,13 @@ pub fn configure_system(
    _num_cpus: u8,
    rsdp_addr: Option<GuestAddress>,
    sgx_epc_region: Option<SgxEpcRegion>,
-    serial_number: Option<&str>,
-    uuid: Option<&str>,
-    oem_strings: Option<&[&str]>,
 ) -> super::Result<()> {
    // Write EBDA address to location where ACPICA expects to find it
    guest_mem
        .write_obj((layout::EBDA_START.0 >> 4) as u16, layout::EBDA_POINTER)
        .map_err(Error::EbdaSetup)?;

-    let size = smbios::setup_smbios(guest_mem, serial_number, uuid, oem_strings)
-        .map_err(Error::SmbiosSetup)?;
+    let size = smbios::setup_smbios(guest_mem).map_err(Error::SmbiosSetup)?;

    // Place the MP table after the SMIOS table aligned to 16 bytes
    let offset = GuestAddress(layout::SMBIOS_START).unchecked_add(size);
@@ -1038,7 +1054,7 @@ pub fn get_host_cpu_phys_bits() -> u8 {
 }

 fn update_cpuid_topology(
-    cpuid: &mut Vec<CpuIdEntry>,
+    cpuid: &mut CpuId,
    threads_per_core: u8,
    cores_per_die: u8,
    dies_per_package: u8,
@@ -1102,10 +1118,7 @@ fn update_cpuid_topology(

 // The goal is to update the CPUID sub-leaves to reflect the number of EPC
 // sections exposed to the guest.
-fn update_cpuid_sgx(
-    cpuid: &mut Vec<CpuIdEntry>,
-    epc_sections: Vec<SgxEpcSection>,
-) -> Result<(), Error> {
+fn update_cpuid_sgx(cpuid: &mut CpuId, epc_sections: Vec<SgxEpcSection>) -> Result<(), Error> {
    // Something's wrong if there's no EPC section.
    if epc_sections.is_empty() {
        return Err(Error::NoSgxEpcSection);
@@ -1180,9 +1193,6 @@ mod tests {
            1,
            Some(layout::RSDP_POINTER),
            None,
-            None,
-            None,
-            None,
        );
        assert!(config_err.is_err());

@@ -1196,18 +1206,7 @@ mod tests {
            .collect();
        let gm = GuestMemoryMmap::from_ranges(&ram_regions).unwrap();

-        configure_system(
-            &gm,
-            GuestAddress(0),
-            &None,
-            no_vcpus,
-            None,
-            None,
-            None,
-            None,
-            None,
-        )
-        .unwrap();
+        configure_system(&gm, GuestAddress(0), &None, no_vcpus, None, None).unwrap();

        // Now assigning some memory that is equal to the start of the 32bit memory hole.
        let mem_size = 3328 << 20;
@@ -1218,31 +1217,9 @@ mod tests {
            .map(|r| (r.0, r.1))
            .collect();
        let gm = GuestMemoryMmap::from_ranges(&ram_regions).unwrap();
-        configure_system(
-            &gm,
-            GuestAddress(0),
-            &None,
-            no_vcpus,
-            None,
-            None,
-            None,
-            None,
-            None,
-        )
-        .unwrap();
+        configure_system(&gm, GuestAddress(0), &None, no_vcpus, None, None).unwrap();

-        configure_system(
-            &gm,
-            GuestAddress(0),
-            &None,
-            no_vcpus,
-            None,
-            None,
-            None,
-            None,
-            None,
-        )
-        .unwrap();
+        configure_system(&gm, GuestAddress(0), &None, no_vcpus, None, None).unwrap();

        // Now assigning some memory that falls after the 32bit memory hole.
        let mem_size = 3330 << 20;
@@ -1253,31 +1230,9 @@ mod tests {
            .map(|r| (r.0, r.1))
            .collect();
        let gm = GuestMemoryMmap::from_ranges(&ram_regions).unwrap();
-        configure_system(
-            &gm,
-            GuestAddress(0),
-            &None,
-            no_vcpus,
-            None,
-            None,
-            None,
-            None,
-            None,
-        )
-        .unwrap();
+        configure_system(&gm, GuestAddress(0), &None, no_vcpus, None, None).unwrap();

-        configure_system(
-            &gm,
-            GuestAddress(0),
-            &None,
-            no_vcpus,
-            None,
-            None,
-            None,
-            None,
-            None,
-        )
-        .unwrap();
+        configure_system(&gm, GuestAddress(0), &None, no_vcpus, None, None).unwrap();
    }

    #[test]
--- a/arch/src/x86_64/regs.rs
+++ b/arch/src/x86_64/regs.rs
@@ -9,8 +9,8 @@
 use crate::layout::{BOOT_GDT_START, BOOT_IDT_START, PVH_INFO_START};
 use crate::GuestMemoryMmap;
 use hypervisor::arch::x86::gdt::{gdt_entry, segment_from_gdt};
-use hypervisor::arch::x86::regs::CR0_PE;
-use hypervisor::arch::x86::{FpuState, SpecialRegisters, StandardRegisters};
+use hypervisor::arch::x86::regs::*;
+use hypervisor::x86_64::{FpuState, SpecialRegisters, StandardRegisters};
 use std::sync::Arc;
 use std::{mem, result};
 use vm_memory::{Address, Bytes, GuestMemory, GuestMemoryError};
@@ -66,7 +66,7 @@ pub fn setup_fpu(vcpu: &Arc<dyn hypervisor::Vcpu>) -> Result<()> {
 ///
 /// * `vcpu` - Structure for the VCPU that holds the VCPU's fd.
 pub fn setup_msrs(vcpu: &Arc<dyn hypervisor::Vcpu>) -> Result<()> {
-    vcpu.set_msrs(&vcpu.boot_msr_entries())
+    vcpu.set_msrs(&hypervisor::x86_64::boot_msr_entries())
        .map_err(Error::SetModelSpecificRegisters)?;

    Ok(())
--- a/arch/src/x86_64/smbios.rs
+++ b/arch/src/x86_64/smbios.rs
@@ -12,10 +12,10 @@ use std::fmt::{self, Display};
 use std::mem;
 use std::result;
 use std::slice;
-use uuid::Uuid;
 use vm_memory::ByteValued;
 use vm_memory::{Address, Bytes, GuestAddress};

+#[allow(unused_variables)]
 #[derive(Debug)]
 pub enum Error {
    /// There was too little guest memory to store the entire SMBIOS table.
@@ -28,8 +28,6 @@ pub enum Error {
    WriteSmbiosEp,
    /// Failure to write additional data to memory
    WriteData,
-    /// Failure to parse uuid, uuid format may be error
-    ParseUuid(uuid::Error),
 }

 impl std::error::Error for Error {}
@@ -39,16 +37,11 @@ impl Display for Error {
        use self::Error::*;

        let description = match self {
-            NotEnoughMemory => {
-                "There was too little guest memory to store the SMBIOS table".to_string()
-            }
-            AddressOverflow => {
-                "The SMBIOS table has too little address space to be stored".to_string()
-            }
-            Clear => "Failure while zeroing out the memory for the SMBIOS table".to_string(),
-            WriteSmbiosEp => "Failure to write SMBIOS entrypoint structure".to_string(),
-            WriteData => "Failure to write additional data to memory".to_string(),
-            ParseUuid(e) => format!("Failure to parse uuid: {}", e),
+            NotEnoughMemory => "There was too little guest memory to store the SMBIOS table",
+            AddressOverflow => "The SMBIOS table has too little address space to be stored",
+            Clear => "Failure while zeroing out the memory for the SMBIOS table",
+            WriteSmbiosEp => "Failure to write SMBIOS entrypoint structure",
+            WriteData => "Failure to write additional data to memory",
        };

        write!(f, "SMBIOS error: {}", description)
@@ -61,7 +54,6 @@ pub type Result<T> = result::Result<T, Error>;
 const SM3_MAGIC_IDENT: &[u8; 5usize] = b"_SM3_";
 const BIOS_INFORMATION: u8 = 0;
 const SYSTEM_INFORMATION: u8 = 1;
-const OEM_STRINGS: u8 = 11;
 const END_OF_TABLE: u8 = 127;
 const PCI_SUPPORTED: u64 = 1 << 7;
 const IS_VIRTUAL_MACHINE: u8 = 1 << 4;
@@ -76,81 +68,75 @@ fn compute_checksum<T: Copy>(v: &T) -> u8 {
    (!checksum).wrapping_add(1)
 }

-#[repr(C)]
 #[repr(packed)]
-#[derive(Default, Copy, Clone)]
-struct Smbios30Entrypoint {
-    signature: [u8; 5usize],
-    checksum: u8,
-    length: u8,
-    majorver: u8,
-    minorver: u8,
-    docrev: u8,
-    revision: u8,
-    reserved: u8,
-    max_size: u32,
-    physptr: u64,
+#[derive(Default, Copy)]
+pub struct Smbios30Entrypoint {
+    pub signature: [u8; 5usize],
+    pub checksum: u8,
+    pub length: u8,
+    pub majorver: u8,
+    pub minorver: u8,
+    pub docrev: u8,
+    pub revision: u8,
+    pub reserved: u8,
+    pub max_size: u32,
+    pub physptr: u64,
 }

-#[repr(C)]
-#[repr(packed)]
-#[derive(Default, Copy, Clone)]
-struct SmbiosBiosInfo {
-    r#type: u8,
-    length: u8,
-    handle: u16,
-    vendor: u8,
-    version: u8,
-    start_addr: u16,
-    release_date: u8,
-    rom_size: u8,
-    characteristics: u64,
-    characteristics_ext1: u8,
-    characteristics_ext2: u8,
+impl Clone for Smbios30Entrypoint {
+    fn clone(&self) -> Self {
+        *self
+    }
 }

-#[repr(C)]
 #[repr(packed)]
-#[derive(Default, Copy, Clone)]
-struct SmbiosSysInfo {
-    r#type: u8,
-    length: u8,
-    handle: u16,
-    manufacturer: u8,
-    product_name: u8,
-    version: u8,
-    serial_number: u8,
-    uuid: [u8; 16usize],
-    wake_up_type: u8,
-    sku: u8,
-    family: u8,
+#[derive(Default, Copy)]
+pub struct SmbiosBiosInfo {
+    pub typ: u8,
+    pub length: u8,
+    pub handle: u16,
+    pub vendor: u8,
+    pub version: u8,
+    pub start_addr: u16,
+    pub release_date: u8,
+    pub rom_size: u8,
+    pub characteristics: u64,
+    pub characteristics_ext1: u8,
+    pub characteristics_ext2: u8,
 }

-#[repr(C)]
-#[repr(packed)]
-#[derive(Default, Copy, Clone)]
-struct SmbiosOemStrings {
-    r#type: u8,
-    length: u8,
-    handle: u16,
-    count: u8,
+impl Clone for SmbiosBiosInfo {
+    fn clone(&self) -> Self {
+        *self
+    }
 }

-#[repr(C)]
 #[repr(packed)]
-#[derive(Default, Copy, Clone)]
-struct SmbiosEndOfTable {
-    r#type: u8,
-    length: u8,
-    handle: u16,
+#[derive(Default, Copy)]
+pub struct SmbiosSysInfo {
+    pub typ: u8,
+    pub length: u8,
+    pub handle: u16,
+    pub manufacturer: u8,
+    pub product_name: u8,
+    pub version: u8,
+    pub serial_number: u8,
+    pub uuid: [u8; 16usize],
+    pub wake_up_type: u8,
+    pub sku: u8,
+    pub family: u8,
+}
+
+impl Clone for SmbiosSysInfo {
+    fn clone(&self) -> Self {
+        *self
+    }
 }

 // SAFETY: These data structures only contain a series of integers
 unsafe impl ByteValued for Smbios30Entrypoint {}
 unsafe impl ByteValued for SmbiosBiosInfo {}
 unsafe impl ByteValued for SmbiosSysInfo {}
-unsafe impl ByteValued for SmbiosOemStrings {}
-unsafe impl ByteValued for SmbiosEndOfTable {}

 fn write_and_incr<T: ByteValued>(
    mem: &GuestMemoryMmap,
@@ -176,12 +162,7 @@ fn write_string(
    Ok(curptr)
 }

-pub fn setup_smbios(
-    mem: &GuestMemoryMmap,
-    serial_number: Option<&str>,
-    uuid: Option<&str>,
-    oem_strings: Option<&[&str]>,
-) -> Result<u64> {
+pub fn setup_smbios(mem: &GuestMemoryMmap) -> Result<u64> {
    let physptr = GuestAddress(SMBIOS_START)
        .checked_add(mem::size_of::<Smbios30Entrypoint>() as u64)
        .ok_or(Error::NotEnoughMemory)?;
@@ -191,7 +172,7 @@ pub fn setup_smbios(
    {
        handle += 1;
        let smbios_biosinfo = SmbiosBiosInfo {
-            r#type: BIOS_INFORMATION,
+            typ: BIOS_INFORMATION,
            length: mem::size_of::<SmbiosBiosInfo>() as u8,
            handle,
            vendor: 1,  // First string written in this section
@@ -208,59 +189,29 @@ pub fn setup_smbios(

    {
        handle += 1;
-
-        let uuid_number = uuid
-            .map(Uuid::parse_str)
-            .transpose()
-            .map_err(Error::ParseUuid)?
-            .unwrap_or(Uuid::nil());
        let smbios_sysinfo = SmbiosSysInfo {
-            r#type: SYSTEM_INFORMATION,
+            typ: SYSTEM_INFORMATION,
            length: mem::size_of::<SmbiosSysInfo>() as u8,
            handle,
            manufacturer: 1, // First string written in this section
            product_name: 2, // Second string written in this section
-            serial_number: serial_number.map(|_| 3).unwrap_or_default(), // 3rd string
-            uuid: uuid_number.to_bytes_le(), // set uuid
            ..Default::default()
        };
        curptr = write_and_incr(mem, smbios_sysinfo, curptr)?;
        curptr = write_string(mem, "Cloud Hypervisor", curptr)?;
        curptr = write_string(mem, "cloud-hypervisor", curptr)?;
-        if let Some(serial_number) = serial_number {
-            curptr = write_string(mem, serial_number, curptr)?;
-        }
-        curptr = write_and_incr(mem, 0u8, curptr)?;
-    }
-
-    if let Some(oem_strings) = oem_strings {
-        handle += 1;
-
-        let smbios_oemstrings = SmbiosOemStrings {
-            r#type: OEM_STRINGS,
-            length: mem::size_of::<SmbiosOemStrings>() as u8,
-            handle,
-            count: oem_strings.len() as u8,
-        };
-
-        curptr = write_and_incr(mem, smbios_oemstrings, curptr)?;
-
-        for s in oem_strings {
-            curptr = write_string(mem, s, curptr)?;
-        }
-
        curptr = write_and_incr(mem, 0u8, curptr)?;
    }

    {
        handle += 1;
-        let smbios_end = SmbiosEndOfTable {
-            r#type: END_OF_TABLE,
-            length: mem::size_of::<SmbiosEndOfTable>() as u8,
+        let smbios_sysinfo = SmbiosSysInfo {
+            typ: END_OF_TABLE,
+            length: mem::size_of::<SmbiosSysInfo>() as u8,
            handle,
+            ..Default::default()
        };
-        curptr = write_and_incr(mem, smbios_end, curptr)?;
-        curptr = write_and_incr(mem, 0u8, curptr)?;
+        curptr = write_and_incr(mem, smbios_sysinfo, curptr)?;
        curptr = write_and_incr(mem, 0u8, curptr)?;
    }

@@ -282,7 +233,7 @@ pub fn setup_smbios(
            .map_err(|_| Error::WriteSmbiosEp)?;
    }

-    Ok(curptr.unchecked_offset_from(physptr) + std::mem::size_of::<Smbios30Entrypoint>() as u64)
+    Ok(curptr.unchecked_offset_from(physptr))
 }

 #[cfg(test)]
@@ -312,7 +263,7 @@ mod tests {
    fn entrypoint_checksum() {
        let mem = GuestMemoryMmap::from_ranges(&[(GuestAddress(SMBIOS_START), 4096)]).unwrap();

-        setup_smbios(&mem, None, None, None).unwrap();
+        setup_smbios(&mem).unwrap();

        let smbios_ep: Smbios30Entrypoint = mem.read_obj(GuestAddress(SMBIOS_START)).unwrap();

--- a/block_util/Cargo.toml
+++ b/block_util/Cargo.toml
@@ -8,17 +8,17 @@ edition = "2021"
 default = []

 [dependencies]
-io-uring = "0.5.3"
-libc = "0.2.131"
-log = "0.4.17"
+io-uring = "0.5.2"
+libc = "0.2.123"
+log = "0.4.16"
 qcow = { path = "../qcow" }
-thiserror = "1.0.32"
+thiserror = "1.0.30"
 versionize = "0.1.6"
 versionize_derive = "0.1.4"
 vhdx = { path = "../vhdx" }
 virtio-bindings = { version = "0.1.0", features = ["virtio-v5_0_0"] }
-virtio-queue = "0.5.0"
-vm-memory = { version = "0.8.0", features = ["backend-mmap", "backend-atomic", "backend-bitmap"] }
+virtio-queue = "0.2.0"
+vm-memory = { version = "0.7.0", features = ["backend-mmap", "backend-atomic", "backend-bitmap"] }
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.10.0"
+vmm-sys-util = "0.9.0"

--- a/block_util/src/async_io.rs
+++ b/block_util/src/async_io.rs
@@ -8,7 +8,7 @@ use std::fs::File;
 use std::os::unix::io::AsRawFd;
 use thiserror::Error;
 use vmm_sys_util::eventfd::EventFd;
-use vmm_sys_util::{ioctl_io_nr, ioctl_ioc_nr};
+use vmm_sys_util::{ioctl_expr, ioctl_io_nr, ioctl_ioc_nr};

 #[derive(Error, Debug)]
 pub enum DiskFileError {
@@ -104,7 +104,7 @@ impl DiskTopology {

 pub type DiskFileResult<T> = std::result::Result<T, DiskFileError>;

-pub trait DiskFile: Send {
+pub trait DiskFile: Send + Sync {
    fn size(&mut self) -> DiskFileResult<u64>;
    fn new_async_io(&self, ring_depth: u32) -> DiskFileResult<Box<dyn AsyncIo>>;
    fn topology(&mut self) -> DiskTopology {
@@ -127,7 +127,7 @@ pub enum AsyncIoError {

 pub type AsyncIoResult<T> = std::result::Result<T, AsyncIoError>;

-pub trait AsyncIo: Send {
+pub trait AsyncIo: Send + Sync {
    fn notifier(&self) -> &EventFd;
    fn read_vectored(
        &mut self,
--- a/block_util/src/lib.rs
+++ b/block_util/src/lib.rs
@@ -32,7 +32,6 @@ use std::path::Path;
 use std::result;
 use std::sync::Arc;
 use std::sync::MutexGuard;
-use thiserror::Error;
 use versionize::{VersionMap, Versionize, VersionizeResult};
 use versionize_derive::Versionize;
 use virtio_bindings::bindings::virtio_blk::*;
@@ -49,25 +48,25 @@ type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;
 const SECTOR_SHIFT: u8 = 9;
 pub const SECTOR_SIZE: u64 = 0x01 << SECTOR_SHIFT;

-#[derive(Error, Debug)]
+#[derive(Debug)]
 pub enum Error {
-    #[error("Guest gave us bad memory addresses.")]
+    /// Guest gave us bad memory addresses.
    GuestMemory(GuestMemoryError),
-    #[error("Guest gave us offsets that would have overflowed a usize.")]
+    /// Guest gave us offsets that would have overflowed a usize.
    CheckedOffset(GuestAddress, usize),
-    #[error("Guest gave us a write only descriptor that protocol says to read from.")]
+    /// Guest gave us a write only descriptor that protocol says to read from.
    UnexpectedWriteOnlyDescriptor,
-    #[error("Guest gave us a read only descriptor that protocol says to write to.")]
+    /// Guest gave us a read only descriptor that protocol says to write to.
    UnexpectedReadOnlyDescriptor,
-    #[error("Guest gave us too few descriptors in a descriptor chain.")]
+    /// Guest gave us too few descriptors in a descriptor chain.
    DescriptorChainTooShort,
-    #[error("Guest gave us a descriptor that was too short to use.")]
+    /// Guest gave us a descriptor that was too short to use.
    DescriptorLengthTooSmall,
-    #[error("Getting a block's metadata fails for any reason.")]
+    /// Getting a block's metadata fails for any reason.
    GetFileMetadata,
-    #[error("The requested operation would cause a seek beyond disk end.")]
+    /// The requested operation would cause a seek beyond disk end.
    InvalidOffset,
-    #[error("The requested operation does not support multiple descriptors.")]
+    /// The requested operation does not support multiple descriptors.
    TooManyDescriptors,
 }

@@ -103,31 +102,20 @@ pub fn build_disk_image_id(disk_path: &Path) -> Vec<u8> {
    default_disk_image_id
 }

-#[derive(Error, Debug)]
+#[derive(Debug)]
 pub enum ExecuteError {
-    #[error("Bad request: {0}")]
    BadRequest(Error),
-    #[error("Falied to flush: {0}")]
    Flush(io::Error),
-    #[error("Failed to read: {0}")]
    Read(GuestMemoryError),
-    #[error("Failed to seek: {0}")]
    Seek(io::Error),
-    #[error("Failed to write: {0}")]
    Write(GuestMemoryError),
-    #[error("Unsupported request: {0}")]
    Unsupported(u32),
-    #[error("Failed to submit io uring: {0}")]
    SubmitIoUring(io::Error),
-    #[error("Failed to get guest address: {0}")]
    GetHostAddress(GuestMemoryError),
-    #[error("Failed to async read: {0}")]
    AsyncRead(AsyncIoError),
-    #[error("Failed to async write: {0}")]
    AsyncWrite(AsyncIoError),
-    #[error("failed to async flush: {0}")]
    AsyncFlush(AsyncIoError),
-    #[error("Failed allocating a temporary buffer: {0}")]
+    /// Failed allocating a temporary buffer.
    TemporaryBufferAllocation(io::Error),
 }

@@ -150,7 +138,7 @@ impl ExecuteError {
    }
 }

-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub enum RequestType {
    In,
    Out,
--- a/devices/Cargo.toml
+++ b/devices/Cargo.toml
@@ -6,22 +6,19 @@ edition = "2021"

 [dependencies]
 acpi_tables = { path = "../acpi_tables" }
-anyhow = "1.0.62"
+anyhow = "1.0.56"
 arch = { path = "../arch" }
 bitflags = "1.3.2"
 byteorder = "1.4.3"
-hypervisor = { path = "../hypervisor" }
-libc = "0.2.131"
-log = "0.4.17"
+epoll = "4.3.1"
+libc = "0.2.123"
+log = "0.4.16"
 versionize = "0.1.6"
 versionize_derive = "0.1.4"
 vm-device = { path = "../vm-device" }
-vm-memory = "0.8.0"
+vm-memory = "0.7.0"
 vm-migration = { path = "../vm-migration" }
-vmm-sys-util = "0.10.0"
-
-[target.'cfg(target_arch = "aarch64")'.dependencies]
-arch = { path = "../arch" }
+vmm-sys-util = "0.9.0"

 [features]
 default = []
--- a/devices/src/gic.rs
+++ b/devices/src/gic.rs
@@ -4,34 +4,30 @@

 use super::interrupt_controller::{Error, InterruptController};
 extern crate arch;
-use anyhow::anyhow;
-use arch::layout;
-use hypervisor::{arch::aarch64::gic::Vgic, CpuState};
+use arch::aarch64::gic::GicDevice;
 use std::result;
 use std::sync::{Arc, Mutex};
 use vm_device::interrupt::{
    InterruptIndex, InterruptManager, InterruptSourceConfig, InterruptSourceGroup,
    LegacyIrqSourceConfig, MsiIrqGroupConfig,
 };
-use vm_memory::Address;
-use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
 use vmm_sys_util::eventfd::EventFd;

 type Result<T> = result::Result<T, Error>;

-// Reserve 32 IRQs for legacy devices.
-pub const IRQ_LEGACY_BASE: usize = layout::IRQ_BASE as usize;
+// Reserve 32 IRQs for legacy device.
+pub const IRQ_LEGACY_BASE: usize = arch::layout::IRQ_BASE as usize;
 pub const IRQ_LEGACY_COUNT: usize = 32;

-// Gic (Generic Interupt Controller) struct provides all the functionality of a
-// GIC device. It wraps a hypervisor-emulated GIC device (Vgic) provided by the
-// `hypervisor` crate.
-// Gic struct also implements InterruptController to provide interrupt delivery
-// service.
+// This Gic struct implements InterruptController to provide interrupt delivery service.
+// The Gic source files in arch/ folder maintain the Aarch64 specific Gic device.
+// The 2 Gic instances could be merged together.
+// Leave this refactoring to future. Two options may be considered:
+//   1. Move Gic*.rs from arch/ folder here.
+//   2. Move this file and ioapic.rs to arch/, as they are architecture specific.
 pub struct Gic {
    interrupt_source_group: Arc<dyn InterruptSourceGroup>,
-    // The hypervisor agnostic virtual GIC
-    vgic: Option<Arc<Mutex<dyn Vgic>>>,
+    gic_device: Option<Arc<Mutex<Box<dyn GicDevice>>>>,
 }

 impl Gic {
@@ -48,32 +44,16 @@ impl Gic {

        Ok(Gic {
            interrupt_source_group,
-            vgic: None,
+            gic_device: None,
        })
    }

-    pub fn create_vgic(
-        &mut self,
-        vm: &Arc<dyn hypervisor::Vm>,
-        vcpu_count: u64,
-    ) -> Result<Arc<Mutex<dyn Vgic>>> {
-        let vgic = vm
-            .create_vgic(
-                vcpu_count,
-                layout::GIC_V3_DIST_START.raw_value(),
-                layout::GIC_V3_DIST_SIZE,
-                layout::GIC_V3_REDIST_SIZE,
-                layout::GIC_V3_ITS_SIZE,
-                layout::IRQ_NUM,
-            )
-            .map_err(Error::CreateGic)?;
-        self.vgic = Some(vgic.clone());
-        Ok(vgic.clone())
+    pub fn set_gic_device(&mut self, gic_device: Arc<Mutex<Box<dyn GicDevice>>>) {
+        self.gic_device = Some(gic_device);
    }

-    pub fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]) {
-        let vgic = self.vgic.as_ref().unwrap().clone();
-        vgic.lock().unwrap().set_gicr_typers(vcpu_states);
+    pub fn get_gic_device(&self) -> Option<&Arc<Mutex<Box<dyn GicDevice>>>> {
+        self.gic_device.as_ref()
    }
 }

@@ -117,43 +97,3 @@ impl InterruptController for Gic {
        self.interrupt_source_group.notifier(irq as InterruptIndex)
    }
 }
-
-pub const GIC_V3_ITS_SNAPSHOT_ID: &str = "gic-v3-its";
-impl Snapshottable for Gic {
-    fn id(&self) -> String {
-        GIC_V3_ITS_SNAPSHOT_ID.to_string()
-    }
-
-    fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
-        let vgic = self.vgic.as_ref().unwrap().clone();
-        let state = vgic.lock().unwrap().state().unwrap();
-        Snapshot::new_from_state(&self.id(), &state)
-    }
-
-    fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
-        let vgic = self.vgic.as_ref().unwrap().clone();
-        vgic.lock()
-            .unwrap()
-            .set_state(&snapshot.to_state(&self.id())?)
-            .map_err(|e| {
-                MigratableError::Restore(anyhow!("Could not restore GICv3ITS state {:?}", e))
-            })?;
-        Ok(())
-    }
-}
-
-impl Pausable for Gic {
-    fn pause(&mut self) -> std::result::Result<(), MigratableError> {
-        // Flush tables to guest RAM
-        let vgic = self.vgic.as_ref().unwrap().clone();
-        vgic.lock().unwrap().save_data_tables().map_err(|e| {
-            MigratableError::Pause(anyhow!(
-                "Could not save GICv3ITS GIC pending tables {:?}",
-                e
-            ))
-        })?;
-        Ok(())
-    }
-}
-impl Transportable for Gic {}
-impl Migratable for Gic {}
--- a/devices/src/interrupt_controller.rs
+++ b/devices/src/interrupt_controller.rs
@@ -24,8 +24,6 @@ pub enum Error {
    UpdateInterrupt(io::Error),
    /// Failed enabling the interrupt.
    EnableInterrupt(io::Error),
-    /// Failed creating GIC device.
-    CreateGic(hypervisor::HypervisorVmError),
 }

 type Result<T> = result::Result<T, Error>;
--- a/devices/src/legacy/debug_port.rs
+++ b/devices/src/legacy/debug_port.rs
@@ -1,86 +0,0 @@
-// Copyright © 2022 Intel Corporation
-//
-// SPDX-License-Identifier: Apache-2.0
-//
-
-use std::fmt;
-use std::time::Instant;
-use vm_device::BusDevice;
-
-/// Debug I/O port, see:
-/// https://www.intel.com/content/www/us/en/support/articles/000005500/boards-and-kits.html
-///
-/// Since we're not a physical platform, we can freely assign code ranges for
-/// debugging specific parts of our virtual platform.
-pub enum DebugIoPortRange {
-    Firmware,
-    Bootloader,
-    Kernel,
-    Userspace,
-    Custom,
-}
-
-#[cfg(target_arch = "x86_64")]
-const DEBUG_IOPORT_PREFIX: &str = "Debug I/O port";
-
-#[cfg(target_arch = "x86_64")]
-impl DebugIoPortRange {
-    fn from_u8(value: u8) -> DebugIoPortRange {
-        match value {
-            0x00..=0x1f => DebugIoPortRange::Firmware,
-            0x20..=0x3f => DebugIoPortRange::Bootloader,
-            0x40..=0x5f => DebugIoPortRange::Kernel,
-            0x60..=0x7f => DebugIoPortRange::Userspace,
-            _ => DebugIoPortRange::Custom,
-        }
-    }
-}
-
-#[cfg(target_arch = "x86_64")]
-impl fmt::Display for DebugIoPortRange {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            DebugIoPortRange::Firmware => write!(f, "{}: Firmware", DEBUG_IOPORT_PREFIX),
-            DebugIoPortRange::Bootloader => write!(f, "{}: Bootloader", DEBUG_IOPORT_PREFIX),
-            DebugIoPortRange::Kernel => write!(f, "{}: Kernel", DEBUG_IOPORT_PREFIX),
-            DebugIoPortRange::Userspace => write!(f, "{}: Userspace", DEBUG_IOPORT_PREFIX),
-            DebugIoPortRange::Custom => write!(f, "{}: Custom", DEBUG_IOPORT_PREFIX),
-        }
-    }
-}
-
-pub struct DebugPort {
-    timestamp: Instant,
-}
-
-impl DebugPort {
-    pub fn new(timestamp: Instant) -> Self {
-        Self { timestamp }
-    }
-}
-
-impl BusDevice for DebugPort {
-    fn read(&mut self, _base: u64, _offset: u64, _data: &mut [u8]) {
-        error!("Invalid read to debug port")
-    }
-
-    fn write(
-        &mut self,
-        _base: u64,
-        _offset: u64,
-        data: &[u8],
-    ) -> Option<std::sync::Arc<std::sync::Barrier>> {
-        let elapsed = self.timestamp.elapsed();
-
-        let code = data[0];
-        warn!(
-            "[{} code 0x{:x}] {}.{:>06} seconds",
-            DebugIoPortRange::from_u8(code),
-            code,
-            elapsed.as_secs(),
-            elapsed.as_micros()
-        );
-
-        None
-    }
-}
--- a/devices/src/legacy/mod.rs
+++ b/devices/src/legacy/mod.rs
@@ -6,8 +6,6 @@
 // found in the LICENSE-BSD-3-Clause file.

 mod cmos;
-#[cfg(target_arch = "x86_64")]
-mod debug_port;
 #[cfg(feature = "fwdebug")]
 mod fwdebug;
 #[cfg(target_arch = "aarch64")]
@@ -20,8 +18,6 @@ mod serial;
 mod uart_pl011;

 pub use self::cmos::Cmos;
-#[cfg(target_arch = "x86_64")]
-pub use self::debug_port::DebugPort;
 #[cfg(feature = "fwdebug")]
 pub use self::fwdebug::FwDebugDevice;
 pub use self::i8042::I8042Device;
--- a/devices/src/legacy/uart_pl011.rs
+++ b/devices/src/legacy/uart_pl011.rs
@@ -10,7 +10,6 @@ use crate::{read_le_u32, write_le_u32};
 use std::collections::VecDeque;
 use std::fmt;
 use std::sync::{Arc, Barrier};
-use std::time::Instant;
 use std::{io, result};
 use versionize::{VersionMap, Versionize, VersionizeResult};
 use versionize_derive::Versionize;
@@ -121,7 +120,6 @@ impl Pl011 {
        id: String,
        irq: Arc<dyn InterruptSourceGroup>,
        out: Option<Box<dyn io::Write + Send>>,
-        timestamp: Instant,
    ) -> Self {
        Self {
            id,
@@ -142,7 +140,7 @@ impl Pl011 {
            read_trigger: 1u32,
            irq,
            out,
-            timestamp,
+            timestamp: std::time::Instant::now(),
        }
    }

@@ -372,7 +370,7 @@ impl BusDevice for Pl011 {
                UARTIFLS => self.ifl,
                UARTIMSC => self.int_enabled,
                UARTRIS => self.int_level,
-                UARTMIS => self.int_level & self.int_enabled,
+                UARTMIS => (self.int_level & self.int_enabled),
                UARTDMACR => self.dmacr,
                UARTDEBUG => self.debug,
                _ => {
@@ -497,7 +495,6 @@ mod tests {
            String::from(SERIAL_NAME),
            Arc::new(TestInterrupt::new(intr_evt.try_clone().unwrap())),
            Some(Box::new(pl011_out.clone())),
-            Instant::now(),
        );

        pl011.write(0, UARTDR as u64, &[b'x', b'y']);
@@ -518,7 +515,6 @@ mod tests {
            String::from(SERIAL_NAME),
            Arc::new(TestInterrupt::new(intr_evt.try_clone().unwrap())),
            Some(Box::new(pl011_out)),
-            Instant::now(),
        );

        // write 1 to the interrupt event fd, so that read doesn't block in case the event fd
--- a/docs/api.md
+++ b/docs/api.md
@@ -1,21 +1,21 @@
 - [Cloud Hypervisor API](#cloud-hypervisor-api)
-  - [External API](#external-api)
-    - [REST API](#rest-api)
-    - [Location and availability](#location-and-availability)
-    - [Endpoints](#endpoints)
-      - [Virtual Machine Manager (VMM) Actions](#virtual-machine-manager-vmm-actions)
-      - [Virtual Machine (VM) Actions](#virtual-machine-vm-actions)
-    - [REST API Examples](#rest-api-examples)
-      - [Create a Virtual Machine](#create-a-virtual-machine)
-      - [Boot a Virtual Machine](#boot-a-virtual-machine)
-      - [Dump a Virtual Machine Information](#dump-a-virtual-machine-information)
-      - [Reboot a Virtual Machine](#reboot-a-virtual-machine)
-      - [Shut a Virtual Machine Down](#shut-a-virtual-machine-down)
-    - [Command Line Interface](#command-line-interface)
-    - [REST API and CLI Architectural Relationship](#rest-api-and-cli-architectural-relationship)
-  - [Internal API](#internal-api)
-    - [Goals and Design](#goals-and-design)
-  - [End to End Example](#end-to-end-example)
+  * [External API](#external-api)
+    + [REST API](#rest-api)
+      - [Location and availability](#location-and-availability)
+      - [Endpoints](#endpoints)
+		* [Virtual Machine Manager (VMM) Actions](#virtual-machine-manager-vmm-actions)
+		* [Virtual Machine (VM) Actions](#virtual-machine-vm-actions)
+      - [REST API Examples](#rest-api-examples)
+        * [Create a Virtual Machine](#create-a-virtual-machine)
+	    * [Boot a Virtual Machine](#boot-a-virtual-machine)
+        * [Dump a Virtual Machine Information](#dump-a-virtual-machine-information)
+        * [Reboot a Virtual Machine](#reboot-a-virtual-machine)
+        * [Shut a Virtual Machine Down](#shut-a-virtual-machine-down)
+    + [Command Line Interface](#command-line-interface)
+    + [REST API and CLI Architectural Relationship](#rest-api-and-cli-architectural-relationship)
+  * [Internal API](#internal-api)
+    + [Goals and Design](#goals-and-design)
+  * [End to End Example](#end-to-end-example)

 # Cloud Hypervisor API

@@ -71,40 +71,39 @@ The Cloud Hypervisor API exposes the following actions through its endpoints:

 #### Virtual Machine Manager (VMM) Actions

-| Action                              | Endpoint        | Request Body | Response Body              | Prerequisites      |
-| ----------------------------------- | --------------- | ------------ | -------------------------- | ------------------ |
-| Check for the REST API availability | `/vmm.ping`     | N/A          | `/schemas/VmmPingResponse` | N/A                |
-| Shut the VMM down                   | `/vmm.shutdown` | N/A          | N/A                        | The VMM is running |
+Action                              | Endpoint        | Request Body | Response Body              | Prerequisites
+------------------------------------|-----------------|--------------|----------------------------|---------------------------
+Check for the REST API availability | `/vmm.ping`     | N/A          | `/schemas/VmmPingResponse` | N/A
+Shut the VMM down                   | `/vmm.shutdown` | N/A          | N/A                        | The VMM is running

 #### Virtual Machine (VM) Actions

-| Action                             | Endpoint              | Request Body                | Response Body            | Prerequisites                    |
-| ---------------------------------- | --------------------- | --------------------------- | ------------------------ | -------------------------------- |
-| Create the VM                      | `/vm.create`          | `/schemas/VmConfig`         | N/A                      | The VM is not created yet        |
-| Delete the VM                      | `/vm.delete`          | N/A                         | N/A                      | N/A                              |
-| Boot the VM                        | `/vm.boot`            | N/A                         | N/A                      | The VM is created but not booted |
-| Shut the VM down                   | `/vm.shutdown`        | N/A                         | N/A                      | The VM is booted                 |
-| Reboot the VM                      | `/vm.reboot`          | N/A                         | N/A                      | The VM is booted                 |
-| Trigger power button of the VM     | `/vm.power-button`    | N/A                         | N/A                      | The VM is booted                 |
-| Pause the VM                       | `/vm.pause`           | N/A                         | N/A                      | The VM is booted                 |
-| Resume the VM                      | `/vm.resume`          | N/A                         | N/A                      | The VM is paused                 |
-| Task a snapshot of the VM          | `/vm.snapshot`        | `/schemas/VmSnapshotConfig` | N/A                      | The VM is paused                 |
-| Perform a coredump of the VM       | `/vm.coredump`        | `/schemas/VmCoredumpData`   | N/A                      | The VM is paused                 |
-| Restore the VM from a snapshot     | `/vm.restore`         | `/schemas/RestoreConfig`    | N/A                      | The VM is created but not booted |
-| Add/remove CPUs to/from the VM     | `/vm.resize`          | `/schemas/VmResize`         | N/A                      | The VM is booted                 |
-| Add/remove memory from the VM      | `/vm.resize`          | `/schemas/VmResize`         | N/A                      | The VM is booted                 |
-| Add/remove memory from a zone      | `/vm.resize-zone`     | `/schemas/VmResizeZone`     | N/A                      | The VM is booted                 |
-| Dump the VM information            | `/vm.info`            | N/A                         | `/schemas/VmInfo`        | The VM is created                |
-| Add VFIO PCI device to the VM      | `/vm.add-device`      | `/schemas/VmAddDevice`      | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add disk device to the VM          | `/vm.add-disk`        | `/schemas/DiskConfig`       | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add fs device to the VM            | `/vm.add-fs`          | `/schemas/FsConfig`         | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add pmem device to the VM          | `/vm.add-pmem`        | `/schemas/PmemConfig`       | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add network device to the VM       | `/vm.add-net`         | `/schemas/NetConfig`        | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add userspace PCI device to the VM | `/vm.add-user-device` | `/schemas/VmAddUserDevice`  | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add vdpa device to the VM          | `/vm.add-vdpa`        | `/schemas/VdpaConfig`       | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Add vsock device to the VM         | `/vm.add-vsock`       | `/schemas/VsockConfig`      | `/schemas/PciDeviceInfo` | The VM is booted                 |
-| Remove device from the VM          | `/vm.remove-device`   | `/schemas/VmRemoveDevice`   | N/A                      | The VM is booted                 |
-| Dump the VM counters               | `/vm.counters`        | N/A                         | `/schemas/VmCounters`    | The VM is booted                 |
+Action                             | Endpoint             | Request Body              | Response Body            | Prerequisites
+-----------------------------------|----------------------|---------------------------|--------------------------|---------------------------
+Create the VM                      | `/vm.create`         | `/schemas/VmConfig`       | N/A                      | The VM is not created yet
+Delete the VM                      | `/vm.delete`         | N/A                       | N/A                      | N/A
+Boot the VM                        | `/vm.boot`           | N/A                       | N/A                      | The VM is created but not booted
+Shut the VM down                   | `/vm.shutdown`       | N/A                       | N/A                      | The VM is booted
+Reboot the VM                      | `/vm.reboot`         | N/A                       | N/A                      | The VM is booted
+Trigger power button of the VM     | `/vm.power-button`   | N/A                       | N/A                      | The VM is booted
+Pause the VM                       | `/vm.pause`          | N/A                       | N/A                      | The VM is booted
+Resume the VM                      | `/vm.resume`         | N/A                       | N/A                      | The VM is paused
+Task a snapshot of the VM          | `/vm.snapshot`       | `/schemas/VmSnapshotConfig`| N/A                     | The VM is paused
+Restore the VM from a snapshot     | `/vm.restore`        | `/schemas/RestoreConfig`  | N/A                      | The VM is created but not booted
+Add/remove CPUs to/from the VM     | `/vm.resize`         | `/schemas/VmResize`       | N/A                      | The VM is booted
+Add/remove memory from the VM      | `/vm.resize`         | `/schemas/VmResize`       | N/A                      | The VM is booted
+Add/remove memory from a zone      | `/vm.resize-zone`    | `/schemas/VmResizeZone`   | N/A                      | The VM is booted
+Dump the VM information            | `/vm.info`           | N/A                       | `/schemas/VmInfo`        | The VM is created
+Add VFIO PCI device to the VM      | `/vm.add-device`     | `/schemas/VmAddDevice`    | `/schemas/PciDeviceInfo` | The VM is booted
+Add disk device to the VM          | `/vm.add-disk`       | `/schemas/DiskConfig`     | `/schemas/PciDeviceInfo` | The VM is booted
+Add fs device to the VM            | `/vm.add-fs`         | `/schemas/FsConfig`       | `/schemas/PciDeviceInfo` | The VM is booted
+Add pmem device to the VM          | `/vm.add-pmem`       | `/schemas/PmemConfig`     | `/schemas/PciDeviceInfo` | The VM is booted
+Add network device to the VM       | `/vm.add-net`        | `/schemas/NetConfig`      | `/schemas/PciDeviceInfo` | The VM is booted
+Add userspace PCI device to the VM | `/vm.add-user-device`| `/schemas/VmAddUserDevice`| `/schemas/PciDeviceInfo` | The VM is booted
+Add vdpa device to the VM          | `/vm.add-vdpa`       | `/schemas/VdpaConfig`     | `/schemas/PciDeviceInfo` | The VM is booted
+Add vsock device to the VM         | `/vm.add-vsock`      | `/schemas/VsockConfig`    | `/schemas/PciDeviceInfo` | The VM is booted
+Remove device from the VM          | `/vm.remove-device`  | `/schemas/VmRemoveDevice` | N/A                      | The VM is booted
+Dump the VM counters               | `/vm.counters`       | N/A                       | `/schemas/VmCounters`    | The VM is booted

 ### REST API Examples

@@ -143,7 +142,8 @@ curl --unix-socket /tmp/cloud-hypervisor.sock -i \
     -H 'Content-Type: application/json'         \
     -d '{
         "cpus":{"boot_vcpus": 4, "max_vcpus": 4},
-         "payload":{"kernel":"/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu", "cmdline":"console=ttyS0 console=hvc0 root=/dev/vda1 rw"},
+         "kernel":{"path":"/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu"},
+         "cmdline":{"args":"console=ttyS0 console=hvc0 root=/dev/vda1 rw"},
         "disks":[{"path":"/opt/clh/images/focal-server-cloudimg-amd64.raw"}],
         "rng":{"src":"/dev/urandom"},
         "net":[{"ip":"192.168.10.10", "mask":"255.255.255.0", "mac":"12:34:56:78:90:01"}]
@@ -310,7 +310,8 @@ APIs work together, let's look at a complete VM creation flow, from the
 		-H 'Content-Type: application/json'         \
 		-d '{
 			"cpus":{"boot_vcpus": 4, "max_vcpus": 4},
-			"payload":{"kernel":"/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu", "cmdline":"console=ttyS0 console=hvc0 root=/dev/vda1 rw"},
+			"kernel":{"path":"/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu"},
+			"cmdline":{"args":"console=ttyS0 console=hvc0 root=/dev/vda1 rw"},
 			"disks":[{"path":"/opt/clh/images/focal-server-cloudimg-amd64.raw"}],
 			"rng":{"src":"/dev/urandom"},
 			"net":[{"ip":"192.168.10.10", "mask":"255.255.255.0", "mac":"12:34:56:78:90:01"}]
--- a/docs/custom-image.md
+++ b/docs/custom-image.md
@@ -59,16 +59,6 @@ mkdir -p /mnt
 sudo mount -o loop,offset=$((227328 * 512)) focal-server-cloudimg-amd64.raw /mnt
 ```

-### Set up DNS
-
-The next step describes changing the root directory to the rootfs contained by 
-the cloud image. For DNS to work in the root directory, you will need to first bind-mount 
-the host `/etc/resolv.conf` onto the mounted linux partition of the cloud image.
-
-```bash
-sudo mount -o bind /etc/resolv.conf /mnt/etc/resolv.conf
-```
-
 ### Change root directory

 Changing the root directory will allow us to install new packages to the rootfs
@@ -118,7 +108,6 @@ umount /dev/pts
 umount /proc
 history -c
 exit
-umount /mnt/etc/resolv.conf
 umount /mnt
 ```

--- a/docs/device_model.md
+++ b/docs/device_model.md
@@ -6,22 +6,22 @@ This document describes the device model supported by `cloud-hypervisor`.

 | Device | Build configurable | Enabled by default | Runtime configurable |
 | :----: | :----: | :----: | :----: |
-| Serial port | :x: | :x: | :heavy_check_mark: |
-| RTC/CMOS | :heavy_check_mark: | :heavy_check_mark: | :x: |
-| I/O APIC | :x: | :x: | :heavy_check_mark: |
-| i8042 shutdown/reboot | :x: | :x: | :x: |
-| ACPI shutdown/reboot | :x: | :heavy_check_mark: | :x: |
-| virtio-blk | :x: | :x: | :heavy_check_mark: |
-| virtio-console | :x: | :x: | :heavy_check_mark: |
-| virtio-iommu | :x: | :x: | :heavy_check_mark: |
-| virtio-net | :x: | :x: | :heavy_check_mark: |
-| virtio-pmem | :x: | :x: | :heavy_check_mark: |
-| virtio-rng | :x: | :x: | :heavy_check_mark: |
-| virtio-vsock | :x: | :x: | :heavy_check_mark: |
-| vhost-user-blk | :x: | :x: | :heavy_check_mark: |
-| vhost-user-fs | :x: | :x: | :heavy_check_mark: |
-| vhost-user-net | :x: | :x: | :heavy_check_mark: |
-| VFIO | :heavy_check_mark: | :x: | :heavy_check_mark: |
+| Serial port | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| RTC/CMOS | :heavy_check_mark: | :heavy_check_mark: | :negative_squared_cross_mark: |
+| I/O APIC | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| i8042 shutdown/reboot | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :negative_squared_cross_mark: |
+| ACPI shutdown/reboot | :negative_squared_cross_mark: | :heavy_check_mark: | :negative_squared_cross_mark: |
+| virtio-blk | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| virtio-console | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| virtio-iommu | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| virtio-net | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| virtio-pmem | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| virtio-rng | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| virtio-vsock | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| vhost-user-blk | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| vhost-user-fs | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| vhost-user-net | :negative_squared_cross_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |
+| VFIO | :heavy_check_mark: | :negative_squared_cross_mark: | :heavy_check_mark: |

 ## Legacy devices

--- a/docs/fs.md
+++ b/docs/fs.md
@@ -29,11 +29,10 @@ mkdir /tmp/shared_dir
 _Run virtiofsd_
 ```bash
 ./virtiofsd \
-    --log-level debug \
+    -d \
    --socket-path=/tmp/virtiofs \
    --shared-dir=/tmp/shared_dir \
-    --cache=never \
-    --thread-pool-size=$N
+    --cache=never
 ```

 The `cache=never` option is the default when using `virtiofsd` with
@@ -45,10 +44,6 @@ The `cache=always` option will allow the host page cache to be used, which can
 result in better performance for the guest's workload at the cost of increasing
 the footprint on host memory.

-The `thread-pool-size` option controls how many IO threads are spawned. For
-very fast storage like NVMe spawning enough worker threads is critical to
-getting an acceptable performance compared to native.
-
 ### Kernel support

 Modern Linux kernels (at least v5.10) have support for virtio-fs. Use of older
@@ -95,4 +90,4 @@ Cloud Hypervisor command line, which happens to be `myfs` in this example.
 ## DAX feature

 Given the DAX feature is not stable yet from a daemon standpoint, it is not
-available in Cloud Hypervisor.
+available in Cloud Hypervisor.
--- a/docs/intel_tdx.md
+++ b/docs/intel_tdx.md
@@ -103,18 +103,8 @@ option as well.
    --disk path=tdx_guest_img
 ```

-### Guest kernel limitations
-
-#### Serial ports disabled
+### Guest kernel disables serial ports

 The latest guest kernel that can be found in the latest image
 `td-guest-rhel8.5.raw` disabled the support for serial ports. This means adding
-`console=ttyS0` will have no effect and will not print any log from the guest.
-
-#### PCI hotplug through ACPI
-
-Unless you run the guest kernel with the parameter `tdx_disable_filter`, ACPI
-devices responsible for handling PCI hotplug (PCI hotplug controller, PCI
-Express Bus and Generic Event Device) will not be allowed, therefore the
-corresponding drivers will not be loaded and the PCI hotplug feature will not
-be supported.
+`console=ttyS0` will have no effect and will not print any log from the guest.
--- a/docs/profiling.md
+++ b/docs/profiling.md
@@ -43,22 +43,3 @@ $ perf report -g
 ```

 If profiling with a network device attached either the TAP device must be already created and configured or the profiling must be done as root so that the TAP device can be created.
-
-## Userspace only profiling with LBR
-
-The use of LBR (Last Branch Record; available since Haswell) offers lower
-overhead if only userspace profiling is required. This lower overhead can allow
-a higher frequency of sampling. This also removes the requirement to compile
-with custom `RUSTFLAGS` however debug symbols should still be included:
-
-e.g.
-
-```
-$ perf record --call-graph lbr --all-user --user-callchains -g target/release/cloud-hypervisor \
-        --kernel ~/src/linux/vmlinux \
-        --pmem file=~/workloads/focal.raw \
-        --cpus boot=1 --memory size=1G \
-        --cmdline "root=/dev/pmem0p1 console=ttyS0" \
-        --serial tty --console off \
-        --api-socket=/tmp/api1
-```
--- a/docs/releases.md
+++ b/docs/releases.md
@@ -1,103 +0,0 @@
-# Release Documentation
-
-## Abstract
-
-This document provides guidance to users, downstream maintainers and
-any other consumers of the Cloud Hypervisor project, this document
-describes the release process, release cadence, stability expectations and
-related topics.
-
-## Basic Terms
-
-### Stability
-
-For Cloud Hypervisor the following areas are subject to stability guarantees:
-
- [REST API](api.md#rest-api)
- [Command line options](api.md#command-line-interface)
- [Device Model](device_model.md)
- Device tree, device list, ACPI, Hyper-V enlightenments and any other
-  features exposed to guest
- KVM compatibility
- Rust edition compatibility
-
-This list is incomplete but this document serves as a best effort guide to stability
-across releases.
-
-### Experimental features
-
-Experimental features are under active development and no guarantees are made about their stability.
-
-List of experimental features:
-
- TDX
- vfio-user
- vDPA
-
-### Security
-
-Security fixes should be included in a new point release.
-
-For security issues an advisory will be published via the GitHub security advisory process along with the release. Watching the project on GitHub will notify you of those issues.
-
-## Releases
-
-### Versioning
-
-The versioning scheme uses `MAJOR.POINT` pattern:
-
- `MAJOR` can introduce incompatible changes along with support for new features. Changes to the [API](api.md#rest-api),
-  [CLI options](api.md#command-line-interface) and [device model](device_model.md)
-  require a notice at least 2 releases in advance for the actual change to take
-  place.
- `POINT` contains bug fixes and/or security fixes.
-
-### Major Release Cadence
-
-Cloud Hypervisor is under active development. A new major release is issued approximately
-every 6 weeks. Point releases are issued on demand, when important bug fixes are in
-the queue. A major release would receive bug fixes for the next two cycles (~12 weeks)
-and then be considered EOL.
-
-```
-+ - Active release support
-E - EOL
-
-        2021                2022                2023 
-         |    |    |    |    |    |    |    |    | 
-18.0     |    |    |  ++++++++E
-19.0     |    |    |    |++++++++E
-20.0     |    |    |    |   ++++++++E
-21.0     |    |    |    |    | ++++++++E
-22.0     |    |    |    |    |    +++++++++E
-23.0     |    |    |    |    |    |  +++++++++E
-
-```
-
-### Major Release Stability Considerations
-
-Snapshot/restore support is not compatible across `MAJOR` versions.
-Live migration support is not compatible across `MAJOR` versions.
-
-### LTS Release Cadence
-
-A regular release is promoted to LTS every 12 months. An LTS release is supported for 18 months. This gives a 6 months window for users to move to the new LTS.
-
-```
-+ - Active release support
-E - EOL
-
-        2022                2023               2024                 2025                2026
-         |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |    |
-23.0     |    |+++++++++++++++++++++++++++++E
-43.0     |    |    |    |    |    |+++++++++++++++++++++++++++++E
-63.0     |    |    |    |    |    |    |    |    |    |+++++++++++++++++++++++++++++E
-
-```
-
-### LTS Stablity Considerations
-
-An LTS release is just a `MAJOR` release for which point releases are made for
-longer following the same rules for what can be backported to a `POINT` release.
-The focus lays on critical and security bug fixes which are pulled at the
-maintainer's discretion.
--- a/docs/vhost-user-net-testing.md
+++ b/docs/vhost-user-net-testing.md
@@ -75,7 +75,8 @@ Here is an example how to create a bridge and add two DPDK ports to it
 ovs-vsctl add-br ovsbr0 -- set bridge ovsbr0 datapath_type=netdev
 # create two DPDK ports and add them to the bridge
 ovs-vsctl add-port ovsbr0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser
-ovs-vsctl add-port ovsbr0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser
+ovs-vsctl add-port ovsbr0 vhost-user2 -- set Interface vhost-user2
+type=dpdkvhostuser
 # set the number of rx queues
 ovs-vsctl set Interface vhost-user1 options:n_rxq=2
 ovs-vsctl set Interface vhost-user2 options:n_rxq=2
--- a/event_monitor/Cargo.toml
+++ b/event_monitor/Cargo.toml
@@ -5,6 +5,7 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2021"

 [dependencies]
-libc = "0.2.131"
-serde = { version = "1.0.143", features = ["rc", "derive"] }
-serde_json = "1.0.83"
+libc = "0.2.123"
+serde = { version = "1.0.136", features = ["rc"] }
+serde_derive = "1.0.136"
+serde_json = "1.0.79"
--- a/event_monitor/src/lib.rs
+++ b/event_monitor/src/lib.rs
@@ -3,11 +3,12 @@
 // SPDX-License-Identifier: Apache-2.0
 //

-use serde::Serialize;
+#[macro_use]
+extern crate serde_derive;
+
 use std::borrow::Cow;
 use std::collections::HashMap;
 use std::fs::File;
-use std::io::Write;
 use std::os::unix::io::AsRawFd;
 use std::time::{Duration, Instant};

@@ -49,9 +50,6 @@ pub fn event_log(source: &str, event: &str, properties: Option<&HashMap<Cow<str>
            properties,
        };
        serde_json::to_writer_pretty(file, &e).ok();
-
-        let mut file = file;
-        file.write_all(b"\n\n").ok();
    }
 }

--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -11,9 +11,9 @@ dependencies = [

 [[package]]
 name = "anyhow"
-version = "1.0.62"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1485d4d2cc45e7b201ee3767015c96faa5904387c9d87c6efdd0fb511f12d305"
+checksum = "4361135be9122e0870de935d7c439aef945b9f9ddd4199a553b5270b49c82a27"

 [[package]]
 name = "api_client"
@@ -24,20 +24,21 @@ dependencies = [

 [[package]]
 name = "arbitrary"
-version = "1.1.3"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a7924531f38b1970ff630f03eb20a2fde69db5c590c93b0f3482e95dcc5fd60"
+checksum = "c38b6b6b79f671c25e1a3e785b7b82d7562ffc9cd3efdc98627e5668a2472490"

 [[package]]
 name = "arc-swap"
-version = "1.5.1"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "983cd8b9d4b02a6dc6ffa557262eb5858a27a0038ffffe21a0f133eaa819a164"
+checksum = "c5d78ce20460b82d3fa150275ed9d55e21064fc7951177baacf86a145c4a4b1f"

 [[package]]
 name = "arch"
 version = "0.1.0"
 dependencies = [
+ "acpi_tables",
 "anyhow",
 "byteorder",
 "fdt",
@@ -46,8 +47,8 @@ dependencies = [
 "linux-loader",
 "log",
 "serde",
+ "serde_derive",
 "thiserror",
- "uuid",
 "versionize",
 "versionize_derive",
 "vm-fdt",
@@ -127,33 +128,24 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"

 [[package]]
 name = "clap"
-version = "3.2.17"
+version = "3.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29e724a68d9319343bb3328c9cc2dfde263f4b3142ee1059a9980580171c954b"
+checksum = "71c47df61d9e16dc010b55dba1952a57d8c215dbb533fd13cdd13369aac73b1c"
 dependencies = [
 "atty",
 "bitflags",
- "clap_lex",
 "indexmap",
- "once_cell",
+ "lazy_static",
+ "os_str_bytes",
 "strsim",
 "termcolor",
 "terminal_size",
 "textwrap",
 ]

-[[package]]
-name = "clap_lex"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
-dependencies = [
- "os_str_bytes",
-]
-
 [[package]]
 name = "cloud-hypervisor"
-version = "25.0.0"
+version = "22.0.0"
 dependencies = [
 "anyhow",
 "api_client",
@@ -179,21 +171,15 @@ version = "0.0.0"
 dependencies = [
 "block_util",
 "cloud-hypervisor",
- "devices",
- "epoll",
 "libc",
 "libfuzzer-sys",
- "micro_http",
- "once_cell",
 "qcow",
 "seccompiler",
 "vhdx",
 "virtio-devices",
 "virtio-queue",
- "vm-device",
 "vm-memory",
 "vm-virtio",
- "vmm",
 "vmm-sys-util",
 ]

@@ -212,41 +198,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55626594feae15d266d52440b26ff77de0e22230cf0c113abe619084c1ddc910"

-[[package]]
-name = "darling"
-version = "0.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4529658bdda7fd6769b8614be250cdcfc3aeb0ee72fe66f9e41e5e5eb73eac02"
-dependencies = [
- "darling_core",
- "darling_macro",
-]
-
-[[package]]
-name = "darling_core"
-version = "0.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "649c91bc01e8b1eac09fb91e8dbc7d517684ca6be8ebc75bb9cafc894f9fdb6f"
-dependencies = [
- "fnv",
- "ident_case",
- "proc-macro2",
- "quote",
- "strsim",
- "syn",
-]
-
-[[package]]
-name = "darling_macro"
-version = "0.14.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddfc69c5bfcbd2fc09a0f38451d2daf0e372e367986a83906d1b0dbc88134fb5"
-dependencies = [
- "darling_core",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "devices"
 version = "0.1.0"
@@ -256,7 +207,7 @@ dependencies = [
 "arch",
 "bitflags",
 "byteorder",
- "hypervisor",
+ "epoll",
 "libc",
 "log",
 "versionize",
@@ -283,26 +234,45 @@ version = "0.1.0"
 dependencies = [
 "libc",
 "serde",
+ "serde_derive",
 "serde_json",
 ]

 [[package]]
 name = "fdt"
-version = "0.1.4"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "964f5becd44d069dca0beea2b4bc05639ae7bf3b3f5369c295aff360bb57cca2"
+checksum = "b643857cf70949306b81d7e92cb9d47add673868edac9863c4a49c42feaf3f1e"

 [[package]]
-name = "fnv"
-version = "1.0.7"
+name = "gdbstub"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+checksum = "9fa2ca5d6b045de372cef3991f873389b421b4cabcfbe52f7787fae8b8b37906"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "log",
+ "managed",
+ "num-traits",
+ "paste",
+]
+
+[[package]]
+name = "gdbstub_arch"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "51dc4b5718ac76d21e8605c0966dd32d80273b89b11e6cfef467b04e45934d37"
+dependencies = [
+ "gdbstub",
+ "num-traits",
+]

 [[package]]
 name = "getrandom"
-version = "0.2.7"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
+checksum = "9be70c98951c83b8d2f8f60d7065fa6d5146873094452a1008da8c2f1e4205ad"
 dependencies = [
 "cfg-if",
 "libc",
@@ -311,9 +281,9 @@ dependencies = [

 [[package]]
 name = "hashbrown"
-version = "0.12.3"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"

 [[package]]
 name = "hermit-abi"
@@ -329,16 +299,16 @@ name = "hypervisor"
 version = "0.1.0"
 dependencies = [
 "anyhow",
- "byteorder",
+ "epoll",
 "iced-x86",
 "kvm-bindings",
 "kvm-ioctls",
 "libc",
 "log",
 "serde",
- "serde_with",
+ "serde_derive",
+ "serde_json",
 "thiserror",
- "vfio-ioctls",
 "vm-memory",
 "vmm-sys-util",
 ]
@@ -353,17 +323,11 @@ dependencies = [
 "static_assertions",
 ]

-[[package]]
-name = "ident_case"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
-
 [[package]]
 name = "indexmap"
-version = "1.9.1"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
+checksum = "0f647032dfaa1f8b6dc29bd3edb7bbef4861b8b8007ebb118d6db284fd59f6ee"
 dependencies = [
 "autocfg",
 "hashbrown",
@@ -371,9 +335,9 @@ dependencies = [

 [[package]]
 name = "io-uring"
-version = "0.5.3"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "427496d698429d86ff947537dff68facb83fe753b7abea4fab4ac1c4b7a4b94b"
+checksum = "8d75829ed9377bab6c90039fe47b9d84caceb4b5063266142e21bcce6550cda8"
 dependencies = [
 "bitflags",
 "libc",
@@ -381,9 +345,9 @@ dependencies = [

 [[package]]
 name = "itoa"
-version = "1.0.3"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8af84674fe1f223a982c933a0ee1086ac4d4052aa0fb8060c12c6ad838e754"
+checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"

 [[package]]
 name = "kvm-bindings"
@@ -413,9 +377,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"

 [[package]]
 name = "libc"
-version = "0.2.131"
+version = "0.2.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04c3b4822ccebfa39c02fc03d1534441b22ead323fa0f48bb7ddd8e6ba076a40"
+checksum = "cb691a747a7ab48abc15c5b42066eaafde10dc427e3b6ee2a1cf43db04c763bd"

 [[package]]
 name = "libfuzzer-sys"
@@ -439,17 +403,29 @@ dependencies = [

 [[package]]
 name = "log"
-version = "0.4.17"
+version = "0.4.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
+checksum = "6389c490849ff5bc16be905ae24bc913a9c8892e19b2341dbc175e14c341c2b8"
 dependencies = [
 "cfg-if",
 ]

+[[package]]
+name = "managed"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ca88d725a0a943b096803bd34e73a4437208b6077654cc4ecb2947a5f91618d"
+
+[[package]]
+name = "memchr"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+
 [[package]]
 name = "micro_http"
 version = "0.1.0"
-source = "git+https://github.com/firecracker-microvm/micro-http?branch=main#863b0370ba7e57f7df5b908ada9e5b44809ccae9"
+source = "git+https://github.com/firecracker-microvm/micro-http?branch=main#9517a300370a158a7af0996b7eebf040d171e1a4"
 dependencies = [
 "libc",
 "vmm-sys-util",
@@ -473,7 +449,6 @@ dependencies = [
 "net_gen",
 "rate_limiter",
 "serde",
- "thiserror",
 "versionize",
 "versionize_derive",
 "virtio-bindings",
@@ -484,10 +459,19 @@ dependencies = [
 ]

 [[package]]
-name = "once_cell"
-version = "1.13.1"
+name = "num-traits"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "074864da206b4973b84eb91683020dbefd6a8c3f0f38e054d93954e891935e4e"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"

 [[package]]
 name = "option_parser"
@@ -495,9 +479,18 @@ version = "0.1.0"

 [[package]]
 name = "os_str_bytes"
-version = "6.3.0"
+version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ff7415e9ae3fff1225851df9e0d9e4e5479f947619774677a63572e55e80eff"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "paste"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c520e05135d6e763148b6426a837e239041653ba7becd2e538c076c738025fc"

 [[package]]
 name = "pci"
@@ -509,6 +502,7 @@ dependencies = [
 "libc",
 "log",
 "serde",
+ "serde_derive",
 "thiserror",
 "versionize",
 "versionize_derive",
@@ -524,11 +518,11 @@ dependencies = [

 [[package]]
 name = "proc-macro2"
-version = "1.0.43"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a2ca2c61bc9f3d74d2886294ab7b9853abd9c1ad903a3ac7815c58989bb7bab"
+checksum = "ec757218438d5fda206afc041538b2f6d889286160d649a86a24d37e1235afd1"
 dependencies = [
- "unicode-ident",
+ "unicode-xid",
 ]

 [[package]]
@@ -544,9 +538,9 @@ dependencies = [

 [[package]]
 name = "quote"
-version = "1.0.21"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
+checksum = "a1feb54ed693b93a84e14094943b84b7c4eae204c512b7ccb95ab0c66d278ad1"
 dependencies = [
 "proc-macro2",
 ]
@@ -562,9 +556,9 @@ dependencies = [

 [[package]]
 name = "remain"
-version = "0.2.4"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06df529c0d271b27ac4a2c260f5ce2914b60bd44702cecec7b9f271adbdde23b"
+checksum = "70ba1e78fa68412cb93ef642fd4d20b9a941be49ee9333875ebaf13112673ea7"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -582,9 +576,9 @@ dependencies = [

 [[package]]
 name = "ryu"
-version = "1.0.11"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
+checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"

 [[package]]
 name = "seccompiler"
@@ -597,24 +591,21 @@ dependencies = [

 [[package]]
 name = "semver"
-version = "1.0.13"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93f6841e709003d68bb2deee8c343572bf446003ec20a583e76f7b15cebf3711"
+checksum = "d65bd28f48be7196d222d95b9243287f48d27aca604e08497513019ff0502cc4"

 [[package]]
 name = "serde"
-version = "1.0.143"
+version = "1.0.136"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53e8e5d5b70924f74ff5c6d64d9a5acd91422117c60f48c4e07855238a254553"
-dependencies = [
- "serde_derive",
-]
+checksum = "ce31e24b01e1e524df96f1c2fdd054405f8d7376249a5110886fb4b658484789"

 [[package]]
 name = "serde_derive"
-version = "1.0.143"
+version = "1.0.136"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3d8e8de557aee63c26b85b947f5e59b690d0454c753f3adeb5cd7835ab88391"
+checksum = "08597e7152fcd306f41838ed3e37be9eaeed2b61c42e2117266a554fab4662f9"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -623,42 +614,20 @@ dependencies = [

 [[package]]
 name = "serde_json"
-version = "1.0.83"
+version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38dd04e3c8279e75b31ef29dbdceebfe5ad89f4d0937213c53f7d49d01b3d5a7"
+checksum = "8e8d9fa5c3b304765ce1fd9c4c8a3de2c8db365a5b91be52f186efc675681d95"
 dependencies = [
 "itoa",
 "ryu",
 "serde",
 ]

-[[package]]
-name = "serde_with"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89df7a26519371a3cce44fbb914c2819c84d9b897890987fa3ab096491cc0ea8"
-dependencies = [
- "serde",
- "serde_with_macros",
-]
-
-[[package]]
-name = "serde_with_macros"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de337f322382fcdfbb21a014f7c224ee041a23785651db67b9827403178f698f"
-dependencies = [
- "darling",
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "signal-hook"
-version = "0.3.14"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a253b5e89e2698464fc26b545c9edceb338e18a89effeeecfea192c3025be29d"
+checksum = "647c97df271007dcea485bb74ffdb57f2e683f1306c854f468a0c244badabf2d"
 dependencies = [
 "libc",
 "signal-hook-registry",
@@ -687,13 +656,13 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"

 [[package]]
 name = "syn"
-version = "1.0.99"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58dbef6ec655055e20b86b15a8cc6d439cca19b667537ac6a1369572d151ab13"
+checksum = "b683b2b825c8eef438b77c36a06dc262294da3d5a5813fac20da149241dcd44d"
 dependencies = [
 "proc-macro2",
 "quote",
- "unicode-ident",
+ "unicode-xid",
 ]

 [[package]]
@@ -726,18 +695,18 @@ dependencies = [

 [[package]]
 name = "thiserror"
-version = "1.0.32"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f5f6586b7f764adc0231f4c79be7b920e766bb2f3e51b3661cdb263828f19994"
+checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417"
 dependencies = [
 "thiserror-impl",
 ]

 [[package]]
 name = "thiserror-impl"
-version = "1.0.32"
+version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12bafc5b54507e0149cdf1b145a5d80ab80a90bcd9275df43d4fff68460f6c21"
+checksum = "aa32fd3f627f367fe16f893e2597ae3c05020f8bba2666a4e6ea73d377e5714b"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -745,16 +714,16 @@ dependencies = [
 ]

 [[package]]
-name = "unicode-ident"
-version = "1.0.3"
+name = "unicode-xid"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

 [[package]]
 name = "uuid"
-version = "1.1.2"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd6469f4314d5f1ffec476e05f17cc9a78bc7a27a6a857842170bdf8d6f98d2f"
+checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
 dependencies = [
 "getrandom",
 ]
@@ -798,7 +767,7 @@ dependencies = [
 [[package]]
 name = "vfio-ioctls"
 version = "0.1.0"
-source = "git+https://github.com/rust-vmm/vfio?branch=main#1ff2324e5cb0fccab825f9c96bb9387a1a01863f"
+source = "git+https://github.com/rust-vmm/vfio?branch=main#4630612f2ff300e78b6d55be324fb5481aa84661"
 dependencies = [
 "byteorder",
 "kvm-bindings",
@@ -815,6 +784,7 @@ dependencies = [
 name = "vfio_user"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
 "libc",
 "log",
 "serde",
@@ -837,6 +807,7 @@ dependencies = [
 "remain",
 "thiserror",
 "uuid",
+ "vmm-sys-util",
 ]

 [[package]]
@@ -876,6 +847,7 @@ dependencies = [
 "rate_limiter",
 "seccompiler",
 "serde",
+ "serde_derive",
 "serde_json",
 "thiserror",
 "versionize",
@@ -893,12 +865,11 @@ dependencies = [

 [[package]]
 name = "virtio-queue"
-version = "0.5.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4f59652909f276e6edd8bf36e9f106480b2202f5f046717b3de14f1b4072a28"
+checksum = "3785325315e6496fa88673842ee6cd198b9658e88e8b0e1ad48a5dc818b221dc"
 dependencies = [
 "log",
- "virtio-bindings",
 "vm-memory",
 "vmm-sys-util",
 ]
@@ -917,8 +888,9 @@ name = "vm-device"
 version = "0.1.0"
 dependencies = [
 "anyhow",
- "hypervisor",
 "serde",
+ "serde_derive",
+ "serde_json",
 "thiserror",
 "vfio-ioctls",
 "vm-memory",
@@ -932,9 +904,9 @@ source = "git+https://github.com/rust-vmm/vm-fdt?branch=main#720e48e435b791ec6cb

 [[package]]
 name = "vm-memory"
-version = "0.8.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "767ed8aaebbff902e02e6d3749dc2baef55e46565f8a6414a065e5baee4b4a81"
+checksum = "339d4349c126fdcd87e034631d7274370cf19eb0e87b33166bcd956589fc72c5"
 dependencies = [
 "arc-swap",
 "libc",
@@ -947,6 +919,7 @@ version = "0.1.0"
 dependencies = [
 "anyhow",
 "serde",
+ "serde_derive",
 "serde_json",
 "thiserror",
 "versionize",
@@ -959,6 +932,7 @@ name = "vm-virtio"
 version = "0.1.0"
 dependencies = [
 "log",
+ "virtio-bindings",
 "virtio-queue",
 "vm-memory",
 ]
@@ -977,18 +951,21 @@ dependencies = [
 "devices",
 "epoll",
 "event_monitor",
+ "gdbstub",
+ "gdbstub_arch",
 "hypervisor",
+ "lazy_static",
 "libc",
 "linux-loader",
 "log",
 "micro_http",
 "net_util",
- "once_cell",
 "option_parser",
 "pci",
 "qcow",
 "seccompiler",
 "serde",
+ "serde_derive",
 "serde_json",
 "signal-hook",
 "thiserror",
@@ -1010,9 +987,9 @@ dependencies = [

 [[package]]
 name = "vmm-sys-util"
-version = "0.10.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08604d7be03eb26e33b3cee3ed4aef2bf550b305d1cca60e84da5d28d3790b62"
+checksum = "733537bded03aaa93543f785ae997727b30d1d9f4a03b7861d23290474242e11"
 dependencies = [
 "bitflags",
 "libc",
@@ -1022,9 +999,9 @@ dependencies = [

 [[package]]
 name = "wasi"
-version = "0.11.0+wasi-snapshot-preview1"
+version = "0.10.2+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"

 [[package]]
 name = "winapi"
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -10,22 +10,16 @@ cargo-fuzz = true

 [dependencies]
 block_util = { path = "../block_util" }
-devices = { path = "../devices" }
-epoll = "4.3.1"
-libc = "0.2.131"
+libc = "0.2.123"
 libfuzzer-sys = "0.4.3"
-micro_http = { git = "https://github.com/firecracker-microvm/micro-http", branch = "main" }
-once_cell = "1.13.1"
 qcow = { path = "../qcow" }
 seccompiler = "0.2.0"
 vhdx = { path = "../vhdx" }
 virtio-devices = { path = "../virtio-devices" }
-virtio-queue = "0.5.0"
-vmm = { path = "../vmm" }
-vmm-sys-util = "0.10.0"
-vm-memory = "0.8.0"
-vm-device = { path = "../vm-device" }
+virtio-queue = "0.2.0"
+vmm-sys-util = "0.9.0"
 vm-virtio = { path = "../vm-virtio" }
+vm-memory = "0.7.0"

 [dependencies.cloud-hypervisor]
 path = ".."
@@ -39,24 +33,6 @@ versionize_derive = { git = "https://github.com/cloud-hypervisor/versionize_deri
 [workspace]
 members = ["."]

-[[bin]]
-name = "block"
-path = "fuzz_targets/block.rs"
-test = false
-doc = false
-
-[[bin]]
-name = "cmos"
-path = "fuzz_targets/cmos.rs"
-test = false
-doc = false
-
-[[bin]]
-name = "http_api"
-path = "fuzz_targets/http_api.rs"
-test = false
-doc = false
-
 [[bin]]
 name = "qcow"
 path = "fuzz_targets/qcow.rs"
@@ -64,8 +40,8 @@ test = false
 doc = false

 [[bin]]
-name = "serial"
-path = "fuzz_targets/serial.rs"
+name = "block"
+path = "fuzz_targets/block.rs"
 test = false
 doc = false

--- a/fuzz/fuzz_targets/block.rs
+++ b/fuzz/fuzz_targets/block.rs
@@ -9,39 +9,84 @@ use libfuzzer_sys::fuzz_target;
 use seccompiler::SeccompAction;
 use std::ffi;
 use std::fs::File;
-use std::io;
+use std::io::{self, Cursor, Read, Seek, SeekFrom};
+use std::mem::size_of;
 use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
 use std::path::PathBuf;
 use std::sync::Arc;
 use virtio_devices::{Block, VirtioDevice, VirtioInterrupt, VirtioInterruptType};
-use virtio_queue::{Queue, QueueT};
+use virtio_queue::{Queue, QueueState};
 use vm_memory::{bitmap::AtomicBitmap, Bytes, GuestAddress, GuestMemoryAtomic};
-use vmm::{EpollContext, EpollDispatch};
 use vmm_sys_util::eventfd::{EventFd, EFD_NONBLOCK};

 type GuestMemoryMmap = vm_memory::GuestMemoryMmap<AtomicBitmap>;

 const MEM_SIZE: u64 = 256 * 1024 * 1024;
+const DESC_SIZE: u64 = 16; // Bytes in one virtio descriptor.
 const QUEUE_SIZE: u16 = 16; // Max entries in the queue.
+const CMD_SIZE: usize = 16; // Bytes in the command.

 fuzz_target!(|bytes| {
-    if bytes.len() as u64 > MEM_SIZE {
+    let size_u64 = size_of::<u64>();
+    let mem = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), MEM_SIZE as usize)]).unwrap();
+
+    // The fuzz data is interpreted as:
+    // starting index 8 bytes
+    // command location 8 bytes
+    // command 16 bytes
+    // descriptors circular buffer 16 bytes * 3
+    if bytes.len() < 4 * size_u64 {
+        // Need an index to start.
        return;
    }

-    let mem = GuestMemoryMmap::from_ranges(&[(GuestAddress(0), MEM_SIZE as usize)]).unwrap();
-    if mem.write_slice(bytes, GuestAddress(0 as u64)).is_err() {
+    let mut data_image = Cursor::new(bytes);
+
+    let first_index = read_u64(&mut data_image);
+    if first_index > MEM_SIZE / DESC_SIZE {
+        return;
+    }
+    let first_offset = first_index * DESC_SIZE;
+    if first_offset as usize + size_u64 > bytes.len() {
+        return;
+    }
+
+    let command_addr = read_u64(&mut data_image);
+    if command_addr > MEM_SIZE - CMD_SIZE as u64 {
+        return;
+    }
+    if mem
+        .write_slice(
+            &bytes[2 * size_u64..(2 * size_u64) + CMD_SIZE],
+            GuestAddress(command_addr as u64),
+        )
+        .is_err()
+    {
+        return;
+    }
+
+    data_image.seek(SeekFrom::Start(first_offset)).unwrap();
+    let desc_table = read_u64(&mut data_image);
+
+    if mem
+        .write_slice(&bytes[32..], GuestAddress(desc_table as u64))
+        .is_err()
+    {
        return;
    }

    let guest_memory = GuestMemoryAtomic::new(mem);

-    let mut q = Queue::new(QUEUE_SIZE).unwrap();
-    q.set_ready(true);
-    q.set_size(QUEUE_SIZE / 2);
+    let mut q = Queue::<
+        GuestMemoryAtomic<GuestMemoryMmap>,
+        QueueState,
+    >::new(guest_memory.clone(), QUEUE_SIZE);
+    q.state.ready = true;
+    q.state.size = QUEUE_SIZE / 2;

-    let evt = EventFd::new(0).unwrap();
-    let queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(evt.as_raw_fd())) };
+    let queue_evts: Vec<EventFd> = vec![EventFd::new(0).unwrap()];
+    let queue_fd = queue_evts[0].as_raw_fd();
+    let queue_evt = unsafe { EventFd::from_raw_fd(libc::dup(queue_fd)) };

    let shm = memfd_create(&ffi::CString::new("fuzz").unwrap(), 0).unwrap();
    let disk_file: File = unsafe { File::from_raw_fd(shm) };
@@ -65,17 +110,20 @@ fuzz_target!(|bytes| {
        .activate(
            guest_memory,
            Arc::new(NoopVirtioInterrupt {}),
-            vec![(0, q, evt)],
+            vec![q],
+            queue_evts,
        )
        .ok();

    queue_evt.write(77).unwrap(); // Rings the doorbell, any byte will do.
-
-    wait_queue_event_processed(queue_evt);
-
-    block.reset(); // Ensure the virtio-block device thread is killed and joined
 });

+fn read_u64<T: Read>(readable: &mut T) -> u64 {
+    let mut buf = [0u8; size_of::<u64>()];
+    readable.read_exact(&mut buf[..]).unwrap();
+    u64::from_le_bytes(buf)
+}
+
 fn memfd_create(name: &ffi::CStr, flags: u32) -> Result<RawFd, io::Error> {
    let res = unsafe { libc::syscall(libc::SYS_memfd_create, name.as_ptr(), flags) };

@@ -89,33 +137,10 @@ fn memfd_create(name: &ffi::CStr, flags: u32) -> Result<RawFd, io::Error> {
 pub struct NoopVirtioInterrupt {}

 impl VirtioInterrupt for NoopVirtioInterrupt {
-    fn trigger(&self, _int_type: VirtioInterruptType) -> std::result::Result<(), std::io::Error> {
+    fn trigger(
+        &self,
+        _int_type: VirtioInterruptType,
+    ) -> std::result::Result<(), std::io::Error> {
        Ok(())
    }
 }
-
-fn wait_queue_event_processed(queue_evt: EventFd) {
-    let mut epoll = EpollContext::new().unwrap();
-    epoll.add_event(&queue_evt, EpollDispatch::Api).unwrap();
-
-    let epoll_fd = epoll.as_raw_fd();
-    let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); 1];
-
-    loop {
-        let num_events = match epoll::wait(epoll_fd, 0, &mut events[..]) {
-            Ok(res) => res,
-            Err(e) => {
-                if e.kind() == io::ErrorKind::Interrupted {
-                    continue;
-                }
-
-                println!("Warning: Unexpected epoll::wait() error!");
-                break;
-            }
-        };
-
-        if num_events == 0 {
-            break;
-        }
-    }
-}
--- a/fuzz/fuzz_targets/cmos.rs
+++ b/fuzz/fuzz_targets/cmos.rs
@@ -1,48 +0,0 @@
-// Copyright © 2022 Intel Corporation
-//
-// SPDX-License-Identifier: Apache-2.0
-
-#![no_main]
-use devices::legacy::Cmos;
-use libc::EFD_NONBLOCK;
-use libfuzzer_sys::fuzz_target;
-use vm_device::BusDevice;
-use vmm_sys_util::eventfd::EventFd;
-
-fuzz_target!(|bytes| {
-    // Need at least 16 bytes for the test
-    if bytes.len() < 16 {
-        return;
-    }
-
-    let mut below_4g = [0u8; 8];
-    let mut above_4g = [0u8; 8];
-
-    below_4g.copy_from_slice(&bytes[0..8]);
-    above_4g.copy_from_slice(&bytes[8..16]);
-
-    let mut cmos = Cmos::new(
-        u64::from_le_bytes(below_4g),
-        u64::from_le_bytes(above_4g),
-        EventFd::new(EFD_NONBLOCK).unwrap(),
-    );
-
-    let mut i = 16;
-    while i < bytes.len() {
-        let read = bytes.get(i).unwrap_or(&0) % 2 == 0;
-        i += 1;
-
-        if read {
-            let offset = (bytes.get(i).unwrap_or(&0) % 2) as u64;
-            i += 1;
-            let mut out_bytes = vec![0];
-            cmos.read(0, offset, &mut out_bytes);
-        } else {
-            let offset = (bytes.get(i).unwrap_or(&0) % 2) as u64;
-            i += 1;
-            let data = vec![*bytes.get(i).unwrap_or(&0)];
-            i += 1;
-            cmos.write(0, offset, &data);
-        }
-    }
-});
--- a/fuzz/fuzz_targets/http_api.rs
+++ b/fuzz/fuzz_targets/http_api.rs
@@ -1,191 +0,0 @@
-// Copyright © 2022 Intel Corporation
-//
-// SPDX-License-Identifier: Apache-2.0
-
-#![no_main]
-use libfuzzer_sys::fuzz_target;
-use micro_http::Request;
-use once_cell::sync::Lazy;
-use std::os::unix::io::AsRawFd;
-use std::sync::mpsc::{channel, Receiver};
-use std::thread;
-use vmm::api::{http::*, ApiRequest, ApiResponsePayload};
-use vmm::{EpollContext, EpollDispatch};
-use vmm_sys_util::eventfd::EventFd;
-
-// Need to be ordered for test case reproducibility
-static ROUTES: Lazy<Vec<&Box<dyn EndpointHandler + Sync + Send>>> =
-    Lazy::new(|| HTTP_ROUTES.routes.values().collect());
-
-fuzz_target!(|bytes| {
-    if bytes.len() < 2 {
-        return;
-    }
-
-    let route = ROUTES[bytes[0] as usize % ROUTES.len()];
-    if let Some(request) = generate_request(&bytes[1..]) {
-        let exit_evt = EventFd::new(libc::EFD_NONBLOCK).unwrap();
-        let api_evt = EventFd::new(libc::EFD_NONBLOCK).unwrap();
-        let (api_sender, api_receiver) = channel();
-
-        let http_receiver_thread = {
-            let exit_evt = exit_evt.try_clone().unwrap();
-            let api_evt = api_evt.try_clone().unwrap();
-            thread::Builder::new()
-                .name("http_receiver".to_string())
-                .spawn(move || {
-                    http_receiver_stub(exit_evt, api_evt, api_receiver);
-                })
-                .unwrap()
-        };
-
-        route.handle_request(&request, api_evt, api_sender);
-        exit_evt.write(1).ok();
-        http_receiver_thread.join().unwrap();
-    };
-});
-
-fn generate_request(bytes: &[u8]) -> Option<Request> {
-    let req_method = match bytes[0] % 5 {
-        0 => "GET",
-        1 => "PUT",
-        2 => "PATCH",
-        3 => "POST",
-        _ => "INVALID",
-    };
-    let request_line = format!("{} http://localhost/home HTTP/1.1\r\n", req_method);
-
-    let req_body = &bytes[1..];
-    let request = if req_body.len() > 0 {
-        [
-            format!("{}Content-Length: {}\r\n", request_line, req_body.len()).as_bytes(),
-            req_body,
-        ]
-        .concat()
-    } else {
-        format!("{}\r\n", request_line).as_bytes().to_vec()
-    };
-
-    Request::try_from(&request, None).ok()
-}
-
-fn http_receiver_stub(exit_evt: EventFd, api_evt: EventFd, api_receiver: Receiver<ApiRequest>) {
-    let mut epoll = EpollContext::new().unwrap();
-    epoll.add_event(&exit_evt, EpollDispatch::Exit).unwrap();
-    epoll.add_event(&api_evt, EpollDispatch::Api).unwrap();
-
-    let epoll_fd = epoll.as_raw_fd();
-    let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); 2];
-    let num_events;
-    loop {
-        num_events = match epoll::wait(epoll_fd, -1, &mut events[..]) {
-            Ok(num_events) => num_events,
-            Err(e) => match e.raw_os_error() {
-                Some(libc::EAGAIN) | Some(libc::EINTR) => continue,
-                _ => panic!("Unexpected epoll::wait error!"),
-            },
-        };
-
-        break;
-    }
-
-    for event in events.iter().take(num_events) {
-        let dispatch_event: EpollDispatch = event.data.into();
-        match dispatch_event {
-            EpollDispatch::Exit => {
-                break;
-            }
-            EpollDispatch::Api => {
-                for _ in 0..api_evt.read().unwrap() {
-                    let api_request = api_receiver.recv().unwrap();
-                    match api_request {
-                        ApiRequest::VmCreate(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmDelete(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmBoot(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmShutdown(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmReboot(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmInfo(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmmPing(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmPause(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmResume(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmSnapshot(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmRestore(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmmShutdown(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmResize(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmResizeZone(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddDevice(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddUserDevice(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmRemoveDevice(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddDisk(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddFs(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddPmem(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddNet(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddVdpa(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmAddVsock(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmCounters(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmReceiveMigration(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmSendMigration(_, sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                        ApiRequest::VmPowerButton(sender) => {
-                            sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
-                        }
-                    }
-                }
-            }
-            _ => {
-                panic!("Unexpected Epoll event");
-            }
-        }
-    }
-}
--- a/fuzz/fuzz_targets/serial.rs
+++ b/fuzz/fuzz_targets/serial.rs
@@ -1,73 +0,0 @@
-// Copyright © 2022 Intel Corporation
-//
-// SPDX-License-Identifier: Apache-2.0
-
-#![no_main]
-use devices::legacy::Serial;
-use libc::EFD_NONBLOCK;
-use libfuzzer_sys::fuzz_target;
-use std::sync::Arc;
-use vm_device::interrupt::{InterruptIndex, InterruptSourceConfig, InterruptSourceGroup};
-use vm_device::BusDevice;
-use vmm_sys_util::eventfd::EventFd;
-
-fuzz_target!(|bytes| {
-    let mut serial = Serial::new_sink(
-        "serial".into(),
-        Arc::new(TestInterrupt::new(EventFd::new(EFD_NONBLOCK).unwrap())),
-    );
-
-    let mut i = 0;
-    while i < bytes.len() {
-        let choice = bytes.get(i).unwrap_or(&0) % 3;
-        i += 1;
-
-        match choice {
-            0 => {
-                let offset = (bytes.get(i).unwrap_or(&0) % 8) as u64;
-                i += 1;
-                let mut out_bytes = vec![0];
-                serial.read(0, offset, &mut out_bytes);
-            }
-            1 => {
-                let offset = (bytes.get(i).unwrap_or(&0) % 8) as u64;
-                i += 1;
-                let data = vec![*bytes.get(i).unwrap_or(&0)];
-                i += 1;
-                serial.write(0, offset, &data);
-            }
-            _ => {
-                let data = vec![*bytes.get(i).unwrap_or(&0)];
-                i += 1;
-                serial.queue_input_bytes(&data).ok();
-            }
-        }
-    }
-});
-
-struct TestInterrupt {
-    event_fd: EventFd,
-}
-
-impl InterruptSourceGroup for TestInterrupt {
-    fn trigger(&self, _index: InterruptIndex) -> Result<(), std::io::Error> {
-        self.event_fd.write(1)
-    }
-    fn update(
-        &self,
-        _index: InterruptIndex,
-        _config: InterruptSourceConfig,
-        _masked: bool,
-    ) -> Result<(), std::io::Error> {
-        Ok(())
-    }
-    fn notifier(&self, _index: InterruptIndex) -> Option<EventFd> {
-        Some(self.event_fd.try_clone().unwrap())
-    }
-}
-
-impl TestInterrupt {
-    fn new(event_fd: EventFd) -> Self {
-        TestInterrupt { event_fd }
-    }
-}
--- a/hypervisor/Cargo.toml
+++ b/hypervisor/Cargo.toml
@@ -11,20 +11,20 @@ mshv = ["mshv-ioctls", "mshv-bindings"]
 tdx = []

 [dependencies]
-anyhow = "1.0.62"
-byteorder = "1.4.3"
-thiserror = "1.0.32"
-libc = "0.2.131"
-log = "0.4.17"
+anyhow = "1.0.56"
+epoll = "4.3.1"
+thiserror = "1.0.30"
+libc = "0.2.123"
+log = "0.4.16"
 kvm-ioctls = { version = "0.11.0", optional = true }
 kvm-bindings = { git = "https://github.com/cloud-hypervisor/kvm-bindings", branch = "ch-v0.5.0-tdx", features = ["with-serde", "fam-wrappers"], optional  = true }
-mshv-bindings = { git = "https://github.com/rust-vmm/mshv", branch = "main", features = ["with-serde", "fam-wrappers"], optional  = true }
+mshv-bindings = {git = "https://github.com/rust-vmm/mshv", branch = "main", features = ["with-serde", "fam-wrappers"], optional  = true }
 mshv-ioctls = { git = "https://github.com/rust-vmm/mshv", branch = "main", optional  = true}
-serde = { version = "1.0.143", features = ["rc", "derive"] }
-serde_with = { version = "2.0.0", default-features = false, features = ["macros"] }
-vfio-ioctls = { git = "https://github.com/rust-vmm/vfio", branch = "main", default-features = false }
-vm-memory = { version = "0.8.0", features = ["backend-mmap", "backend-atomic"] }
-vmm-sys-util = { version = "0.10.0", features = ["with-serde"] }
+serde = { version = "1.0.136", features = ["rc"] }
+serde_derive = "1.0.136"
+serde_json = "1.0.79"
+vm-memory = { version = "0.7.0", features = ["backend-mmap", "backend-atomic"] }
+vmm-sys-util = { version = "0.9.0", features = ["with-serde"] }

 [target.'cfg(target_arch = "x86_64")'.dependencies.iced-x86]
 version = "1.17.0"
--- a/hypervisor/src/arch/aarch64/gic.rs
+++ b/hypervisor/src/arch/aarch64/gic.rs
@@ -1,56 +0,0 @@
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
-
-use crate::{CpuState, GicState, HypervisorDeviceError, HypervisorVmError};
-use std::any::Any;
-use std::result;
-
-/// Errors thrown while setting up the VGIC.
-#[derive(Debug)]
-pub enum Error {
-    /// Error while calling KVM ioctl for setting up the global interrupt controller.
-    CreateGic(HypervisorVmError),
-    /// Error while setting device attributes for the GIC.
-    SetDeviceAttribute(HypervisorDeviceError),
-    /// Error while getting device attributes for the GIC.
-    GetDeviceAttribute(HypervisorDeviceError),
-}
-pub type Result<T> = result::Result<T, Error>;
-
-/// Hypervisor agnostic interface for a virtualized GIC
-pub trait Vgic: Send + Sync {
-    /// Returns the fdt compatibility property of the device
-    fn fdt_compatibility(&self) -> &str;
-
-    /// Returns the maint_irq fdt property of the device
-    fn fdt_maint_irq(&self) -> u32;
-
-    /// Returns an array with GIC device properties
-    fn device_properties(&self) -> [u64; 4];
-
-    /// Returns the number of vCPUs this GIC handles
-    fn vcpu_count(&self) -> u64;
-
-    /// Returns whether the GIC device is MSI compatible or not
-    fn msi_compatible(&self) -> bool;
-
-    /// Returns the MSI compatibility property of the device
-    fn msi_compatibility(&self) -> &str;
-
-    /// Returns the MSI reg property of the device
-    fn msi_properties(&self) -> [u64; 2];
-
-    /// Get the values of GICR_TYPER for each vCPU.
-    fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]);
-
-    /// Downcast the trait object to its concrete type.
-    fn as_any_concrete_mut(&mut self) -> &mut dyn Any;
-
-    /// Save the state of GICv3ITS.
-    fn state(&self) -> Result<GicState>;
-
-    /// Restore the state of GICv3ITS.
-    fn set_state(&mut self, state: &GicState) -> Result<()>;
-
-    /// Saves GIC internal data tables into RAM.
-    fn save_data_tables(&self) -> Result<()>;
-}
--- a/hypervisor/src/arch/aarch64/mod.rs
+++ b/hypervisor/src/arch/aarch64/mod.rs
@@ -1,3 +0,0 @@
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
-
-pub mod gic;
--- a/hypervisor/src/arch/emulator/mod.rs
+++ b/hypervisor/src/arch/emulator/mod.rs
@@ -99,7 +99,7 @@ pub enum EmulationError<T: Debug> {
 /// A CpuState is an architecture specific type, representing a CPU state.
 /// The emulator and its instruction handlers modify a given CPU state and
 /// eventually ask the platform to commit it back through `set_cpu_state`.
-pub trait PlatformEmulator {
+pub trait PlatformEmulator: Send + Sync {
    type CpuState: Clone;

    /// Read guest memory into a u8 slice.
--- a/hypervisor/src/arch/mod.rs
+++ b/hypervisor/src/arch/mod.rs
@@ -10,14 +10,9 @@
 //
 // Copyright © 2020, Microsoft Corporation
 //
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
-//

 pub mod emulator;

 #[cfg(target_arch = "x86_64")]
 #[macro_use]
 pub mod x86;
-
-#[cfg(target_arch = "aarch64")]
-pub mod aarch64;
--- a/hypervisor/src/arch/x86/emulator/instructions/mod.rs
+++ b/hypervisor/src/arch/x86/emulator/instructions/mod.rs
@@ -28,11 +28,14 @@ fn get_op<T: CpuStateManager>(
        )));
    }

-    if !matches!(op_size, 1 | 2 | 4 | 8) {
-        return Err(PlatformError::InvalidOperand(anyhow!(
-            "Invalid operand size {:?}",
-            op_size
-        )));
+    match op_size {
+        1 | 2 | 4 | 8 => {}
+        _ => {
+            return Err(PlatformError::InvalidOperand(anyhow!(
+                "Invalid operand size {:?}",
+                op_size
+            )))
+        }
    }

    let value = match insn
@@ -78,11 +81,14 @@ fn set_op<T: CpuStateManager>(
        )));
    }

-    if !matches!(op_size, 1 | 2 | 4 | 8) {
-        return Err(PlatformError::InvalidOperand(anyhow!(
-            "Invalid operand size {:?}",
-            op_size
-        )));
+    match op_size {
+        1 | 2 | 4 | 8 => {}
+        _ => {
+            return Err(PlatformError::InvalidOperand(anyhow!(
+                "Invalid operand size {:?}",
+                op_size
+            )))
+        }
    }

    match insn
--- a/hypervisor/src/arch/x86/emulator/mod.rs
+++ b/hypervisor/src/arch/x86/emulator/mod.rs
@@ -6,11 +6,10 @@

 use crate::arch::emulator::{EmulationError, EmulationResult, PlatformEmulator, PlatformError};
 use crate::arch::x86::emulator::instructions::*;
-use crate::arch::x86::regs::{CR0_PE, EFER_LMA};
-use crate::arch::x86::{
-    segment_type_expand_down, segment_type_ro, Exception, SegmentRegister, SpecialRegisters,
-    StandardRegisters,
-};
+use crate::arch::x86::regs::*;
+use crate::arch::x86::*;
+use crate::arch::x86::{Exception, SegmentRegisterOps};
+use crate::x86_64::{SegmentRegister, SpecialRegisters, StandardRegisters};
 use anyhow::Context;
 use iced_x86::*;

@@ -18,7 +17,7 @@ use iced_x86::*;
 mod instructions;

 /// x86 CPU modes
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq)]
 pub enum CpuMode {
    /// Real mode
    Real,
--- a/hypervisor/src/arch/x86/gdt.rs
+++ b/hypervisor/src/arch/x86/gdt.rs
@@ -8,7 +8,7 @@
 // found in the LICENSE-BSD-3-Clause file.

 // For GDT details see arch/x86/include/asm/segment.h
-use crate::arch::x86::SegmentRegister;
+use crate::x86_64::SegmentRegister;

 /// Constructor for a conventional segment GDT (or LDT) entry. Derived from the kernel's segment.h.
 pub fn gdt_entry(flags: u16, base: u32, limit: u32) -> u64 {
@@ -51,7 +51,7 @@ fn get_limit(entry: u64) -> u32 {
    // Perform manual limit scaling if G flag is set
    match get_g(entry) {
        0 => limit,
-        _ => (limit << 12) | 0xFFF, // G flag is either 0 or 1
+        _ => ((limit << 12) | 0xFFF), // G flag is either 0 or 1
    }
 }

@@ -106,6 +106,7 @@ pub fn segment_from_gdt(entry: u64, table_index: u8) -> SegmentRegister {
        l: get_l(entry),
        g: get_g(entry),
        avl: get_avl(entry),
+        padding: 0,
        unusable: match get_p(entry) {
            0 => 1,
            _ => 0,
--- a/hypervisor/src/arch/x86/mod.rs
+++ b/hypervisor/src/arch/x86/mod.rs
@@ -13,6 +13,7 @@

 pub mod emulator;
 pub mod gdt;
+#[allow(non_upper_case_globals)]
 #[allow(non_camel_case_types)]
 #[allow(non_snake_case)]
 #[allow(non_upper_case_globals)]
@@ -26,7 +27,7 @@ pub const MTRR_MEM_TYPE_WB: u64 = 0x6;
 pub const NUM_IOAPIC_PINS: usize = 24;

 // X86 Exceptions
-#[allow(clippy::upper_case_acronyms)]
+#[allow(dead_code, clippy::upper_case_acronyms)]
 #[derive(Clone, Debug)]
 pub enum Exception {
    DE = 0,  // Divide Error
@@ -52,86 +53,40 @@ pub enum Exception {

 pub mod regs;

-#[derive(Debug, Default, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "with-serde", derive(Deserialize, Serialize))]
-pub struct SegmentRegister {
-    pub base: u64,
-    pub limit: u32,
-    pub selector: u16,
-    pub type_: u8,
-    pub present: u8,
-    pub dpl: u8,
-    pub db: u8,
-    pub s: u8,
-    pub l: u8,
-    pub g: u8,
-    pub avl: u8,
-    pub unusable: u8,
-}
+// Abstracted segment register ops.
+// Each x86 hypervisor should implement those.
+pub trait SegmentRegisterOps {
+    // Segment type
+    fn segment_type(&self) -> u8;
+    fn set_segment_type(&mut self, val: u8);

-impl SegmentRegister {
-    pub fn segment_type(&self) -> u8 {
-        self.type_
-    }
-    pub fn set_segment_type(&mut self, val: u8) {
-        self.type_ = val;
-    }
+    // Descriptor Privilege Level (DPL)
+    fn dpl(&self) -> u8;
+    fn set_dpl(&mut self, val: u8);

-    pub fn dpl(&self) -> u8 {
-        self.dpl
-    }
+    // Granularity
+    fn granularity(&self) -> u8;
+    fn set_granularity(&mut self, val: u8);

-    pub fn set_dpl(&mut self, val: u8) {
-        self.dpl = val;
-    }
+    // Memory Presence
+    fn present(&self) -> u8;
+    fn set_present(&mut self, val: u8);

-    pub fn present(&self) -> u8 {
-        self.present
-    }
+    // Long mode
+    fn long(&self) -> u8;
+    fn set_long(&mut self, val: u8);

-    pub fn set_present(&mut self, val: u8) {
-        self.present = val;
-    }
+    // Available for system use (AVL)
+    fn avl(&self) -> u8;
+    fn set_avl(&mut self, val: u8);

-    pub fn long(&self) -> u8 {
-        self.l
-    }
+    // Descriptor type (System or code/data)
+    fn desc_type(&self) -> u8;
+    fn set_desc_type(&mut self, val: u8);

-    pub fn set_long(&mut self, val: u8) {
-        self.l = val;
-    }
-
-    pub fn avl(&self) -> u8 {
-        self.avl
-    }
-
-    pub fn set_avl(&mut self, val: u8) {
-        self.avl = val;
-    }
-
-    pub fn desc_type(&self) -> u8 {
-        self.s
-    }
-
-    pub fn set_desc_type(&mut self, val: u8) {
-        self.s = val;
-    }
-
-    pub fn granularity(&self) -> u8 {
-        self.g
-    }
-
-    pub fn set_granularity(&mut self, val: u8) {
-        self.g = val;
-    }
-
-    pub fn db(&self) -> u8 {
-        self.db
-    }
-
-    pub fn set_db(&mut self, val: u8) {
-        self.db = val;
-    }
+    // D/B
+    fn db(&self) -> u8;
+    fn set_db(&mut self, val: u8);
 }

 // Code segment
@@ -160,6 +115,7 @@ macro_rules! msr {
        MsrEntry {
            index: $msr,
            data: 0x0,
+            ..Default::default()
        }
    };
 }
@@ -169,143 +125,7 @@ macro_rules! msr_data {
        MsrEntry {
            index: $msr,
            data: $data,
+            ..Default::default()
        }
    };
 }
-
-#[derive(Debug, Default, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "with-serde", derive(Deserialize, Serialize))]
-pub struct StandardRegisters {
-    pub rax: u64,
-    pub rbx: u64,
-    pub rcx: u64,
-    pub rdx: u64,
-    pub rsi: u64,
-    pub rdi: u64,
-    pub rsp: u64,
-    pub rbp: u64,
-    pub r8: u64,
-    pub r9: u64,
-    pub r10: u64,
-    pub r11: u64,
-    pub r12: u64,
-    pub r13: u64,
-    pub r14: u64,
-    pub r15: u64,
-    pub rip: u64,
-    pub rflags: u64,
-}
-
-#[derive(Debug, Default, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "with-serde", derive(Deserialize, Serialize))]
-pub struct DescriptorTable {
-    pub base: u64,
-    pub limit: u16,
-}
-
-#[derive(Debug, Default, Copy, Clone, PartialEq, Eq)]
-#[cfg_attr(feature = "with-serde", derive(Deserialize, Serialize))]
-pub struct SpecialRegisters {
-    pub cs: SegmentRegister,
-    pub ds: SegmentRegister,
-    pub es: SegmentRegister,
-    pub fs: SegmentRegister,
-    pub gs: SegmentRegister,
-    pub ss: SegmentRegister,
-    pub tr: SegmentRegister,
-    pub ldt: SegmentRegister,
-    pub gdt: DescriptorTable,
-    pub idt: DescriptorTable,
-    pub cr0: u64,
-    pub cr2: u64,
-    pub cr3: u64,
-    pub cr4: u64,
-    pub cr8: u64,
-    pub efer: u64,
-    pub apic_base: u64,
-    pub interrupt_bitmap: [u64; 4usize],
-}
-
-#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, serde::Deserialize, serde::Serialize)]
-pub struct CpuIdEntry {
-    pub function: u32,
-    pub index: u32,
-    pub flags: u32,
-    pub eax: u32,
-    pub ebx: u32,
-    pub ecx: u32,
-    pub edx: u32,
-}
-
-pub const CPUID_FLAG_VALID_INDEX: u32 = 1;
-
-#[derive(Default, Debug, Clone, serde::Deserialize, serde::Serialize)]
-pub struct FpuState {
-    pub fpr: [[u8; 16usize]; 8usize],
-    pub fcw: u16,
-    pub fsw: u16,
-    pub ftwx: u8,
-    pub last_opcode: u16,
-    pub last_ip: u64,
-    pub last_dp: u64,
-    pub xmm: [[u8; 16usize]; 16usize],
-    pub mxcsr: u32,
-}
-
-#[serde_with::serde_as]
-#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
-pub struct LapicState {
-    #[serde_as(as = "[_; 1024usize]")]
-    pub(crate) regs: [::std::os::raw::c_char; 1024usize],
-}
-
-impl Default for LapicState {
-    fn default() -> Self {
-        // SAFETY: this is plain old data structure
-        unsafe { ::std::mem::zeroed() }
-    }
-}
-
-impl LapicState {
-    pub fn get_klapic_reg(&self, reg_offset: usize) -> u32 {
-        use byteorder::{LittleEndian, ReadBytesExt};
-        use std::io::Cursor;
-        use std::mem;
-
-        let sliceu8 = unsafe {
-            // This array is only accessed as parts of a u32 word, so interpret it as a u8 array.
-            // Cursors are only readable on arrays of u8, not i8(c_char).
-            mem::transmute::<&[i8], &[u8]>(&self.regs[reg_offset..])
-        };
-
-        let mut reader = Cursor::new(sliceu8);
-        // Following call can't fail if the offsets defined above are correct.
-        reader
-            .read_u32::<LittleEndian>()
-            .expect("Failed to read klapic register")
-    }
-
-    pub fn set_klapic_reg(&mut self, reg_offset: usize, value: u32) {
-        use byteorder::{LittleEndian, WriteBytesExt};
-        use std::io::Cursor;
-        use std::mem;
-
-        let sliceu8 = unsafe {
-            // This array is only accessed as parts of a u32 word, so interpret it as a u8 array.
-            // Cursors are only readable on arrays of u8, not i8(c_char).
-            mem::transmute::<&mut [i8], &mut [u8]>(&mut self.regs[reg_offset..])
-        };
-
-        let mut writer = Cursor::new(sliceu8);
-        // Following call can't fail if the offsets defined above are correct.
-        writer
-            .write_u32::<LittleEndian>(value)
-            .expect("Failed to write klapic register")
-    }
-}
-
-#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, serde::Deserialize, serde::Serialize)]
-pub struct MsrEntry {
-    pub index: u32,
-    pub data: u64,
-}
--- a/hypervisor/src/cpu.rs
+++ b/hypervisor/src/cpu.rs
@@ -9,17 +9,28 @@
 //

 #[cfg(target_arch = "aarch64")]
-use crate::aarch64::{RegList, StandardRegisters, VcpuInit};
+use crate::aarch64::VcpuInit;
+#[cfg(target_arch = "aarch64")]
+use crate::aarch64::{RegList, Register, StandardRegisters};
 #[cfg(target_arch = "x86_64")]
-use crate::arch::x86::{
-    CpuIdEntry, FpuState, LapicState, MsrEntry, SpecialRegisters, StandardRegisters,
+use crate::x86_64::{CpuId, LapicState};
+#[cfg(target_arch = "x86_64")]
+use crate::x86_64::{
+    ExtendedControlRegisters, FpuState, MsrEntries, SpecialRegisters, StandardRegisters, VcpuEvents,
 };
-#[cfg(feature = "tdx")]
-use crate::kvm::{TdxExitDetails, TdxExitStatus};
 use crate::CpuState;
+#[cfg(target_arch = "aarch64")]
+use crate::DeviceAttr;
+#[cfg(feature = "kvm")]
 use crate::MpState;
-use thiserror::Error;
+#[cfg(all(feature = "mshv", target_arch = "x86_64"))]
+use crate::SuspendRegisters;
 #[cfg(target_arch = "x86_64")]
+use crate::Xsave;
+#[cfg(feature = "tdx")]
+use crate::{TdxExitDetails, TdxExitStatus};
+use thiserror::Error;
+#[cfg(all(feature = "kvm", target_arch = "x86_64"))]
 use vm_memory::GuestAddress;

 #[derive(Error, Debug)]
@@ -37,6 +48,11 @@ pub enum HypervisorCpuError {
    #[error("Failed to get standard registers: {0}")]
    GetStandardRegs(#[source] anyhow::Error),
    ///
+    /// Getting suspend registers error
+    ///
+    #[error("Failed to get suspend registers: {0}")]
+    GetSuspendRegs(#[source] anyhow::Error),
+    ///
    /// Setting special register error
    ///
    #[error("Failed to set special registers: {0}")]
@@ -232,12 +248,6 @@ pub enum HypervisorCpuError {
    #[cfg(feature = "tdx")]
    #[error("Unknown TDX VM call")]
    UnknownTdxVmCall,
-    #[cfg(target_arch = "aarch64")]
-    ///
-    /// Failed to intialize PMU
-    ///
-    #[error("Failed to initialize PMU")]
-    InitializePmu,
 }

 #[derive(Debug)]
@@ -268,10 +278,22 @@ pub type Result<T> = anyhow::Result<T, HypervisorCpuError>;
 /// Trait to represent a generic Vcpu
 ///
 pub trait Vcpu: Send + Sync {
+    #[cfg(target_arch = "x86_64")]
    ///
    /// Returns the vCPU general purpose registers.
    ///
    fn get_regs(&self) -> Result<StandardRegisters>;
+    #[cfg(target_arch = "aarch64")]
+    ///
+    /// Sets vcpu attribute
+    ///
+    fn set_vcpu_attr(&self, attr: &DeviceAttr) -> Result<()>;
+    #[cfg(target_arch = "aarch64")]
+    ///
+    /// Check if vcpu has attribute.
+    ///
+    fn has_vcpu_attr(&self, attr: &DeviceAttr) -> Result<()>;
+    #[cfg(target_arch = "x86_64")]
    ///
    /// Sets the vCPU general purpose registers.
    ///
@@ -300,7 +322,7 @@ pub trait Vcpu: Send + Sync {
    ///
    /// X86 specific call to setup the CPUID registers.
    ///
-    fn set_cpuid2(&self, cpuid: &[CpuIdEntry]) -> Result<()>;
+    fn set_cpuid2(&self, cpuid: &CpuId) -> Result<()>;
    #[cfg(target_arch = "x86_64")]
    ///
    /// X86 specific call to enable HyperV SynIC
@@ -310,7 +332,7 @@ pub trait Vcpu: Send + Sync {
    ///
    /// X86 specific call to retrieve the CPUID registers.
    ///
-    fn get_cpuid2(&self, num_entries: usize) -> Result<Vec<CpuIdEntry>>;
+    fn get_cpuid2(&self, num_entries: usize) -> Result<CpuId>;
    #[cfg(target_arch = "x86_64")]
    ///
    /// Returns the state of the LAPIC (Local Advanced Programmable Interrupt Controller).
@@ -325,66 +347,111 @@ pub trait Vcpu: Send + Sync {
    ///
    /// Returns the model-specific registers (MSR) for this vCPU.
    ///
-    fn get_msrs(&self, msrs: &mut Vec<MsrEntry>) -> Result<usize>;
+    fn get_msrs(&self, msrs: &mut MsrEntries) -> Result<usize>;
    #[cfg(target_arch = "x86_64")]
    ///
    /// Setup the model-specific registers (MSR) for this vCPU.
    ///
-    fn set_msrs(&self, msrs: &[MsrEntry]) -> Result<usize>;
+    fn set_msrs(&self, msrs: &MsrEntries) -> Result<usize>;
+    #[cfg(feature = "kvm")]
    ///
    /// Returns the vcpu's current "multiprocessing state".
    ///
    fn get_mp_state(&self) -> Result<MpState>;
+    #[cfg(feature = "kvm")]
    ///
    /// Sets the vcpu's current "multiprocessing state".
    ///
    fn set_mp_state(&self, mp_state: MpState) -> Result<()>;
    #[cfg(target_arch = "x86_64")]
    ///
+    /// X86 specific call that returns the vcpu's current "xsave struct".
+    ///
+    fn get_xsave(&self) -> Result<Xsave>;
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// X86 specific call that sets the vcpu's current "xsave struct".
+    ///
+    fn set_xsave(&self, xsave: &Xsave) -> Result<()>;
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// X86 specific call that returns the vcpu's current "xcrs".
+    ///
+    fn get_xcrs(&self) -> Result<ExtendedControlRegisters>;
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// X86 specific call that sets the vcpu's current "xcrs".
+    ///
+    fn set_xcrs(&self, xcrs: &ExtendedControlRegisters) -> Result<()>;
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// Returns currently pending exceptions, interrupts, and NMIs as well as related
+    /// states of the vcpu.
+    ///
+    fn get_vcpu_events(&self) -> Result<VcpuEvents>;
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// Sets pending exceptions, interrupts, and NMIs as well as related states
+    /// of the vcpu.
+    ///
+    fn set_vcpu_events(&self, events: &VcpuEvents) -> Result<()>;
+    #[cfg(all(feature = "kvm", target_arch = "x86_64"))]
+    ///
    /// Let the guest know that it has been paused, which prevents from
    /// potential soft lockups when being resumed.
    ///
-    fn notify_guest_clock_paused(&self) -> Result<()> {
-        Ok(())
-    }
-    #[cfg(target_arch = "x86_64")]
+    fn notify_guest_clock_paused(&self) -> Result<()>;
+    #[cfg(all(feature = "kvm", target_arch = "x86_64"))]
    ///
    /// Sets debug registers to set hardware breakpoints and/or enable single step.
    ///
-    fn set_guest_debug(&self, _addrs: &[GuestAddress], _singlestep: bool) -> Result<()> {
-        Err(HypervisorCpuError::SetDebugRegs(anyhow!("unimplemented")))
-    }
+    fn set_guest_debug(&self, addrs: &[GuestAddress], singlestep: bool) -> Result<()>;
    ///
    /// Sets the type of CPU to be exposed to the guest and optional features.
    ///
-    #[cfg(target_arch = "aarch64")]
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
    fn vcpu_init(&self, kvi: &VcpuInit) -> Result<()>;
    ///
+    /// Sets the value of one register for this vCPU.
+    ///
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn set_reg(&self, reg_id: u64, data: u64) -> Result<()>;
+    ///
+    /// Sets the value of one register for this vCPU.
+    ///
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn get_reg(&self, reg_id: u64) -> Result<u64>;
+    ///
    /// Gets a list of the guest registers that are supported for the
    /// KVM_GET_ONE_REG/KVM_SET_ONE_REG calls.
    ///
-    #[cfg(target_arch = "aarch64")]
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
    fn get_reg_list(&self, reg_list: &mut RegList) -> Result<()>;
    ///
-    /// Gets the value of a system register
+    /// Save the state of the core registers.
    ///
-    #[cfg(target_arch = "aarch64")]
-    fn get_sys_reg(&self, sys_reg: u32) -> Result<u64>;
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn core_registers(&self, state: &mut StandardRegisters) -> Result<()>;
    ///
-    /// Configure core registers for a given CPU.
+    /// Restore the state of the core registers.
    ///
-    #[cfg(target_arch = "aarch64")]
-    fn setup_regs(&self, cpu_id: u8, boot_ip: u64, fdt_start: u64) -> Result<()>;
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn set_core_registers(&self, state: &StandardRegisters) -> Result<()>;
    ///
-    /// Check if the CPU supports PMU
+    /// Save the state of the system registers.
    ///
-    #[cfg(target_arch = "aarch64")]
-    fn has_pmu_support(&self) -> bool;
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn system_registers(&self, state: &mut Vec<Register>) -> Result<()>;
    ///
-    /// Initialize PMU
+    /// Restore the state of the system registers.
    ///
-    #[cfg(target_arch = "aarch64")]
-    fn init_pmu(&self, irq: u32) -> Result<()>;
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn set_system_registers(&self, state: &[Register]) -> Result<()>;
+    ///
+    /// Read the MPIDR - Multiprocessor Affinity Register.
+    ///
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+    fn read_mpidr(&self) -> Result<u64>;
    ///
    /// Retrieve the vCPU state.
    /// This function is necessary to snapshot the VM
@@ -409,10 +476,16 @@ pub trait Vcpu: Send + Sync {
    ///
    #[cfg(feature = "tdx")]
    fn tdx_init(&self, hob_address: u64) -> Result<()>;
+    #[cfg(all(feature = "mshv", target_arch = "x86_64"))]
+    ///
+    /// Return suspend registers(explicit and intercept suspend registers)
+    ///
+    fn get_suspend_regs(&self) -> Result<SuspendRegisters>;
+    #[cfg(feature = "kvm")]
    ///
    /// Set the "immediate_exit" state
    ///
-    fn set_immediate_exit(&self, _exit: bool) {}
+    fn set_immediate_exit(&self, exit: bool);
    #[cfg(feature = "tdx")]
    ///
    /// Returns the details about TDX exit reason
@@ -423,9 +496,4 @@ pub trait Vcpu: Send + Sync {
    /// Set the status code for TDX exit
    ///
    fn set_tdx_status(&mut self, status: TdxExitStatus);
-    #[cfg(target_arch = "x86_64")]
-    ///
-    /// Return the list of initial MSR entries for a VCPU
-    ///
-    fn boot_msr_entries(&self) -> Vec<MsrEntry>;
 }
--- a/hypervisor/src/device.rs
+++ b/hypervisor/src/device.rs
@@ -9,6 +9,8 @@
 // Copyright 2020, ARM Limited
 //

+use crate::DeviceAttr;
+use std::os::unix::io::AsRawFd;
 use thiserror::Error;

 #[derive(Error, Debug)]
@@ -26,3 +28,20 @@ pub enum HypervisorDeviceError {
    #[error("Failed to get device attribute: {0}")]
    GetDeviceAttribute(#[source] anyhow::Error),
 }
+
+///
+/// Result type for returning from a function
+///
+pub type Result<T> = std::result::Result<T, HypervisorDeviceError>;
+
+///
+/// Trait to represent a device
+///
+/// This crate provides a hypervisor-agnostic interfaces for device
+///
+pub trait Device: Send + Sync + AsRawFd {
+    /// Set device attribute.
+    fn set_device_attr(&self, attr: &DeviceAttr) -> Result<()>;
+    /// Get device attribute.
+    fn get_device_attr(&self, attr: &mut DeviceAttr) -> Result<()>;
+}
--- a/hypervisor/src/hypervisor.rs
+++ b/hypervisor/src/hypervisor.rs
@@ -7,12 +7,13 @@
 // Copyright 2018-2019 CrowdStrike, Inc.
 //
 //
-#[cfg(target_arch = "x86_64")]
-use crate::arch::x86::CpuIdEntry;
-#[cfg(feature = "tdx")]
-use crate::kvm::TdxCapabilities;
 use crate::vm::Vm;
-use crate::HypervisorType;
+#[cfg(target_arch = "x86_64")]
+use crate::x86_64::CpuId;
+#[cfg(target_arch = "x86_64")]
+use crate::x86_64::MsrList;
+#[cfg(feature = "tdx")]
+use crate::TdxCapabilities;
 use std::sync::Arc;
 use thiserror::Error;

@@ -20,11 +21,6 @@ use thiserror::Error;
 ///
 ///
 pub enum HypervisorError {
-    ///
-    /// Hypervisor availability check error
-    ///
-    #[error("Failed to check availability of the hypervisor: {0}")]
-    HypervisorAvailableCheck(#[source] anyhow::Error),
    ///
    /// hypervisor creation error
    ///
@@ -70,11 +66,6 @@ pub enum HypervisorError {
    ///
    #[error("Failed to retrieve TDX capabilities:{0}")]
    TdxCapabilities(#[source] anyhow::Error),
-    ///
-    /// Failed to set partition property
-    ///
-    #[error("Failed to set partition property:{0}")]
-    SetPartitionProperty(#[source] anyhow::Error),
 }

 ///
@@ -88,10 +79,6 @@ pub type Result<T> = std::result::Result<T, HypervisorError>;
 /// This crate provides a hypervisor-agnostic interfaces
 ///
 pub trait Hypervisor: Send + Sync {
-    ///
-    /// Returns the type of the hypervisor
-    ///
-    fn hypervisor_type(&self) -> HypervisorType;
    ///
    /// Create a Vm using the underlying hypervisor
    /// Return a hypervisor-agnostic Vm trait object
@@ -108,13 +95,18 @@ pub trait Hypervisor: Send + Sync {
    ///
    /// Get the supported CpuID
    ///
-    fn get_cpuid(&self) -> Result<Vec<CpuIdEntry>>;
+    fn get_cpuid(&self) -> Result<CpuId>;
    ///
    /// Check particular extensions if any
    ///
    fn check_required_extensions(&self) -> Result<()> {
        Ok(())
    }
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// Retrieve the list of MSRs supported by the hypervisor.
+    ///
+    fn get_msr_list(&self) -> Result<MsrList>;
    #[cfg(target_arch = "aarch64")]
    ///
    /// Retrieve AArch64 host maximum IPA size supported by KVM.
--- a/hypervisor/src/kvm/aarch64/gic/mod.rs
+++ b/hypervisor/src/kvm/aarch64/gic/mod.rs
@@ -1,617 +0,0 @@
-// Copyright 2022 Arm Limited (or its affiliates). All rights reserved.
-
-mod dist_regs;
-mod icc_regs;
-mod redist_regs;
-
-use crate::arch::aarch64::gic::{Error, Result, Vgic};
-use crate::device::HypervisorDeviceError;
-use crate::kvm::{kvm_bindings, KvmVm};
-use crate::{CpuState, Vm};
-use dist_regs::{get_dist_regs, read_ctlr, set_dist_regs, write_ctlr};
-use icc_regs::{get_icc_regs, set_icc_regs};
-use kvm_ioctls::DeviceFd;
-use redist_regs::{construct_gicr_typers, get_redist_regs, set_redist_regs};
-use serde::{Deserialize, Serialize};
-use std::any::Any;
-use std::convert::TryInto;
-
-const GITS_CTLR: u32 = 0x0000;
-const GITS_IIDR: u32 = 0x0004;
-const GITS_CBASER: u32 = 0x0080;
-const GITS_CWRITER: u32 = 0x0088;
-const GITS_CREADR: u32 = 0x0090;
-const GITS_BASER: u32 = 0x0100;
-
-/// Access an ITS device attribute.
-///
-/// This is a helper function to get/set the ITS device attribute depending
-/// the bool parameter `set` provided.
-pub fn gicv3_its_attr_access(
-    its_device: &DeviceFd,
-    group: u32,
-    attr: u32,
-    val: &u64,
-    set: bool,
-) -> Result<()> {
-    let mut gicv3_its_attr = kvm_bindings::kvm_device_attr {
-        group,
-        attr: attr as u64,
-        addr: val as *const u64 as u64,
-        flags: 0,
-    };
-    if set {
-        its_device.set_device_attr(&gicv3_its_attr).map_err(|e| {
-            Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into()))
-        })
-    } else {
-        its_device
-            .get_device_attr(&mut gicv3_its_attr)
-            .map_err(|e| {
-                Error::GetDeviceAttribute(HypervisorDeviceError::GetDeviceAttribute(e.into()))
-            })
-    }
-}
-
-/// Function that saves/restores ITS tables into guest RAM.
-///
-/// The tables get flushed to guest RAM whenever the VM gets stopped.
-pub fn gicv3_its_tables_access(its_device: &DeviceFd, save: bool) -> Result<()> {
-    let attr = if save {
-        u64::from(kvm_bindings::KVM_DEV_ARM_ITS_SAVE_TABLES)
-    } else {
-        u64::from(kvm_bindings::KVM_DEV_ARM_ITS_RESTORE_TABLES)
-    };
-
-    let init_gic_attr = kvm_bindings::kvm_device_attr {
-        group: kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
-        attr,
-        addr: 0,
-        flags: 0,
-    };
-    its_device
-        .set_device_attr(&init_gic_attr)
-        .map_err(|e| Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into())))
-}
-
-pub struct KvmGicV3Its {
-    /// The KVM device for the GicV3
-    device: DeviceFd,
-
-    /// The KVM device for the Its device
-    its_device: Option<DeviceFd>,
-
-    /// Vector holding values of GICR_TYPER for each vCPU
-    gicr_typers: Vec<u64>,
-
-    /// GIC distributor address
-    dist_addr: u64,
-
-    /// GIC distributor size
-    dist_size: u64,
-
-    /// GIC distributors address
-    redists_addr: u64,
-
-    /// GIC distributors size
-    redists_size: u64,
-
-    /// GIC MSI address
-    msi_addr: u64,
-
-    /// GIC MSI size
-    msi_size: u64,
-
-    /// Number of CPUs handled by the device
-    vcpu_count: u64,
-}
-
-#[derive(Clone, Default, Serialize, Deserialize)]
-pub struct Gicv3ItsState {
-    dist: Vec<u32>,
-    rdist: Vec<u32>,
-    icc: Vec<u32>,
-    // special register that enables interrupts and affinity routing
-    gicd_ctlr: u32,
-    its_ctlr: u64,
-    its_iidr: u64,
-    its_cbaser: u64,
-    its_cwriter: u64,
-    its_creadr: u64,
-    its_baser: [u64; 8],
-}
-
-impl KvmGicV3Its {
-    /// Device trees specific constants
-    pub const ARCH_GIC_V3_MAINT_IRQ: u32 = 9;
-
-    /// Returns the GIC version of the device
-    fn version() -> u32 {
-        kvm_bindings::kvm_device_type_KVM_DEV_TYPE_ARM_VGIC_V3
-    }
-
-    /// Setup the device-specific attributes
-    fn init_device_attributes(&mut self, vm: &KvmVm, nr_irqs: u32) -> Result<()> {
-        // GicV3 part attributes
-        /* Setting up the distributor attribute.
-         We are placing the GIC below 1GB so we need to substract the size of the distributor.
-        */
-        Self::set_device_attribute(
-            &self.device,
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ADDR,
-            u64::from(kvm_bindings::KVM_VGIC_V3_ADDR_TYPE_DIST),
-            &self.dist_addr as *const u64 as u64,
-            0,
-        )?;
-
-        /* Setting up the redistributors' attribute.
-        We are calculating here the start of the redistributors address. We have one per CPU.
-        */
-        Self::set_device_attribute(
-            &self.device,
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ADDR,
-            u64::from(kvm_bindings::KVM_VGIC_V3_ADDR_TYPE_REDIST),
-            &self.redists_addr as *const u64 as u64,
-            0,
-        )?;
-
-        // ITS part attributes
-        let mut its_device = kvm_bindings::kvm_create_device {
-            type_: kvm_bindings::kvm_device_type_KVM_DEV_TYPE_ARM_VGIC_ITS,
-            fd: 0,
-            flags: 0,
-        };
-
-        let its_fd = vm
-            .create_device(&mut its_device)
-            .map_err(Error::CreateGic)?;
-
-        // We know vm is KvmVm
-        let its_fd = its_fd.to_kvm().unwrap();
-
-        Self::set_device_attribute(
-            &its_fd,
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ADDR,
-            u64::from(kvm_bindings::KVM_VGIC_ITS_ADDR_TYPE),
-            &self.msi_addr as *const u64 as u64,
-            0,
-        )?;
-
-        Self::set_device_attribute(
-            &its_fd,
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
-            u64::from(kvm_bindings::KVM_DEV_ARM_VGIC_CTRL_INIT),
-            0,
-            0,
-        )?;
-
-        self.its_device = Some(its_fd);
-
-        /* We need to tell the kernel how many irqs to support with this vgic.
-         * See the `layout` module for details.
-         */
-        let nr_irqs_ptr = &nr_irqs as *const u32;
-        Self::set_device_attribute(
-            &self.device,
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
-            0,
-            nr_irqs_ptr as u64,
-            0,
-        )?;
-
-        /* Finalize the GIC.
-         * See https://code.woboq.org/linux/linux/virt/kvm/arm/vgic/vgic-kvm-device.c.html#211.
-         */
-        Self::set_device_attribute(
-            &self.device,
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
-            u64::from(kvm_bindings::KVM_DEV_ARM_VGIC_CTRL_INIT),
-            0,
-            0,
-        )
-    }
-
-    /// Create a KVM Vgic device
-    fn create_device(vm: &KvmVm) -> Result<DeviceFd> {
-        let mut gic_device = kvm_bindings::kvm_create_device {
-            type_: Self::version(),
-            fd: 0,
-            flags: 0,
-        };
-
-        let device_fd = vm
-            .create_device(&mut gic_device)
-            .map_err(Error::CreateGic)?;
-
-        // We know for sure this is a KVM fd
-        Ok(device_fd.to_kvm().unwrap())
-    }
-
-    /// Set a GIC device attribute
-    fn set_device_attribute(
-        device: &DeviceFd,
-        group: u32,
-        attr: u64,
-        addr: u64,
-        flags: u32,
-    ) -> Result<()> {
-        let attr = kvm_bindings::kvm_device_attr {
-            flags,
-            group,
-            attr,
-            addr,
-        };
-        device.set_device_attr(&attr).map_err(|e| {
-            Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into()))
-        })
-    }
-
-    /// Method to initialize the GIC device
-    #[allow(clippy::new_ret_no_self)]
-    pub fn new(
-        vm: &dyn Vm,
-        vcpu_count: u64,
-        dist_addr: u64,
-        dist_size: u64,
-        redist_size: u64,
-        msi_size: u64,
-        nr_irqs: u32,
-    ) -> Result<KvmGicV3Its> {
-        // This is inside KVM module
-        let vm = vm.as_any().downcast_ref::<KvmVm>().expect("Wrong VM type?");
-
-        let vgic = Self::create_device(vm)?;
-        let redists_size: u64 = redist_size * vcpu_count;
-        let redists_addr: u64 = dist_addr - redists_size;
-        let msi_addr: u64 = redists_addr - msi_size;
-
-        let mut gic_device = KvmGicV3Its {
-            device: vgic,
-            its_device: None,
-            gicr_typers: vec![0; vcpu_count.try_into().unwrap()],
-            dist_addr,
-            dist_size,
-            redists_addr,
-            redists_size,
-            msi_addr,
-            msi_size,
-            vcpu_count,
-        };
-
-        gic_device.init_device_attributes(vm, nr_irqs)?;
-
-        Ok(gic_device)
-    }
-}
-
-impl Vgic for KvmGicV3Its {
-    fn fdt_compatibility(&self) -> &str {
-        "arm,gic-v3"
-    }
-
-    fn msi_compatible(&self) -> bool {
-        true
-    }
-
-    fn msi_compatibility(&self) -> &str {
-        "arm,gic-v3-its"
-    }
-
-    fn fdt_maint_irq(&self) -> u32 {
-        KvmGicV3Its::ARCH_GIC_V3_MAINT_IRQ
-    }
-
-    fn vcpu_count(&self) -> u64 {
-        self.vcpu_count
-    }
-
-    fn device_properties(&self) -> [u64; 4] {
-        [
-            self.dist_addr,
-            self.dist_size,
-            self.redists_addr,
-            self.redists_size,
-        ]
-    }
-
-    fn msi_properties(&self) -> [u64; 2] {
-        [self.msi_addr, self.msi_size]
-    }
-
-    fn set_gicr_typers(&mut self, vcpu_states: &[CpuState]) {
-        let gicr_typers = construct_gicr_typers(vcpu_states);
-        self.gicr_typers = gicr_typers;
-    }
-
-    fn as_any_concrete_mut(&mut self) -> &mut dyn Any {
-        self
-    }
-
-    /// Save the state of GICv3ITS.
-    fn state(&self) -> Result<Gicv3ItsState> {
-        let gicr_typers = self.gicr_typers.clone();
-
-        let gicd_ctlr = read_ctlr(&self.device)?;
-
-        let dist_state = get_dist_regs(&self.device)?;
-
-        let rdist_state = get_redist_regs(&self.device, &gicr_typers)?;
-
-        let icc_state = get_icc_regs(&self.device, &gicr_typers)?;
-
-        let its_baser_state: [u64; 8] = [0; 8];
-        for i in 0..8 {
-            gicv3_its_attr_access(
-                self.its_device.as_ref().unwrap(),
-                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-                GITS_BASER + i * 8,
-                &its_baser_state[i as usize],
-                false,
-            )?;
-        }
-
-        let its_ctlr_state: u64 = 0;
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CTLR,
-            &its_ctlr_state,
-            false,
-        )?;
-
-        let its_cbaser_state: u64 = 0;
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CBASER,
-            &its_cbaser_state,
-            false,
-        )?;
-
-        let its_creadr_state: u64 = 0;
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CREADR,
-            &its_creadr_state,
-            false,
-        )?;
-
-        let its_cwriter_state: u64 = 0;
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CWRITER,
-            &its_cwriter_state,
-            false,
-        )?;
-
-        let its_iidr_state: u64 = 0;
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_IIDR,
-            &its_iidr_state,
-            false,
-        )?;
-
-        Ok(Gicv3ItsState {
-            dist: dist_state,
-            rdist: rdist_state,
-            icc: icc_state,
-            gicd_ctlr,
-            its_ctlr: its_ctlr_state,
-            its_iidr: its_iidr_state,
-            its_cbaser: its_cbaser_state,
-            its_cwriter: its_cwriter_state,
-            its_creadr: its_creadr_state,
-            its_baser: its_baser_state,
-        })
-    }
-
-    /// Restore the state of GICv3ITS.
-    fn set_state(&mut self, state: &Gicv3ItsState) -> Result<()> {
-        let gicr_typers = self.gicr_typers.clone();
-
-        write_ctlr(&self.device, state.gicd_ctlr)?;
-
-        set_dist_regs(&self.device, &state.dist)?;
-
-        set_redist_regs(&self.device, &gicr_typers, &state.rdist)?;
-
-        set_icc_regs(&self.device, &gicr_typers, &state.icc)?;
-
-        //Restore GICv3ITS registers
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_IIDR,
-            &state.its_iidr,
-            true,
-        )?;
-
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CBASER,
-            &state.its_cbaser,
-            true,
-        )?;
-
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CREADR,
-            &state.its_creadr,
-            true,
-        )?;
-
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CWRITER,
-            &state.its_cwriter,
-            true,
-        )?;
-
-        for i in 0..8 {
-            gicv3_its_attr_access(
-                self.its_device.as_ref().unwrap(),
-                kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-                GITS_BASER + i * 8,
-                &state.its_baser[i as usize],
-                true,
-            )?;
-        }
-
-        // Restore ITS tables
-        gicv3_its_tables_access(self.its_device.as_ref().unwrap(), false)?;
-
-        gicv3_its_attr_access(
-            self.its_device.as_ref().unwrap(),
-            kvm_bindings::KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
-            GITS_CTLR,
-            &state.its_ctlr,
-            true,
-        )
-    }
-
-    /// Saves GIC internal data tables into RAM, including:
-    /// - RDIST pending tables
-    /// - ITS tables into guest RAM.
-    fn save_data_tables(&self) -> Result<()> {
-        // Flash RDIST pending tables
-        let init_gic_attr = kvm_bindings::kvm_device_attr {
-            group: kvm_bindings::KVM_DEV_ARM_VGIC_GRP_CTRL,
-            attr: u64::from(kvm_bindings::KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES),
-            addr: 0,
-            flags: 0,
-        };
-        self.device.set_device_attr(&init_gic_attr).map_err(|e| {
-            Error::SetDeviceAttribute(HypervisorDeviceError::SetDeviceAttribute(e.into()))
-        })?;
-        // Flush ITS tables to guest RAM.
-        gicv3_its_tables_access(self.its_device.as_ref().unwrap(), true)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::aarch64::gic::{
-        get_dist_regs, get_icc_regs, get_redist_regs, set_dist_regs, set_icc_regs, set_redist_regs,
-    };
-    use crate::kvm::KvmGicV3Its;
-
-    #[test]
-    fn test_create_gic() {
-        let hv = crate::new().unwrap();
-        let vm = hv.create_vm().unwrap();
-
-        assert!(KvmGicV3Its::new(
-            &*vm,
-            1,
-            0x0900_0000 - 0x01_0000,
-            0x01_0000,
-            0x02_0000,
-            0x02_0000,
-            256
-        )
-        .is_ok());
-    }
-
-    #[test]
-    fn test_get_set_dist_regs() {
-        let hv = crate::new().unwrap();
-        let vm = hv.create_vm().unwrap();
-        let _ = vm.create_vcpu(0, None).unwrap();
-        let gic = KvmGicV3Its::new(
-            &*vm,
-            1,
-            0x0900_0000 - 0x01_0000,
-            0x01_0000,
-            0x02_0000,
-            0x02_0000,
-            256,
-        )
-        .expect("Cannot create gic");
-
-        let res = get_dist_regs(&gic.device);
-        assert!(res.is_ok());
-        let state = res.unwrap();
-        assert_eq!(state.len(), 568);
-
-        let res = set_dist_regs(&gic.device, &state);
-        assert!(res.is_ok());
-    }
-
-    #[test]
-    fn test_get_set_redist_regs() {
-        let hv = crate::new().unwrap();
-        let vm = hv.create_vm().unwrap();
-        let _ = vm.create_vcpu(0, None).unwrap();
-        let gic = KvmGicV3Its::new(
-            &*vm,
-            1,
-            0x0900_0000 - 0x01_0000,
-            0x01_0000,
-            0x02_0000,
-            0x02_0000,
-            256,
-        )
-        .expect("Cannot create gic");
-
-        let gicr_typer = vec![123];
-        let res = get_redist_regs(&gic.device, &gicr_typer);
-        assert!(res.is_ok());
-        let state = res.unwrap();
-        println!("{}", state.len());
-        assert!(state.len() == 24);
-
-        assert!(set_redist_regs(&gic.device, &gicr_typer, &state).is_ok());
-    }
-
-    #[test]
-    fn test_get_set_icc_regs() {
-        let hv = crate::new().unwrap();
-        let vm = hv.create_vm().unwrap();
-        let _ = vm.create_vcpu(0, None).unwrap();
-        let gic = KvmGicV3Its::new(
-            &*vm,
-            1,
-            0x0900_0000 - 0x01_0000,
-            0x01_0000,
-            0x02_0000,
-            0x02_0000,
-            256,
-        )
-        .expect("Cannot create gic");
-
-        let gicr_typer = vec![123];
-        let res = get_icc_regs(&gic.device, &gicr_typer);
-        assert!(res.is_ok());
-        let state = res.unwrap();
-        println!("{}", state.len());
-        assert!(state.len() == 9);
-
-        assert!(set_icc_regs(&gic.device, &gicr_typer, &state).is_ok());
-    }
-
-    #[test]
-    fn test_save_data_tables() {
-        let hv = crate::new().unwrap();
-        let vm = hv.create_vm().unwrap();
-        let _ = vm.create_vcpu(0, None).unwrap();
-        let gic = vm
-            .create_vgic(
-                1,
-                0x0900_0000 - 0x01_0000,
-                0x01_0000,
-                0x02_0000,
-                0x02_0000,
-                256,
-            )
-            .expect("Cannot create gic");
-
-        assert!(gic.lock().unwrap().save_data_tables().is_ok());
-    }
-}
--- a/hypervisor/src/kvm/aarch64/mod.rs
+++ b/hypervisor/src/kvm/aarch64/mod.rs
@@ -8,17 +8,22 @@
 //
 //

-pub mod gic;
-
+///
+/// Export generically-named wrappers of kvm-bindings for Unix-based platforms
+///
 use crate::kvm::{KvmError, KvmResult};
 use kvm_bindings::{
-    kvm_mp_state, kvm_one_reg, kvm_regs, KVM_REG_ARM_COPROC_MASK, KVM_REG_ARM_CORE,
-    KVM_REG_SIZE_MASK, KVM_REG_SIZE_U32, KVM_REG_SIZE_U64,
+    kvm_mp_state, kvm_one_reg, kvm_regs, KVM_REG_ARM64, KVM_REG_ARM64_SYSREG,
+    KVM_REG_ARM64_SYSREG_CRM_MASK, KVM_REG_ARM64_SYSREG_CRM_SHIFT, KVM_REG_ARM64_SYSREG_CRN_MASK,
+    KVM_REG_ARM64_SYSREG_CRN_SHIFT, KVM_REG_ARM64_SYSREG_OP0_MASK, KVM_REG_ARM64_SYSREG_OP0_SHIFT,
+    KVM_REG_ARM64_SYSREG_OP1_MASK, KVM_REG_ARM64_SYSREG_OP1_SHIFT, KVM_REG_ARM64_SYSREG_OP2_MASK,
+    KVM_REG_ARM64_SYSREG_OP2_SHIFT, KVM_REG_ARM_COPROC_MASK, KVM_REG_ARM_CORE, KVM_REG_SIZE_MASK,
+    KVM_REG_SIZE_U32, KVM_REG_SIZE_U64,
 };
 pub use kvm_bindings::{
    kvm_one_reg as Register, kvm_regs as StandardRegisters, kvm_vcpu_init as VcpuInit, RegList,
 };
-use serde::{Deserialize, Serialize};
+use serde_derive::{Deserialize, Serialize};
 pub use {kvm_ioctls::Cap, kvm_ioctls::Kvm};

 // This macro gets the offset of a structure (i.e `str`) member (i.e `field`) without having
@@ -81,6 +86,32 @@ macro_rules! arm64_core_reg_id {
    };
 }

+// This macro computes the ID of a specific ARM64 system register similar to how
+// the kernel C macro does.
+// https://elixir.bootlin.com/linux/v4.20.17/source/arch/arm64/include/uapi/asm/kvm.h#L203
+#[macro_export]
+macro_rules! arm64_sys_reg {
+    ($name: tt, $op0: tt, $op1: tt, $crn: tt, $crm: tt, $op2: tt) => {
+        pub const $name: u64 = KVM_REG_ARM64 as u64
+            | KVM_REG_SIZE_U64 as u64
+            | KVM_REG_ARM64_SYSREG as u64
+            | ((($op0 as u64) << KVM_REG_ARM64_SYSREG_OP0_SHIFT)
+                & KVM_REG_ARM64_SYSREG_OP0_MASK as u64)
+            | ((($op1 as u64) << KVM_REG_ARM64_SYSREG_OP1_SHIFT)
+                & KVM_REG_ARM64_SYSREG_OP1_MASK as u64)
+            | ((($crn as u64) << KVM_REG_ARM64_SYSREG_CRN_SHIFT)
+                & KVM_REG_ARM64_SYSREG_CRN_MASK as u64)
+            | ((($crm as u64) << KVM_REG_ARM64_SYSREG_CRM_SHIFT)
+                & KVM_REG_ARM64_SYSREG_CRM_MASK as u64)
+            | ((($op2 as u64) << KVM_REG_ARM64_SYSREG_OP2_SHIFT)
+                & KVM_REG_ARM64_SYSREG_OP2_MASK as u64);
+    };
+}
+
+// Constant imported from the Linux kernel:
+// https://elixir.bootlin.com/linux/v4.20.17/source/arch/arm64/include/asm/sysreg.h#L135
+arm64_sys_reg!(MPIDR_EL1, 3, 0, 0, 0, 5);
+
 /// Specifies whether a particular register is a system register or not.
 /// The kernel splits the registers on aarch64 in core registers and system registers.
 /// So, below we get the system registers by checking that they are not core registers.
@@ -119,4 +150,8 @@ pub struct VcpuKvmState {
    pub mp_state: kvm_mp_state,
    pub core_regs: kvm_regs,
    pub sys_regs: Vec<kvm_one_reg>,
+    // We will be using the mpidr for passing it to the VmState.
+    // The VmState will give this away for saving restoring the icc and redistributor
+    // registers.
+    pub mpidr: u64,
 }
--- a/hypervisor/src/kvm/mod.rs
+++ b/hypervisor/src/kvm/mod.rs
--- a/hypervisor/src/kvm/x86_64/mod.rs
+++ b/hypervisor/src/kvm/x86_64/mod.rs
@@ -8,26 +8,109 @@
 //
 //

-use crate::arch::x86::{
-    CpuIdEntry, DescriptorTable, FpuState, LapicState, MsrEntry, SegmentRegister, SpecialRegisters,
-    StandardRegisters, CPUID_FLAG_VALID_INDEX,
-};
+use crate::arch::x86::{msr_index, SegmentRegisterOps, MTRR_ENABLE, MTRR_MEM_TYPE_WB};
 use crate::kvm::{Cap, Kvm, KvmError, KvmResult};
-use serde::{Deserialize, Serialize};
+use serde_derive::{Deserialize, Serialize};

 ///
 /// Export generically-named wrappers of kvm-bindings for Unix-based platforms
 ///
 pub use {
-    kvm_bindings::kvm_cpuid_entry2, kvm_bindings::kvm_dtable, kvm_bindings::kvm_fpu,
-    kvm_bindings::kvm_lapic_state, kvm_bindings::kvm_mp_state as MpState,
-    kvm_bindings::kvm_msr_entry, kvm_bindings::kvm_regs, kvm_bindings::kvm_segment,
-    kvm_bindings::kvm_sregs, kvm_bindings::kvm_vcpu_events as VcpuEvents,
+    kvm_bindings::kvm_cpuid_entry2 as CpuIdEntry, kvm_bindings::kvm_dtable as DescriptorTable,
+    kvm_bindings::kvm_fpu as FpuState, kvm_bindings::kvm_lapic_state as LapicState,
+    kvm_bindings::kvm_mp_state as MpState, kvm_bindings::kvm_msr_entry as MsrEntry,
+    kvm_bindings::kvm_regs as StandardRegisters, kvm_bindings::kvm_segment as SegmentRegister,
+    kvm_bindings::kvm_sregs as SpecialRegisters, kvm_bindings::kvm_vcpu_events as VcpuEvents,
    kvm_bindings::kvm_xcrs as ExtendedControlRegisters, kvm_bindings::kvm_xsave as Xsave,
    kvm_bindings::CpuId, kvm_bindings::MsrList, kvm_bindings::Msrs as MsrEntries,
-    kvm_bindings::KVM_CPUID_FLAG_SIGNIFCANT_INDEX,
+    kvm_bindings::KVM_CPUID_FLAG_SIGNIFCANT_INDEX as CPUID_FLAG_VALID_INDEX,
 };

+impl SegmentRegisterOps for SegmentRegister {
+    fn segment_type(&self) -> u8 {
+        self.type_
+    }
+    fn set_segment_type(&mut self, val: u8) {
+        self.type_ = val;
+    }
+
+    fn dpl(&self) -> u8 {
+        self.dpl
+    }
+
+    fn set_dpl(&mut self, val: u8) {
+        self.dpl = val;
+    }
+
+    fn present(&self) -> u8 {
+        self.present
+    }
+
+    fn set_present(&mut self, val: u8) {
+        self.present = val;
+    }
+
+    fn long(&self) -> u8 {
+        self.l
+    }
+
+    fn set_long(&mut self, val: u8) {
+        self.l = val;
+    }
+
+    fn avl(&self) -> u8 {
+        self.avl
+    }
+
+    fn set_avl(&mut self, val: u8) {
+        self.avl = val;
+    }
+
+    fn desc_type(&self) -> u8 {
+        self.s
+    }
+
+    fn set_desc_type(&mut self, val: u8) {
+        self.s = val;
+    }
+
+    fn granularity(&self) -> u8 {
+        self.g
+    }
+
+    fn set_granularity(&mut self, val: u8) {
+        self.g = val;
+    }
+
+    fn db(&self) -> u8 {
+        self.db
+    }
+
+    fn set_db(&mut self, val: u8) {
+        self.db = val;
+    }
+}
+
+pub fn boot_msr_entries() -> MsrEntries {
+    MsrEntries::from_entries(&[
+        msr!(msr_index::MSR_IA32_SYSENTER_CS),
+        msr!(msr_index::MSR_IA32_SYSENTER_ESP),
+        msr!(msr_index::MSR_IA32_SYSENTER_EIP),
+        msr!(msr_index::MSR_STAR),
+        msr!(msr_index::MSR_CSTAR),
+        msr!(msr_index::MSR_LSTAR),
+        msr!(msr_index::MSR_KERNEL_GS_BASE),
+        msr!(msr_index::MSR_SYSCALL_MASK),
+        msr!(msr_index::MSR_IA32_TSC),
+        msr_data!(
+            msr_index::MSR_IA32_MISC_ENABLE,
+            msr_index::MSR_IA32_MISC_ENABLE_FAST_STRING as u64
+        ),
+        msr_data!(msr_index::MSR_MTRRdefType, MTRR_ENABLE | MTRR_MEM_TYPE_WB),
+    ])
+    .unwrap()
+}
+
 ///
 /// Check KVM extension for Linux
 ///
@@ -54,275 +137,14 @@ pub fn check_required_kvm_extensions(kvm: &Kvm) -> KvmResult<()> {
 }
 #[derive(Clone, Serialize, Deserialize)]
 pub struct VcpuKvmState {
-    pub cpuid: Vec<CpuIdEntry>,
-    pub msrs: Vec<MsrEntry>,
+    pub cpuid: CpuId,
+    pub msrs: MsrEntries,
    pub vcpu_events: VcpuEvents,
-    pub regs: kvm_regs,
-    pub sregs: kvm_sregs,
+    pub regs: StandardRegisters,
+    pub sregs: SpecialRegisters,
    pub fpu: FpuState,
    pub lapic_state: LapicState,
    pub xsave: Xsave,
    pub xcrs: ExtendedControlRegisters,
    pub mp_state: MpState,
 }
-
-impl From<StandardRegisters> for kvm_regs {
-    fn from(regs: StandardRegisters) -> Self {
-        Self {
-            rax: regs.rax,
-            rbx: regs.rbx,
-            rcx: regs.rcx,
-            rdx: regs.rdx,
-            rsi: regs.rsi,
-            rdi: regs.rdi,
-            rsp: regs.rsp,
-            rbp: regs.rbp,
-            r8: regs.r8,
-            r9: regs.r9,
-            r10: regs.r10,
-            r11: regs.r11,
-            r12: regs.r12,
-            r13: regs.r13,
-            r14: regs.r14,
-            r15: regs.r15,
-            rip: regs.rip,
-            rflags: regs.rflags,
-        }
-    }
-}
-
-impl From<kvm_regs> for StandardRegisters {
-    fn from(regs: kvm_regs) -> Self {
-        Self {
-            rax: regs.rax,
-            rbx: regs.rbx,
-            rcx: regs.rcx,
-            rdx: regs.rdx,
-            rsi: regs.rsi,
-            rdi: regs.rdi,
-            rsp: regs.rsp,
-            rbp: regs.rbp,
-            r8: regs.r8,
-            r9: regs.r9,
-            r10: regs.r10,
-            r11: regs.r11,
-            r12: regs.r12,
-            r13: regs.r13,
-            r14: regs.r14,
-            r15: regs.r15,
-            rip: regs.rip,
-            rflags: regs.rflags,
-        }
-    }
-}
-
-impl From<SegmentRegister> for kvm_segment {
-    fn from(s: SegmentRegister) -> Self {
-        Self {
-            base: s.base,
-            limit: s.limit,
-            selector: s.selector,
-            type_: s.type_,
-            present: s.present,
-            dpl: s.dpl,
-            db: s.db,
-            s: s.s,
-            l: s.l,
-            g: s.g,
-            avl: s.avl,
-            unusable: s.unusable,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<kvm_segment> for SegmentRegister {
-    fn from(s: kvm_segment) -> Self {
-        Self {
-            base: s.base,
-            limit: s.limit,
-            selector: s.selector,
-            type_: s.type_,
-            present: s.present,
-            dpl: s.dpl,
-            db: s.db,
-            s: s.s,
-            l: s.l,
-            g: s.g,
-            avl: s.avl,
-            unusable: s.unusable,
-        }
-    }
-}
-
-impl From<DescriptorTable> for kvm_dtable {
-    fn from(dt: DescriptorTable) -> Self {
-        Self {
-            base: dt.base,
-            limit: dt.limit,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<kvm_dtable> for DescriptorTable {
-    fn from(dt: kvm_dtable) -> Self {
-        Self {
-            base: dt.base,
-            limit: dt.limit,
-        }
-    }
-}
-
-impl From<SpecialRegisters> for kvm_sregs {
-    fn from(s: SpecialRegisters) -> Self {
-        Self {
-            cs: s.cs.into(),
-            ds: s.ds.into(),
-            es: s.es.into(),
-            fs: s.fs.into(),
-            gs: s.gs.into(),
-            ss: s.ss.into(),
-            tr: s.tr.into(),
-            ldt: s.ldt.into(),
-            gdt: s.gdt.into(),
-            idt: s.idt.into(),
-            cr0: s.cr0,
-            cr2: s.cr2,
-            cr3: s.cr3,
-            cr4: s.cr4,
-            cr8: s.cr8,
-            efer: s.efer,
-            apic_base: s.apic_base,
-            interrupt_bitmap: s.interrupt_bitmap,
-        }
-    }
-}
-
-impl From<kvm_sregs> for SpecialRegisters {
-    fn from(s: kvm_sregs) -> Self {
-        Self {
-            cs: s.cs.into(),
-            ds: s.ds.into(),
-            es: s.es.into(),
-            fs: s.fs.into(),
-            gs: s.gs.into(),
-            ss: s.ss.into(),
-            tr: s.tr.into(),
-            ldt: s.ldt.into(),
-            gdt: s.gdt.into(),
-            idt: s.idt.into(),
-            cr0: s.cr0,
-            cr2: s.cr2,
-            cr3: s.cr3,
-            cr4: s.cr4,
-            cr8: s.cr8,
-            efer: s.efer,
-            apic_base: s.apic_base,
-            interrupt_bitmap: s.interrupt_bitmap,
-        }
-    }
-}
-
-impl From<CpuIdEntry> for kvm_cpuid_entry2 {
-    fn from(e: CpuIdEntry) -> Self {
-        let flags = if e.flags & CPUID_FLAG_VALID_INDEX != 0 {
-            KVM_CPUID_FLAG_SIGNIFCANT_INDEX
-        } else {
-            0
-        };
-        Self {
-            function: e.function,
-            index: e.index,
-            flags,
-            eax: e.eax,
-            ebx: e.ebx,
-            ecx: e.ecx,
-            edx: e.edx,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<kvm_cpuid_entry2> for CpuIdEntry {
-    fn from(e: kvm_cpuid_entry2) -> Self {
-        let flags = if e.flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX != 0 {
-            CPUID_FLAG_VALID_INDEX
-        } else {
-            0
-        };
-        Self {
-            function: e.function,
-            index: e.index,
-            flags,
-            eax: e.eax,
-            ebx: e.ebx,
-            ecx: e.ecx,
-            edx: e.edx,
-        }
-    }
-}
-
-impl From<kvm_fpu> for FpuState {
-    fn from(s: kvm_fpu) -> Self {
-        Self {
-            fpr: s.fpr,
-            fcw: s.fcw,
-            fsw: s.fsw,
-            ftwx: s.ftwx,
-            last_opcode: s.last_opcode,
-            last_ip: s.last_ip,
-            last_dp: s.last_dp,
-            xmm: s.xmm,
-            mxcsr: s.mxcsr,
-        }
-    }
-}
-
-impl From<FpuState> for kvm_fpu {
-    fn from(s: FpuState) -> Self {
-        Self {
-            fpr: s.fpr,
-            fcw: s.fcw,
-            fsw: s.fsw,
-            ftwx: s.ftwx,
-            last_opcode: s.last_opcode,
-            last_ip: s.last_ip,
-            last_dp: s.last_dp,
-            xmm: s.xmm,
-            mxcsr: s.mxcsr,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<LapicState> for kvm_lapic_state {
-    fn from(s: LapicState) -> Self {
-        Self { regs: s.regs }
-    }
-}
-
-impl From<kvm_lapic_state> for LapicState {
-    fn from(s: kvm_lapic_state) -> Self {
-        Self { regs: s.regs }
-    }
-}
-
-impl From<kvm_msr_entry> for MsrEntry {
-    fn from(e: kvm_msr_entry) -> Self {
-        Self {
-            index: e.index,
-            data: e.data,
-        }
-    }
-}
-
-impl From<MsrEntry> for kvm_msr_entry {
-    fn from(e: MsrEntry) -> Self {
-        Self {
-            index: e.index,
-            data: e.data,
-            ..Default::default()
-        }
-    }
-}
--- a/hypervisor/src/lib.rs
+++ b/hypervisor/src/lib.rs
@@ -18,8 +18,6 @@
 //! - arm64
 //!

-#![allow(clippy::significant_drop_in_scrutinee)]
-
 #[macro_use]
 extern crate anyhow;
 #[cfg(target_arch = "x86_64")]
@@ -39,10 +37,10 @@ pub mod kvm;
 pub mod mshv;

 /// Hypevisor related module
-mod hypervisor;
+pub mod hypervisor;

 /// Vm related module
-mod vm;
+pub mod vm;

 /// CPU related module
 mod cpu;
@@ -50,37 +48,27 @@ mod cpu;
 /// Device related module
 mod device;

+pub use crate::hypervisor::{Hypervisor, HypervisorError};
 pub use cpu::{HypervisorCpuError, Vcpu, VmExit};
-pub use device::HypervisorDeviceError;
-pub use hypervisor::{Hypervisor, HypervisorError};
-#[cfg(all(feature = "kvm", target_arch = "aarch64"))]
-pub use kvm::{aarch64, GicState};
-use std::sync::Arc;
-pub use vm::{
-    DataMatch, HypervisorVmError, InterruptSourceConfig, LegacyIrqSourceConfig, MsiIrqSourceConfig,
-    Vm, VmOps,
-};
+pub use device::{Device, HypervisorDeviceError};
+#[cfg(feature = "tdx")]
+pub use kvm::TdxCapabilities;
+#[cfg(feature = "kvm")]
+pub use kvm::*;
+#[cfg(all(feature = "mshv", target_arch = "x86_64"))]
+pub use mshv::*;
+pub use vm::{DataMatch, HypervisorVmError, Vm};

-#[derive(Debug, Copy, Clone)]
-pub enum HypervisorType {
-    Kvm,
-    Mshv,
-}
+use std::sync::Arc;

 pub fn new() -> std::result::Result<Arc<dyn Hypervisor>, HypervisorError> {
    #[cfg(feature = "kvm")]
-    if kvm::KvmHypervisor::is_available()? {
-        return kvm::KvmHypervisor::new();
-    }
+    let hv = kvm::KvmHypervisor::new()?;

    #[cfg(feature = "mshv")]
-    if mshv::MshvHypervisor::is_available()? {
-        return mshv::MshvHypervisor::new();
-    }
+    let hv = mshv::MshvHypervisor::new()?;

-    Err(HypervisorError::HypervisorCreate(anyhow!(
-        "no supported hypervisor"
-    )))
+    Ok(Arc::new(hv))
 }

 // Returns a `Vec<T>` with a size in bytes at least as large as `size_in_bytes`.
@@ -112,75 +100,3 @@ pub fn vec_with_array_field<T: Default, F>(count: usize) -> Vec<T> {
    let vec_size_bytes = size_of::<T>() + element_space;
    vec_with_size_in_bytes(vec_size_bytes)
 }
-
-///
-/// User memory region structure
-///
-#[derive(Debug, Default, Eq, PartialEq)]
-pub struct UserMemoryRegion {
-    pub slot: u32,
-    pub guest_phys_addr: u64,
-    pub memory_size: u64,
-    pub userspace_addr: u64,
-    pub flags: u32,
-}
-
-///
-/// Flags for user memory region
-///
-pub const USER_MEMORY_REGION_READ: u32 = 1;
-pub const USER_MEMORY_REGION_WRITE: u32 = 1 << 1;
-pub const USER_MEMORY_REGION_EXECUTE: u32 = 1 << 2;
-pub const USER_MEMORY_REGION_LOG_DIRTY: u32 = 1 << 3;
-
-#[derive(Debug)]
-pub enum MpState {
-    #[cfg(feature = "kvm")]
-    Kvm(kvm_bindings::kvm_mp_state),
-    #[cfg(all(feature = "mshv", target_arch = "x86_64"))]
-    Mshv, /* MSHV does not supprt MpState yet */
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum IoEventAddress {
-    Pio(u64),
-    Mmio(u64),
-}
-
-#[derive(Clone, serde::Serialize, serde::Deserialize)]
-#[allow(clippy::large_enum_variant)]
-pub enum CpuState {
-    #[cfg(feature = "kvm")]
-    Kvm(kvm::VcpuKvmState),
-    #[cfg(all(feature = "mshv", target_arch = "x86_64"))]
-    Mshv(mshv::VcpuMshvState),
-}
-
-#[derive(Debug, Clone, Copy, serde::Serialize, serde::Deserialize)]
-#[cfg(target_arch = "x86_64")]
-pub enum ClockData {
-    #[cfg(feature = "kvm")]
-    Kvm(kvm_bindings::kvm_clock_data),
-    #[cfg(feature = "mshv")]
-    Mshv, /* MSHV does not supprt ClockData yet */
-}
-
-#[cfg(target_arch = "x86_64")]
-impl ClockData {
-    pub fn reset_flags(&mut self) {
-        match self {
-            #[cfg(feature = "kvm")]
-            ClockData::Kvm(s) => s.flags = 0,
-            #[allow(unreachable_patterns)]
-            _ => {}
-        }
-    }
-}
-
-#[derive(Copy, Clone)]
-pub enum IrqRoutingEntry {
-    #[cfg(feature = "kvm")]
-    Kvm(kvm_bindings::kvm_irq_routing_entry),
-    #[cfg(feature = "mshv")]
-    Mshv(mshv_bindings::mshv_msi_routing_entry),
-}
--- a/hypervisor/src/mshv/mod.rs
+++ b/hypervisor/src/mshv/mod.rs
@@ -11,36 +11,27 @@ use crate::cpu;
 use crate::cpu::Vcpu;
 use crate::hypervisor;
 use crate::vec_with_array_field;
-use crate::vm::{self, InterruptSourceConfig, VmOps};
-use crate::HypervisorType;
+use crate::vm::{self, VmmOps};
 pub use mshv_bindings::*;
+pub use mshv_ioctls::IoEventAddress;
 use mshv_ioctls::{set_registers_64, Mshv, NoDatamatch, VcpuFd, VmFd};
-use std::any::Any;
+use serde_derive::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::sync::{Arc, RwLock};
-use vfio_ioctls::VfioDeviceFd;
 use vm::DataMatch;
 // x86_64 dependencies
 #[cfg(target_arch = "x86_64")]
 pub mod x86_64;
-use crate::{
-    ClockData, CpuState, IoEventAddress, IrqRoutingEntry, MpState, UserMemoryRegion,
-    USER_MEMORY_REGION_EXECUTE, USER_MEMORY_REGION_READ, USER_MEMORY_REGION_WRITE,
-};
+use crate::device;
 use vmm_sys_util::eventfd::EventFd;
 #[cfg(target_arch = "x86_64")]
-pub use x86_64::VcpuMshvState;
+pub use x86_64::VcpuMshvState as CpuState;
 #[cfg(target_arch = "x86_64")]
 pub use x86_64::*;

 #[cfg(target_arch = "x86_64")]
 use std::fs::File;
-use std::os::unix::io::AsRawFd;
-
-#[cfg(target_arch = "x86_64")]
-use crate::arch::x86::{
-    CpuIdEntry, FpuState, LapicState, MsrEntry, SpecialRegisters, StandardRegisters,
-};
+use std::os::unix::io::{AsRawFd, RawFd};

 const DIRTY_BITMAP_CLEAR_DIRTY: u64 = 0x4;
 const DIRTY_BITMAP_SET_DIRTY: u64 = 0x8;
@@ -50,108 +41,18 @@ const DIRTY_BITMAP_SET_DIRTY: u64 = 0x8;
 ///
 pub use {
    mshv_bindings::mshv_create_device as CreateDevice,
-    mshv_bindings::mshv_device_attr as DeviceAttr, mshv_ioctls::DeviceFd,
+    mshv_bindings::mshv_device_attr as DeviceAttr,
+    mshv_bindings::mshv_msi_routing_entry as IrqRoutingEntry, mshv_ioctls::DeviceFd,
 };

 pub const PAGE_SHIFT: usize = 12;

-impl From<mshv_user_mem_region> for UserMemoryRegion {
-    fn from(region: mshv_user_mem_region) -> Self {
-        let mut flags: u32 = 0;
-        if region.flags & HV_MAP_GPA_READABLE != 0 {
-            flags |= USER_MEMORY_REGION_READ;
-        }
-        if region.flags & HV_MAP_GPA_WRITABLE != 0 {
-            flags |= USER_MEMORY_REGION_WRITE;
-        }
-        if region.flags & HV_MAP_GPA_EXECUTABLE != 0 {
-            flags |= USER_MEMORY_REGION_EXECUTE;
-        }
-
-        UserMemoryRegion {
-            guest_phys_addr: (region.guest_pfn << PAGE_SHIFT as u64)
-                + (region.userspace_addr & ((1 << PAGE_SHIFT) - 1)),
-            memory_size: region.size,
-            userspace_addr: region.userspace_addr,
-            flags,
-            ..Default::default()
-        }
-    }
+#[derive(Debug, Default, Copy, Clone, Serialize, Deserialize)]
+pub struct HvState {
+    hypercall_page: u64,
 }

-impl From<UserMemoryRegion> for mshv_user_mem_region {
-    fn from(region: UserMemoryRegion) -> Self {
-        let mut flags: u32 = 0;
-        if region.flags & USER_MEMORY_REGION_READ != 0 {
-            flags |= HV_MAP_GPA_READABLE;
-        }
-        if region.flags & USER_MEMORY_REGION_WRITE != 0 {
-            flags |= HV_MAP_GPA_WRITABLE;
-        }
-        if region.flags & USER_MEMORY_REGION_EXECUTE != 0 {
-            flags |= HV_MAP_GPA_EXECUTABLE;
-        }
-
-        mshv_user_mem_region {
-            guest_pfn: region.guest_phys_addr >> PAGE_SHIFT,
-            size: region.memory_size,
-            userspace_addr: region.userspace_addr,
-            flags,
-        }
-    }
-}
-
-impl From<mshv_ioctls::IoEventAddress> for IoEventAddress {
-    fn from(a: mshv_ioctls::IoEventAddress) -> Self {
-        match a {
-            mshv_ioctls::IoEventAddress::Pio(x) => Self::Pio(x),
-            mshv_ioctls::IoEventAddress::Mmio(x) => Self::Mmio(x),
-        }
-    }
-}
-
-impl From<IoEventAddress> for mshv_ioctls::IoEventAddress {
-    fn from(a: IoEventAddress) -> Self {
-        match a {
-            IoEventAddress::Pio(x) => Self::Pio(x),
-            IoEventAddress::Mmio(x) => Self::Mmio(x),
-        }
-    }
-}
-
-impl From<VcpuMshvState> for CpuState {
-    fn from(s: VcpuMshvState) -> Self {
-        CpuState::Mshv(s)
-    }
-}
-
-impl From<CpuState> for VcpuMshvState {
-    fn from(s: CpuState) -> Self {
-        match s {
-            CpuState::Mshv(s) => s,
-            /* Needed in case other hypervisors are enabled */
-            #[allow(unreachable_patterns)]
-            _ => panic!("CpuState is not valid"),
-        }
-    }
-}
-
-impl From<mshv_msi_routing_entry> for IrqRoutingEntry {
-    fn from(s: mshv_msi_routing_entry) -> Self {
-        IrqRoutingEntry::Mshv(s)
-    }
-}
-
-impl From<IrqRoutingEntry> for mshv_msi_routing_entry {
-    fn from(e: IrqRoutingEntry) -> Self {
-        match e {
-            IrqRoutingEntry::Mshv(e) => e,
-            /* Needed in case other hypervisors are enabled */
-            #[allow(unreachable_patterns)]
-            _ => panic!("IrqRoutingEntry is not valid"),
-        }
-    }
-}
+pub use HvState as VmState;

 struct MshvDirtyLogSlot {
    guest_pfn: u64,
@@ -163,35 +64,12 @@ pub struct MshvHypervisor {
    mshv: Mshv,
 }

-impl MshvHypervisor {
-    #[cfg(target_arch = "x86_64")]
-    ///
-    /// Retrieve the list of MSRs supported by MSHV.
-    ///
-    fn get_msr_list(&self) -> hypervisor::Result<MsrList> {
-        self.mshv
-            .get_msr_index_list()
-            .map_err(|e| hypervisor::HypervisorError::GetMsrList(e.into()))
-    }
-}
-
 impl MshvHypervisor {
    /// Create a hypervisor based on Mshv
-    #[allow(clippy::new_ret_no_self)]
-    pub fn new() -> hypervisor::Result<Arc<dyn hypervisor::Hypervisor>> {
+    pub fn new() -> hypervisor::Result<MshvHypervisor> {
        let mshv_obj =
            Mshv::new().map_err(|e| hypervisor::HypervisorError::HypervisorCreate(e.into()))?;
-        Ok(Arc::new(MshvHypervisor { mshv: mshv_obj }))
-    }
-    /// Check if the hypervisor is available
-    pub fn is_available() -> hypervisor::Result<bool> {
-        match std::fs::metadata("/dev/mshv") {
-            Ok(_) => Ok(true),
-            Err(err) if err.kind() == std::io::ErrorKind::NotFound => Ok(false),
-            Err(err) => Err(hypervisor::HypervisorError::HypervisorAvailableCheck(
-                err.into(),
-            )),
-        }
+        Ok(MshvHypervisor { mshv: mshv_obj })
    }
 }
 /// Implementation of Hypervisor trait for Mshv
@@ -203,12 +81,6 @@ impl MshvHypervisor {
 /// let vm = hypervisor.create_vm().expect("new VM fd creation failed");
 ///
 impl hypervisor::Hypervisor for MshvHypervisor {
-    ///
-    /// Returns the type of the hypervisor
-    ///
-    fn hypervisor_type(&self) -> HypervisorType {
-        HypervisorType::Mshv
-    }
    /// Create a mshv vm object and return the object as Vm trait object
    /// Example
    /// # extern crate hypervisor;
@@ -236,52 +108,50 @@ impl hypervisor::Hypervisor for MshvHypervisor {
            break;
        }

-        // Default Microsoft Hypervisor behavior for unimplemented MSR is to
-        // send a fault to the guest if it tries to access it. It is possible
-        // to override this behavior with a more suitable option i.e., ignore
-        // writes from the guest and return zero in attempt to read unimplemented
-        // MSR.
-        fd.set_partition_property(
-            hv_partition_property_code_HV_PARTITION_PROPERTY_UNIMPLEMENTED_MSR_ACTION,
-            hv_unimplemented_msr_action_HV_UNIMPLEMENTED_MSR_ACTION_IGNORE_WRITE_READ_ZERO as u64,
-        )
-        .map_err(|e| hypervisor::HypervisorError::SetPartitionProperty(e.into()))?;
-
        let msr_list = self.get_msr_list()?;
        let num_msrs = msr_list.as_fam_struct_ref().nmsrs as usize;
-        let mut msrs: Vec<MsrEntry> = vec![
-            MsrEntry {
-                ..Default::default()
-            };
-            num_msrs
-        ];
+        let mut msrs = MsrEntries::new(num_msrs).unwrap();
        let indices = msr_list.as_slice();
+        let msr_entries = msrs.as_mut_slice();
        for (pos, index) in indices.iter().enumerate() {
-            msrs[pos].index = *index;
+            msr_entries[pos].index = *index;
        }
        let vm_fd = Arc::new(fd);

        Ok(Arc::new(MshvVm {
            fd: vm_fd,
            msrs,
+            hv_state: hv_state_init(),
+            vmmops: None,
            dirty_log_slots: Arc::new(RwLock::new(HashMap::new())),
        }))
    }
    ///
    /// Get the supported CpuID
    ///
-    fn get_cpuid(&self) -> hypervisor::Result<Vec<CpuIdEntry>> {
-        Ok(Vec::new())
+    fn get_cpuid(&self) -> hypervisor::Result<CpuId> {
+        Ok(CpuId::new(1).unwrap())
+    }
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// Retrieve the list of MSRs supported by MSHV.
+    ///
+    fn get_msr_list(&self) -> hypervisor::Result<MsrList> {
+        self.mshv
+            .get_msr_index_list()
+            .map_err(|e| hypervisor::HypervisorError::GetMsrList(e.into()))
    }
 }

+#[allow(dead_code)]
 /// Vcpu struct for Microsoft Hypervisor
 pub struct MshvVcpu {
    fd: VcpuFd,
    vp_index: u8,
-    cpuid: Vec<CpuIdEntry>,
-    msrs: Vec<MsrEntry>,
-    vm_ops: Option<Arc<dyn vm::VmOps>>,
+    cpuid: CpuId,
+    msrs: MsrEntries,
+    hv_state: Arc<RwLock<HvState>>, // Mshv State
+    vmmops: Option<Arc<dyn vm::VmmOps>>,
 }

 /// Implementation of Vcpu trait for Microsoft Hypervisor
@@ -300,20 +170,17 @@ impl cpu::Vcpu for MshvVcpu {
    /// Returns the vCPU general purpose registers.
    ///
    fn get_regs(&self) -> cpu::Result<StandardRegisters> {
-        Ok(self
-            .fd
+        self.fd
            .get_regs()
-            .map_err(|e| cpu::HypervisorCpuError::GetStandardRegs(e.into()))?
-            .into())
+            .map_err(|e| cpu::HypervisorCpuError::GetStandardRegs(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// Sets the vCPU general purpose registers.
    ///
    fn set_regs(&self, regs: &StandardRegisters) -> cpu::Result<()> {
-        let regs = (*regs).into();
        self.fd
-            .set_regs(&regs)
+            .set_regs(regs)
            .map_err(|e| cpu::HypervisorCpuError::SetStandardRegs(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
@@ -321,20 +188,17 @@ impl cpu::Vcpu for MshvVcpu {
    /// Returns the vCPU special registers.
    ///
    fn get_sregs(&self) -> cpu::Result<SpecialRegisters> {
-        Ok(self
-            .fd
+        self.fd
            .get_sregs()
-            .map_err(|e| cpu::HypervisorCpuError::GetSpecialRegs(e.into()))?
-            .into())
+            .map_err(|e| cpu::HypervisorCpuError::GetSpecialRegs(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// Sets the vCPU special registers.
    ///
    fn set_sregs(&self, sregs: &SpecialRegisters) -> cpu::Result<()> {
-        let sregs = (*sregs).into();
        self.fd
-            .set_sregs(&sregs)
+            .set_sregs(sregs)
            .map_err(|e| cpu::HypervisorCpuError::SetSpecialRegs(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
@@ -342,20 +206,17 @@ impl cpu::Vcpu for MshvVcpu {
    /// Returns the floating point state (FPU) from the vCPU.
    ///
    fn get_fpu(&self) -> cpu::Result<FpuState> {
-        Ok(self
-            .fd
+        self.fd
            .get_fpu()
-            .map_err(|e| cpu::HypervisorCpuError::GetFloatingPointRegs(e.into()))?
-            .into())
+            .map_err(|e| cpu::HypervisorCpuError::GetFloatingPointRegs(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// Set the floating point state (FPU) of a vCPU.
    ///
    fn set_fpu(&self, fpu: &FpuState) -> cpu::Result<()> {
-        let fpu: mshv_bindings::FloatingPointUnit = (*fpu).clone().into();
        self.fd
-            .set_fpu(&fpu)
+            .set_fpu(fpu)
            .map_err(|e| cpu::HypervisorCpuError::SetFloatingPointRegs(e.into()))
    }

@@ -363,36 +224,60 @@ impl cpu::Vcpu for MshvVcpu {
    ///
    /// Returns the model-specific registers (MSR) for this vCPU.
    ///
-    fn get_msrs(&self, msrs: &mut Vec<MsrEntry>) -> cpu::Result<usize> {
-        let mshv_msrs: Vec<msr_entry> = msrs.iter().map(|e| (*e).into()).collect();
-        let mut mshv_msrs = MsrEntries::from_entries(&mshv_msrs).unwrap();
-        let succ = self
-            .fd
-            .get_msrs(&mut mshv_msrs)
-            .map_err(|e| cpu::HypervisorCpuError::GetMsrEntries(e.into()))?;
-
-        msrs[..succ].copy_from_slice(
-            &mshv_msrs.as_slice()[..succ]
-                .iter()
-                .map(|e| (*e).into())
-                .collect::<Vec<MsrEntry>>(),
-        );
-
-        Ok(succ)
+    fn get_msrs(&self, msrs: &mut MsrEntries) -> cpu::Result<usize> {
+        self.fd
+            .get_msrs(msrs)
+            .map_err(|e| cpu::HypervisorCpuError::GetMsrEntries(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// Setup the model-specific registers (MSR) for this vCPU.
    /// Returns the number of MSR entries actually written.
    ///
-    fn set_msrs(&self, msrs: &[MsrEntry]) -> cpu::Result<usize> {
-        let mshv_msrs: Vec<msr_entry> = msrs.iter().map(|e| (*e).into()).collect();
-        let mshv_msrs = MsrEntries::from_entries(&mshv_msrs).unwrap();
+    fn set_msrs(&self, msrs: &MsrEntries) -> cpu::Result<usize> {
        self.fd
-            .set_msrs(&mshv_msrs)
+            .set_msrs(msrs)
            .map_err(|e| cpu::HypervisorCpuError::SetMsrEntries(e.into()))
    }

+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// X86 specific call that returns the vcpu's current "xcrs".
+    ///
+    fn get_xcrs(&self) -> cpu::Result<ExtendedControlRegisters> {
+        self.fd
+            .get_xcrs()
+            .map_err(|e| cpu::HypervisorCpuError::GetXcsr(e.into()))
+    }
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// X86 specific call that sets the vcpu's current "xcrs".
+    ///
+    fn set_xcrs(&self, xcrs: &ExtendedControlRegisters) -> cpu::Result<()> {
+        self.fd
+            .set_xcrs(xcrs)
+            .map_err(|e| cpu::HypervisorCpuError::SetXcsr(e.into()))
+    }
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// Returns currently pending exceptions, interrupts, and NMIs as well as related
+    /// states of the vcpu.
+    ///
+    fn get_vcpu_events(&self) -> cpu::Result<VcpuEvents> {
+        self.fd
+            .get_vcpu_events()
+            .map_err(|e| cpu::HypervisorCpuError::GetVcpuEvents(e.into()))
+    }
+    #[cfg(target_arch = "x86_64")]
+    ///
+    /// Sets pending exceptions, interrupts, and NMIs as well as related states
+    /// of the vcpu.
+    ///
+    fn set_vcpu_events(&self, events: &VcpuEvents) -> cpu::Result<()> {
+        self.fd
+            .set_vcpu_events(events)
+            .map_err(|e| cpu::HypervisorCpuError::SetVcpuEvents(e.into()))
+    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// X86 specific call to enable HyperV SynIC
@@ -470,14 +355,14 @@ impl cpu::Vcpu for MshvVcpu {

                    if is_write {
                        let data = (info.rax as u32).to_le_bytes();
-                        if let Some(vm_ops) = &self.vm_ops {
-                            vm_ops
+                        if let Some(vmmops) = &self.vmmops {
+                            vmmops
                                .pio_write(port.into(), &data[0..len])
                                .map_err(|e| cpu::HypervisorCpuError::RunVcpu(e.into()))?;
                        }
                    } else {
-                        if let Some(vm_ops) = &self.vm_ops {
-                            vm_ops
+                        if let Some(vmmops) = &self.vmmops {
+                            vmmops
                                .pio_read(port.into(), &mut data[0..len])
                                .map_err(|e| cpu::HypervisorCpuError::RunVcpu(e.into()))?;
                        }
@@ -567,14 +452,14 @@ impl cpu::Vcpu for MshvVcpu {
    ///
    /// X86 specific call to setup the CPUID registers.
    ///
-    fn set_cpuid2(&self, _cpuid: &[CpuIdEntry]) -> cpu::Result<()> {
+    fn set_cpuid2(&self, _cpuid: &CpuId) -> cpu::Result<()> {
        Ok(())
    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// X86 specific call to retrieve the CPUID registers.
    ///
-    fn get_cpuid2(&self, _num_entries: usize) -> cpu::Result<Vec<CpuIdEntry>> {
+    fn get_cpuid2(&self, _num_entries: usize) -> cpu::Result<CpuId> {
        Ok(self.cpuid.clone())
    }
    #[cfg(target_arch = "x86_64")]
@@ -582,43 +467,45 @@ impl cpu::Vcpu for MshvVcpu {
    /// Returns the state of the LAPIC (Local Advanced Programmable Interrupt Controller).
    ///
    fn get_lapic(&self) -> cpu::Result<LapicState> {
-        Ok(self
-            .fd
+        self.fd
            .get_lapic()
-            .map_err(|e| cpu::HypervisorCpuError::GetlapicState(e.into()))?
-            .into())
+            .map_err(|e| cpu::HypervisorCpuError::GetlapicState(e.into()))
    }
    #[cfg(target_arch = "x86_64")]
    ///
    /// Sets the state of the LAPIC (Local Advanced Programmable Interrupt Controller).
    ///
    fn set_lapic(&self, lapic: &LapicState) -> cpu::Result<()> {
-        let lapic: mshv_bindings::LapicState = (*lapic).clone().into();
        self.fd
-            .set_lapic(&lapic)
+            .set_lapic(lapic)
            .map_err(|e| cpu::HypervisorCpuError::SetLapicState(e.into()))
    }
+    #[cfg(target_arch = "x86_64")]
    ///
-    /// Returns the vcpu's current "multiprocessing state".
+    /// X86 specific call that returns the vcpu's current "xsave struct".
    ///
-    fn get_mp_state(&self) -> cpu::Result<MpState> {
-        Ok(MpState::Mshv)
+    fn get_xsave(&self) -> cpu::Result<Xsave> {
+        self.fd
+            .get_xsave()
+            .map_err(|e| cpu::HypervisorCpuError::GetXsaveState(e.into()))
    }
+    #[cfg(target_arch = "x86_64")]
    ///
-    /// Sets the vcpu's current "multiprocessing state".
+    /// X86 specific call that sets the vcpu's current "xsave struct".
    ///
-    fn set_mp_state(&self, _mp_state: MpState) -> cpu::Result<()> {
-        Ok(())
+    fn set_xsave(&self, xsave: &Xsave) -> cpu::Result<()> {
+        self.fd
+            .set_xsave(xsave)
+            .map_err(|e| cpu::HypervisorCpuError::SetXsaveState(e.into()))
    }
    ///
    /// Set CPU state
    ///
    fn set_state(&self, state: &CpuState) -> cpu::Result<()> {
-        let state: VcpuMshvState = state.clone().into();
        self.set_msrs(&state.msrs)?;
        self.set_vcpu_events(&state.vcpu_events)?;
-        self.set_regs(&state.regs.into())?;
-        self.set_sregs(&state.sregs.into())?;
+        self.set_regs(&state.regs)?;
+        self.set_sregs(&state.sregs)?;
        self.set_fpu(&state.fpu)?;
        self.set_xcrs(&state.xcrs)?;
        self.set_lapic(&state.lapic)?;
@@ -657,19 +544,18 @@ impl cpu::Vcpu for MshvVcpu {
            .get_debug_regs()
            .map_err(|e| cpu::HypervisorCpuError::GetDebugRegs(e.into()))?;

-        Ok(VcpuMshvState {
+        Ok(CpuState {
            msrs,
            vcpu_events,
-            regs: regs.into(),
-            sregs: sregs.into(),
+            regs,
+            sregs,
            fpu,
            xcrs,
            lapic,
            dbg,
            xsave,
            misc,
-        }
-        .into())
+        })
    }
    #[cfg(target_arch = "x86_64")]
    ///
@@ -689,83 +575,42 @@ impl cpu::Vcpu for MshvVcpu {
    }
    #[cfg(target_arch = "x86_64")]
    ///
-    /// Return the list of initial MSR entries for a VCPU
+    /// X86 specific call that returns the vcpu's current "suspend registers".
    ///
-    fn boot_msr_entries(&self) -> Vec<MsrEntry> {
-        use crate::arch::x86::{msr_index, MTRR_ENABLE, MTRR_MEM_TYPE_WB};
-
-        [
-            msr!(msr_index::MSR_IA32_SYSENTER_CS),
-            msr!(msr_index::MSR_IA32_SYSENTER_ESP),
-            msr!(msr_index::MSR_IA32_SYSENTER_EIP),
-            msr!(msr_index::MSR_STAR),
-            msr!(msr_index::MSR_CSTAR),
-            msr!(msr_index::MSR_LSTAR),
-            msr!(msr_index::MSR_KERNEL_GS_BASE),
-            msr!(msr_index::MSR_SYSCALL_MASK),
-            msr!(msr_index::MSR_IA32_TSC),
-            msr_data!(msr_index::MSR_MTRRdefType, MTRR_ENABLE | MTRR_MEM_TYPE_WB),
-        ]
-        .to_vec()
+    fn get_suspend_regs(&self) -> cpu::Result<SuspendRegisters> {
+        self.fd
+            .get_suspend_regs()
+            .map_err(|e| cpu::HypervisorCpuError::GetSuspendRegs(e.into()))
    }
 }

-impl MshvVcpu {
-    #[cfg(target_arch = "x86_64")]
+/// Device struct for MSHV
+pub struct MshvDevice {
+    fd: DeviceFd,
+}
+
+impl device::Device for MshvDevice {
    ///
-    /// X86 specific call that returns the vcpu's current "xsave struct".
+    /// Set device attribute
    ///
-    fn get_xsave(&self) -> cpu::Result<Xsave> {
+    fn set_device_attr(&self, attr: &DeviceAttr) -> device::Result<()> {
        self.fd
-            .get_xsave()
-            .map_err(|e| cpu::HypervisorCpuError::GetXsaveState(e.into()))
+            .set_device_attr(attr)
+            .map_err(|e| device::HypervisorDeviceError::SetDeviceAttribute(e.into()))
    }
-    #[cfg(target_arch = "x86_64")]
    ///
-    /// X86 specific call that sets the vcpu's current "xsave struct".
+    /// Get device attribute
    ///
-    fn set_xsave(&self, xsave: &Xsave) -> cpu::Result<()> {
+    fn get_device_attr(&self, attr: &mut DeviceAttr) -> device::Result<()> {
        self.fd
-            .set_xsave(xsave)
-            .map_err(|e| cpu::HypervisorCpuError::SetXsaveState(e.into()))
+            .get_device_attr(attr)
+            .map_err(|e| device::HypervisorDeviceError::GetDeviceAttribute(e.into()))
    }
-    #[cfg(target_arch = "x86_64")]
-    ///
-    /// X86 specific call that returns the vcpu's current "xcrs".
-    ///
-    fn get_xcrs(&self) -> cpu::Result<ExtendedControlRegisters> {
-        self.fd
-            .get_xcrs()
-            .map_err(|e| cpu::HypervisorCpuError::GetXcsr(e.into()))
-    }
-    #[cfg(target_arch = "x86_64")]
-    ///
-    /// X86 specific call that sets the vcpu's current "xcrs".
-    ///
-    fn set_xcrs(&self, xcrs: &ExtendedControlRegisters) -> cpu::Result<()> {
-        self.fd
-            .set_xcrs(xcrs)
-            .map_err(|e| cpu::HypervisorCpuError::SetXcsr(e.into()))
-    }
-    #[cfg(target_arch = "x86_64")]
-    ///
-    /// Returns currently pending exceptions, interrupts, and NMIs as well as related
-    /// states of the vcpu.
-    ///
-    fn get_vcpu_events(&self) -> cpu::Result<VcpuEvents> {
-        self.fd
-            .get_vcpu_events()
-            .map_err(|e| cpu::HypervisorCpuError::GetVcpuEvents(e.into()))
-    }
-    #[cfg(target_arch = "x86_64")]
-    ///
-    /// Sets pending exceptions, interrupts, and NMIs as well as related states
-    /// of the vcpu.
-    ///
-    fn set_vcpu_events(&self, events: &VcpuEvents) -> cpu::Result<()> {
-        self.fd
-            .set_vcpu_events(events)
-            .map_err(|e| cpu::HypervisorCpuError::SetVcpuEvents(e.into()))
+}
+
+impl AsRawFd for MshvDevice {
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd.as_raw_fd()
    }
 }

@@ -810,9 +655,9 @@ impl<'a> PlatformEmulator for MshvEmulatorContext<'a> {
            gpa
        );

-        if let Some(vm_ops) = &self.vcpu.vm_ops {
-            if vm_ops.guest_mem_read(gpa, data).is_err() {
-                vm_ops
+        if let Some(vmmops) = &self.vcpu.vmmops {
+            if vmmops.guest_mem_read(gpa, data).is_err() {
+                vmmops
                    .mmio_read(gpa, data)
                    .map_err(|e| PlatformError::MemoryReadFailure(e.into()))?;
            }
@@ -830,9 +675,9 @@ impl<'a> PlatformEmulator for MshvEmulatorContext<'a> {
            gpa
        );

-        if let Some(vm_ops) = &self.vcpu.vm_ops {
-            if vm_ops.guest_mem_write(gpa, data).is_err() {
-                vm_ops
+        if let Some(vmmops) = &self.vcpu.vmmops {
+            if vmmops.guest_mem_write(gpa, data).is_err() {
+                vmmops
                    .mmio_write(gpa, data)
                    .map_err(|e| PlatformError::MemoryWriteFailure(e.into()))?;
            }
@@ -894,25 +739,19 @@ impl<'a> PlatformEmulator for MshvEmulatorContext<'a> {
    }
 }

+#[allow(dead_code)]
 /// Wrapper over Mshv VM ioctls.
 pub struct MshvVm {
    fd: Arc<VmFd>,
-    msrs: Vec<MsrEntry>,
+    msrs: MsrEntries,
+    // Hypervisor State
+    hv_state: Arc<RwLock<HvState>>,
+    vmmops: Option<Arc<dyn vm::VmmOps>>,
    dirty_log_slots: Arc<RwLock<HashMap<u64, MshvDirtyLogSlot>>>,
 }

-impl MshvVm {
-    ///
-    /// Creates an in-kernel device.
-    ///
-    /// See the documentation for `MSHV_CREATE_DEVICE`.
-    fn create_device(&self, device: &mut CreateDevice) -> vm::Result<VfioDeviceFd> {
-        let device_fd = self
-            .fd
-            .create_device(device)
-            .map_err(|e| vm::HypervisorVmError::CreateDevice(e.into()))?;
-        Ok(VfioDeviceFd::new_from_mshv(device_fd))
-    }
+fn hv_state_init() -> Arc<RwLock<HvState>> {
+    Arc::new(RwLock::new(HvState { hypercall_page: 0 }))
 }

 ///
@@ -977,7 +816,7 @@ impl vm::Vm for MshvVm {
    fn create_vcpu(
        &self,
        id: u8,
-        vm_ops: Option<Arc<dyn VmOps>>,
+        vmmops: Option<Arc<dyn VmmOps>>,
    ) -> vm::Result<Arc<dyn cpu::Vcpu>> {
        let vcpu_fd = self
            .fd
@@ -986,9 +825,10 @@ impl vm::Vm for MshvVm {
        let vcpu = MshvVcpu {
            fd: vcpu_fd,
            vp_index: id,
-            cpuid: Vec::new(),
+            cpuid: CpuId::new(1).unwrap(),
            msrs: self.msrs.clone(),
-            vm_ops,
+            hv_state: self.hv_state.clone(),
+            vmmops,
        };
        Ok(Arc::new(vcpu))
    }
@@ -1006,7 +846,6 @@ impl vm::Vm for MshvVm {
        addr: &IoEventAddress,
        datamatch: Option<DataMatch>,
    ) -> vm::Result<()> {
-        let addr = &mshv_ioctls::IoEventAddress::from(*addr);
        debug!(
            "register_ioevent fd {} addr {:x?} datamatch {:?}",
            fd.as_raw_fd(),
@@ -1032,7 +871,6 @@ impl vm::Vm for MshvVm {
    }
    /// Unregister an event from a certain address it has been previously registered to.
    fn unregister_ioevent(&self, fd: &EventFd, addr: &IoEventAddress) -> vm::Result<()> {
-        let addr = &mshv_ioctls::IoEventAddress::from(*addr);
        debug!("unregister_ioevent fd {} addr {:x?}", fd.as_raw_fd(), addr);

        self.fd
@@ -1041,8 +879,7 @@ impl vm::Vm for MshvVm {
    }

    /// Creates a guest physical memory region.
-    fn create_user_memory_region(&self, user_memory_region: UserMemoryRegion) -> vm::Result<()> {
-        let user_memory_region: mshv_user_mem_region = user_memory_region.into();
+    fn create_user_memory_region(&self, user_memory_region: MemoryRegion) -> vm::Result<()> {
        // No matter read only or not we keep track the slots.
        // For readonly hypervisor can enable the dirty bits,
        // but a VM exit happens before setting the dirty bits
@@ -1061,8 +898,7 @@ impl vm::Vm for MshvVm {
    }

    /// Removes a guest physical memory region.
-    fn remove_user_memory_region(&self, user_memory_region: UserMemoryRegion) -> vm::Result<()> {
-        let user_memory_region: mshv_user_mem_region = user_memory_region.into();
+    fn remove_user_memory_region(&self, user_memory_region: MemoryRegion) -> vm::Result<()> {
        // Remove the corresponding entry from "self.dirty_log_slots" if needed
        self.dirty_log_slots
            .write()
@@ -1083,7 +919,7 @@ impl vm::Vm for MshvVm {
        userspace_addr: u64,
        readonly: bool,
        _log_dirty_pages: bool,
-    ) -> UserMemoryRegion {
+    ) -> MemoryRegion {
        let mut flags = HV_MAP_GPA_READABLE | HV_MAP_GPA_EXECUTABLE;
        if !readonly {
            flags |= HV_MAP_GPA_WRITABLE;
@@ -1095,10 +931,22 @@ impl vm::Vm for MshvVm {
            size: memory_size,
            userspace_addr: userspace_addr as u64,
        }
-        .into()
    }

-    fn create_passthrough_device(&self) -> vm::Result<VfioDeviceFd> {
+    ///
+    /// Creates an in-kernel device.
+    ///
+    /// See the documentation for `MSHV_CREATE_DEVICE`.
+    fn create_device(&self, device: &mut CreateDevice) -> vm::Result<Arc<dyn device::Device>> {
+        let fd = self
+            .fd
+            .create_device(device)
+            .map_err(|e| vm::HypervisorVmError::CreateDevice(e.into()))?;
+        let device = MshvDevice { fd };
+        Ok(Arc::new(device))
+    }
+
+    fn create_passthrough_device(&self) -> vm::Result<Arc<dyn device::Device>> {
        let mut vfio_dev = mshv_create_device {
            type_: mshv_device_type_MSHV_DEV_TYPE_VFIO,
            fd: 0,
@@ -1109,45 +957,18 @@ impl vm::Vm for MshvVm {
            .map_err(|e| vm::HypervisorVmError::CreatePassthroughDevice(e.into()))
    }

-    ///
-    /// Constructs a routing entry
-    ///
-    fn make_routing_entry(&self, gsi: u32, config: &InterruptSourceConfig) -> IrqRoutingEntry {
-        match config {
-            InterruptSourceConfig::MsiIrq(cfg) => mshv_msi_routing_entry {
-                gsi,
-                address_lo: cfg.low_addr,
-                address_hi: cfg.high_addr,
-                data: cfg.data,
-            }
-            .into(),
-            _ => {
-                unreachable!()
-            }
-        }
-    }
-
    fn set_gsi_routing(&self, entries: &[IrqRoutingEntry]) -> vm::Result<()> {
        let mut msi_routing =
            vec_with_array_field::<mshv_msi_routing, mshv_msi_routing_entry>(entries.len());
        msi_routing[0].nr = entries.len() as u32;

-        let entries: Vec<mshv_msi_routing_entry> = entries
-            .iter()
-            .map(|entry| match entry {
-                IrqRoutingEntry::Mshv(e) => *e,
-                #[allow(unreachable_patterns)]
-                _ => panic!("IrqRoutingEntry type is wrong"),
-            })
-            .collect();
-
        // SAFETY: msi_routing initialized with entries.len() and now it is being turned into
        // entries_slice with entries.len() again. It is guaranteed to be large enough to hold
        // everything from entries.
        unsafe {
            let entries_slice: &mut [mshv_msi_routing_entry] =
                msi_routing[0].entries.as_mut_slice(entries.len());
-            entries_slice.copy_from_slice(&entries);
+            entries_slice.copy_from_slice(entries);
        }

        self.fd
@@ -1155,6 +976,19 @@ impl vm::Vm for MshvVm {
            .map_err(|e| vm::HypervisorVmError::SetGsiRouting(e.into()))
    }
    ///
+    /// Get the Vm state. Return VM specific data
+    ///
+    fn state(&self) -> vm::Result<VmState> {
+        Ok(*self.hv_state.read().unwrap())
+    }
+    ///
+    /// Set the VM state
+    ///
+    fn set_state(&self, state: VmState) -> vm::Result<()> {
+        self.hv_state.write().unwrap().hypercall_page = state.hypercall_page;
+        Ok(())
+    }
+    ///
    /// Start logging dirty pages
    ///
    fn start_dirty_log(&self) -> vm::Result<()> {
@@ -1192,18 +1026,7 @@ impl vm::Vm for MshvVm {
            )
            .map_err(|e| vm::HypervisorVmError::GetDirtyLog(e.into()))
    }
-    /// Retrieve guest clock.
-    #[cfg(target_arch = "x86_64")]
-    fn get_clock(&self) -> vm::Result<ClockData> {
-        Ok(ClockData::Mshv)
-    }
-    /// Set guest clock.
-    #[cfg(target_arch = "x86_64")]
-    fn set_clock(&self, _data: &ClockData) -> vm::Result<()> {
-        Ok(())
-    }
-    /// Downcast to the underlying MshvVm type
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
 }
+pub use hv_cpuid_entry as CpuIdEntry;
+
+pub const CPUID_FLAG_VALID_INDEX: u32 = 0;
--- a/hypervisor/src/mshv/x86_64/mod.rs
+++ b/hypervisor/src/mshv/x86_64/mod.rs
@@ -7,35 +7,30 @@
 // Copyright 2018-2019 CrowdStrike, Inc.
 //
 //
-use crate::arch::x86::{
-    CpuIdEntry, DescriptorTable, FpuState, LapicState, MsrEntry, SegmentRegister, SpecialRegisters,
-    StandardRegisters,
-};
-use serde::{Deserialize, Serialize};
+use crate::arch::x86::{msr_index, SegmentRegisterOps, MTRR_ENABLE, MTRR_MEM_TYPE_WB};
+use serde_derive::{Deserialize, Serialize};
 use std::fmt;

 ///
 /// Export generically-named wrappers of mshv_bindings for Unix-based platforms
 ///
 pub use {
-    mshv_bindings::hv_cpuid_entry, mshv_bindings::mshv_user_mem_region as MemoryRegion,
-    mshv_bindings::msr_entry, mshv_bindings::CpuId, mshv_bindings::DebugRegisters,
-    mshv_bindings::FloatingPointUnit, mshv_bindings::LapicState as MshvLapicState,
+    mshv_bindings::mshv_user_mem_region as MemoryRegion, mshv_bindings::msr_entry as MsrEntry,
+    mshv_bindings::CpuId, mshv_bindings::DebugRegisters,
+    mshv_bindings::FloatingPointUnit as FpuState, mshv_bindings::LapicState,
    mshv_bindings::MiscRegs as MiscRegisters, mshv_bindings::MsrList,
-    mshv_bindings::Msrs as MsrEntries, mshv_bindings::Msrs,
-    mshv_bindings::SegmentRegister as MshvSegmentRegister,
-    mshv_bindings::SpecialRegisters as MshvSpecialRegisters,
-    mshv_bindings::StandardRegisters as MshvStandardRegisters, mshv_bindings::SuspendRegisters,
-    mshv_bindings::TableRegister, mshv_bindings::VcpuEvents, mshv_bindings::XSave as Xsave,
+    mshv_bindings::Msrs as MsrEntries, mshv_bindings::Msrs, mshv_bindings::SegmentRegister,
+    mshv_bindings::SpecialRegisters, mshv_bindings::StandardRegisters,
+    mshv_bindings::SuspendRegisters, mshv_bindings::VcpuEvents, mshv_bindings::XSave as Xsave,
    mshv_bindings::Xcrs as ExtendedControlRegisters,
 };

 #[derive(Clone, Serialize, Deserialize)]
 pub struct VcpuMshvState {
-    pub msrs: Vec<MsrEntry>,
+    pub msrs: MsrEntries,
    pub vcpu_events: VcpuEvents,
-    pub regs: MshvStandardRegisters,
-    pub sregs: MshvSpecialRegisters,
+    pub regs: StandardRegisters,
+    pub sregs: SpecialRegisters,
    pub fpu: FpuState,
    pub xcrs: ExtendedControlRegisters,
    pub lapic: LapicState,
@@ -46,10 +41,10 @@ pub struct VcpuMshvState {

 impl fmt::Display for VcpuMshvState {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let expected_num_msrs = self.msrs.len();
+        let expected_num_msrs = self.msrs.as_fam_struct_ref().nmsrs as usize;
        let mut msr_entries = vec![vec![0; 2]; expected_num_msrs];

-        for (i, entry) in self.msrs.iter().enumerate() {
+        for (i, entry) in self.msrs.as_slice().iter().enumerate() {
            msr_entries[i][1] = entry.data;
            msr_entries[i][0] = entry.index as u64;
        }
@@ -68,252 +63,87 @@ impl fmt::Display for VcpuMshvState {
    }
 }

-impl From<StandardRegisters> for MshvStandardRegisters {
-    fn from(regs: StandardRegisters) -> Self {
-        Self {
-            rax: regs.rax,
-            rbx: regs.rbx,
-            rcx: regs.rcx,
-            rdx: regs.rdx,
-            rsi: regs.rsi,
-            rdi: regs.rdi,
-            rsp: regs.rsp,
-            rbp: regs.rbp,
-            r8: regs.r8,
-            r9: regs.r9,
-            r10: regs.r10,
-            r11: regs.r11,
-            r12: regs.r12,
-            r13: regs.r13,
-            r14: regs.r14,
-            r15: regs.r15,
-            rip: regs.rip,
-            rflags: regs.rflags,
-        }
+pub struct IrqRouting {}
+pub enum VcpuExit {}
+pub struct MpState {}
+
+impl SegmentRegisterOps for SegmentRegister {
+    fn segment_type(&self) -> u8 {
+        self.type_
+    }
+    fn set_segment_type(&mut self, val: u8) {
+        self.type_ = val;
+    }
+
+    fn dpl(&self) -> u8 {
+        self.dpl
+    }
+
+    fn set_dpl(&mut self, val: u8) {
+        self.dpl = val;
+    }
+
+    fn present(&self) -> u8 {
+        self.present
+    }
+
+    fn set_present(&mut self, val: u8) {
+        self.present = val;
+    }
+
+    fn long(&self) -> u8 {
+        self.l
+    }
+
+    fn set_long(&mut self, val: u8) {
+        self.l = val;
+    }
+
+    fn avl(&self) -> u8 {
+        self.avl
+    }
+
+    fn set_avl(&mut self, val: u8) {
+        self.avl = val;
+    }
+
+    fn desc_type(&self) -> u8 {
+        self.s
+    }
+
+    fn set_desc_type(&mut self, val: u8) {
+        self.s = val;
+    }
+
+    fn granularity(&self) -> u8 {
+        self.g
+    }
+
+    fn set_granularity(&mut self, val: u8) {
+        self.g = val;
+    }
+
+    fn db(&self) -> u8 {
+        self.db
+    }
+
+    fn set_db(&mut self, val: u8) {
+        self.db = val;
    }
 }

-impl From<MshvStandardRegisters> for StandardRegisters {
-    fn from(regs: MshvStandardRegisters) -> Self {
-        Self {
-            rax: regs.rax,
-            rbx: regs.rbx,
-            rcx: regs.rcx,
-            rdx: regs.rdx,
-            rsi: regs.rsi,
-            rdi: regs.rdi,
-            rsp: regs.rsp,
-            rbp: regs.rbp,
-            r8: regs.r8,
-            r9: regs.r9,
-            r10: regs.r10,
-            r11: regs.r11,
-            r12: regs.r12,
-            r13: regs.r13,
-            r14: regs.r14,
-            r15: regs.r15,
-            rip: regs.rip,
-            rflags: regs.rflags,
-        }
-    }
-}
-
-impl From<SegmentRegister> for MshvSegmentRegister {
-    fn from(s: SegmentRegister) -> Self {
-        Self {
-            base: s.base,
-            limit: s.limit,
-            selector: s.selector,
-            type_: s.type_,
-            present: s.present,
-            dpl: s.dpl,
-            db: s.db,
-            s: s.s,
-            l: s.l,
-            g: s.g,
-            avl: s.avl,
-            unusable: s.unusable,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<MshvSegmentRegister> for SegmentRegister {
-    fn from(s: MshvSegmentRegister) -> Self {
-        Self {
-            base: s.base,
-            limit: s.limit,
-            selector: s.selector,
-            type_: s.type_,
-            present: s.present,
-            dpl: s.dpl,
-            db: s.db,
-            s: s.s,
-            l: s.l,
-            g: s.g,
-            avl: s.avl,
-            unusable: s.unusable,
-        }
-    }
-}
-
-impl From<DescriptorTable> for TableRegister {
-    fn from(dt: DescriptorTable) -> Self {
-        Self {
-            base: dt.base,
-            limit: dt.limit,
-        }
-    }
-}
-
-impl From<TableRegister> for DescriptorTable {
-    fn from(dt: TableRegister) -> Self {
-        Self {
-            base: dt.base,
-            limit: dt.limit,
-        }
-    }
-}
-
-impl From<SpecialRegisters> for MshvSpecialRegisters {
-    fn from(s: SpecialRegisters) -> Self {
-        Self {
-            cs: s.cs.into(),
-            ds: s.ds.into(),
-            es: s.es.into(),
-            fs: s.fs.into(),
-            gs: s.gs.into(),
-            ss: s.ss.into(),
-            tr: s.tr.into(),
-            ldt: s.ldt.into(),
-            gdt: s.gdt.into(),
-            idt: s.idt.into(),
-            cr0: s.cr0,
-            cr2: s.cr2,
-            cr3: s.cr3,
-            cr4: s.cr4,
-            cr8: s.cr8,
-            efer: s.efer,
-            apic_base: s.apic_base,
-            interrupt_bitmap: s.interrupt_bitmap,
-        }
-    }
-}
-
-impl From<MshvSpecialRegisters> for SpecialRegisters {
-    fn from(s: MshvSpecialRegisters) -> Self {
-        Self {
-            cs: s.cs.into(),
-            ds: s.ds.into(),
-            es: s.es.into(),
-            fs: s.fs.into(),
-            gs: s.gs.into(),
-            ss: s.ss.into(),
-            tr: s.tr.into(),
-            ldt: s.ldt.into(),
-            gdt: s.gdt.into(),
-            idt: s.idt.into(),
-            cr0: s.cr0,
-            cr2: s.cr2,
-            cr3: s.cr3,
-            cr4: s.cr4,
-            cr8: s.cr8,
-            efer: s.efer,
-            apic_base: s.apic_base,
-            interrupt_bitmap: s.interrupt_bitmap,
-        }
-    }
-}
-
-impl From<CpuIdEntry> for hv_cpuid_entry {
-    fn from(e: CpuIdEntry) -> Self {
-        Self {
-            function: e.function,
-            index: e.index,
-            flags: e.flags,
-            eax: e.eax,
-            ebx: e.ebx,
-            ecx: e.ecx,
-            edx: e.edx,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<hv_cpuid_entry> for CpuIdEntry {
-    fn from(e: hv_cpuid_entry) -> Self {
-        Self {
-            function: e.function,
-            index: e.index,
-            flags: e.flags,
-            eax: e.eax,
-            ebx: e.ebx,
-            ecx: e.ecx,
-            edx: e.edx,
-        }
-    }
-}
-
-impl From<FloatingPointUnit> for FpuState {
-    fn from(s: FloatingPointUnit) -> Self {
-        Self {
-            fpr: s.fpr,
-            fcw: s.fcw,
-            fsw: s.fsw,
-            ftwx: s.ftwx,
-            last_opcode: s.last_opcode,
-            last_ip: s.last_ip,
-            last_dp: s.last_dp,
-            xmm: s.xmm,
-            mxcsr: s.mxcsr,
-        }
-    }
-}
-
-impl From<FpuState> for FloatingPointUnit {
-    fn from(s: FpuState) -> Self {
-        Self {
-            fpr: s.fpr,
-            fcw: s.fcw,
-            fsw: s.fsw,
-            ftwx: s.ftwx,
-            last_opcode: s.last_opcode,
-            last_ip: s.last_ip,
-            last_dp: s.last_dp,
-            xmm: s.xmm,
-            mxcsr: s.mxcsr,
-            ..Default::default()
-        }
-    }
-}
-
-impl From<LapicState> for MshvLapicState {
-    fn from(s: LapicState) -> Self {
-        Self { regs: s.regs }
-    }
-}
-
-impl From<MshvLapicState> for LapicState {
-    fn from(s: MshvLapicState) -> Self {
-        Self { regs: s.regs }
-    }
-}
-
-impl From<msr_entry> for MsrEntry {
-    fn from(e: msr_entry) -> Self {
-        Self {
-            index: e.index,
-            data: e.data,
-        }
-    }
-}
-
-impl From<MsrEntry> for msr_entry {
-    fn from(e: MsrEntry) -> Self {
-        Self {
-            index: e.index,
-            data: e.data,
-            ..Default::default()
-        }
-    }
+pub fn boot_msr_entries() -> MsrEntries {
+    MsrEntries::from_entries(&[
+        msr!(msr_index::MSR_IA32_SYSENTER_CS),
+        msr!(msr_index::MSR_IA32_SYSENTER_ESP),
+        msr!(msr_index::MSR_IA32_SYSENTER_EIP),
+        msr!(msr_index::MSR_STAR),
+        msr!(msr_index::MSR_CSTAR),
+        msr!(msr_index::MSR_LSTAR),
+        msr!(msr_index::MSR_KERNEL_GS_BASE),
+        msr!(msr_index::MSR_SYSCALL_MASK),
+        msr!(msr_index::MSR_IA32_TSC),
+        msr_data!(msr_index::MSR_MTRRdefType, MTRR_ENABLE | MTRR_MEM_TYPE_WB),
+    ])
+    .unwrap()
 }
--- a/hypervisor/src/vm.rs
+++ b/hypervisor/src/vm.rs
@@ -10,21 +10,23 @@

 #[cfg(target_arch = "aarch64")]
 use crate::aarch64::VcpuInit;
-#[cfg(target_arch = "aarch64")]
-use crate::arch::aarch64::gic::Vgic;
-#[cfg(feature = "tdx")]
-use crate::arch::x86::CpuIdEntry;
 use crate::cpu::Vcpu;
-#[cfg(target_arch = "x86_64")]
+use crate::device::Device;
+#[cfg(feature = "tdx")]
+use crate::x86_64::CpuId;
+#[cfg(all(feature = "kvm", target_arch = "x86_64"))]
 use crate::ClockData;
-use crate::UserMemoryRegion;
-use crate::{IoEventAddress, IrqRoutingEntry};
-use std::any::Any;
+use crate::CreateDevice;
+#[cfg(feature = "mshv")]
+use crate::HvState as VmState;
+#[cfg(feature = "kvm")]
+use crate::KvmVmState as VmState;
+use crate::{IoEventAddress, IrqRoutingEntry, MemoryRegion};
+#[cfg(feature = "kvm")]
+use kvm_ioctls::Cap;
 #[cfg(target_arch = "x86_64")]
 use std::fs::File;
 use std::sync::Arc;
-#[cfg(target_arch = "aarch64")]
-use std::sync::Mutex;
 use thiserror::Error;
 use vmm_sys_util::eventfd::EventFd;

@@ -208,56 +210,18 @@ pub enum HypervisorVmError {
    ///
    #[error("Failed to initialize memory region TDX: {0}")]
    InitMemRegionTdx(#[source] std::io::Error),
-    ///
-    /// Create Vgic error
-    ///
-    #[error("Failed to create Vgic: {0}")]
-    CreateVgic(#[source] anyhow::Error),
 }
 ///
 /// Result type for returning from a function
 ///
 pub type Result<T> = std::result::Result<T, HypervisorVmError>;

-/// Configuration data for legacy interrupts.
-///
-/// On x86 platforms, legacy interrupts means those interrupts routed through PICs or IOAPICs.
-#[derive(Copy, Clone, Debug)]
-pub struct LegacyIrqSourceConfig {
-    pub irqchip: u32,
-    pub pin: u32,
-}
-
-/// Configuration data for MSI/MSI-X interrupts.
-///
-/// On x86 platforms, these interrupts are vectors delivered directly to the LAPIC.
-#[derive(Copy, Clone, Debug, Default)]
-pub struct MsiIrqSourceConfig {
-    /// High address to delivery message signaled interrupt.
-    pub high_addr: u32,
-    /// Low address to delivery message signaled interrupt.
-    pub low_addr: u32,
-    /// Data to write to delivery message signaled interrupt.
-    pub data: u32,
-    /// Unique ID of the device to delivery message signaled interrupt.
-    pub devid: u32,
-}
-
-/// Configuration data for an interrupt source.
-#[derive(Copy, Clone, Debug)]
-pub enum InterruptSourceConfig {
-    /// Configuration data for Legacy interrupts.
-    LegacyIrq(LegacyIrqSourceConfig),
-    /// Configuration data for PciMsi, PciMsix and generic MSI interrupts.
-    MsiIrq(MsiIrqSourceConfig),
-}
-
 ///
 /// Trait to represent a Vm
 ///
 /// This crate provides a hypervisor-agnostic interfaces for Vm
 ///
-pub trait Vm: Send + Sync + Any {
+pub trait Vm: Send + Sync {
    #[cfg(target_arch = "x86_64")]
    /// Sets the address of the one-page region in the VM's address space.
    fn set_identity_map_address(&self, address: u64) -> Result<()>;
@@ -271,18 +235,7 @@ pub trait Vm: Send + Sync + Any {
    /// Unregister an event that will, when signaled, trigger the `gsi` IRQ.
    fn unregister_irqfd(&self, fd: &EventFd, gsi: u32) -> Result<()>;
    /// Creates a new KVM vCPU file descriptor and maps the memory corresponding
-    fn create_vcpu(&self, id: u8, vm_ops: Option<Arc<dyn VmOps>>) -> Result<Arc<dyn Vcpu>>;
-    #[cfg(target_arch = "aarch64")]
-    fn create_vgic(
-        &self,
-        vcpu_count: u64,
-        dist_addr: u64,
-        dist_size: u64,
-        redist_size: u64,
-        msi_size: u64,
-        nr_irqs: u32,
-    ) -> Result<Arc<Mutex<dyn Vgic>>>;
-
+    fn create_vcpu(&self, id: u8, vmmops: Option<Arc<dyn VmmOps>>) -> Result<Arc<dyn Vcpu>>;
    /// Registers an event to be signaled whenever a certain address is written to.
    fn register_ioevent(
        &self,
@@ -292,8 +245,6 @@ pub trait Vm: Send + Sync + Any {
    ) -> Result<()>;
    /// Unregister an event from a certain address it has been previously registered to.
    fn unregister_ioevent(&self, fd: &EventFd, addr: &IoEventAddress) -> Result<()>;
-    // Construct a routing entry
-    fn make_routing_entry(&self, gsi: u32, config: &InterruptSourceConfig) -> IrqRoutingEntry;
    /// Sets the GSI routing table entries, overwriting any previously set
    fn set_gsi_routing(&self, entries: &[IrqRoutingEntry]) -> Result<()>;
    /// Creates a memory region structure that can be used with {create/remove}_user_memory_region
@@ -305,13 +256,15 @@ pub trait Vm: Send + Sync + Any {
        userspace_addr: u64,
        readonly: bool,
        log_dirty_pages: bool,
-    ) -> UserMemoryRegion;
+    ) -> MemoryRegion;
    /// Creates a guest physical memory slot.
-    fn create_user_memory_region(&self, user_memory_region: UserMemoryRegion) -> Result<()>;
+    fn create_user_memory_region(&self, user_memory_region: MemoryRegion) -> Result<()>;
    /// Removes a guest physical memory slot.
-    fn remove_user_memory_region(&self, user_memory_region: UserMemoryRegion) -> Result<()>;
+    fn remove_user_memory_region(&self, user_memory_region: MemoryRegion) -> Result<()>;
+    /// Creates an emulated device in the kernel.
+    fn create_device(&self, device: &mut CreateDevice) -> Result<Arc<dyn Device>>;
    /// Returns the preferred CPU target type which can be emulated by KVM on underlying host.
-    #[cfg(target_arch = "aarch64")]
+    #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
    fn get_preferred_target(&self, kvi: &mut VcpuInit) -> Result<()>;
    /// Enable split Irq capability
    #[cfg(target_arch = "x86_64")]
@@ -319,13 +272,20 @@ pub trait Vm: Send + Sync + Any {
    #[cfg(target_arch = "x86_64")]
    fn enable_sgx_attribute(&self, file: File) -> Result<()>;
    /// Retrieve guest clock.
-    #[cfg(target_arch = "x86_64")]
+    #[cfg(all(feature = "kvm", target_arch = "x86_64"))]
    fn get_clock(&self) -> Result<ClockData>;
    /// Set guest clock.
-    #[cfg(target_arch = "x86_64")]
+    #[cfg(all(feature = "kvm", target_arch = "x86_64"))]
    fn set_clock(&self, data: &ClockData) -> Result<()>;
+    #[cfg(feature = "kvm")]
+    /// Checks if a particular `Cap` is available.
+    fn check_extension(&self, c: Cap) -> bool;
    /// Create a device that is used for passthrough
-    fn create_passthrough_device(&self) -> Result<vfio_ioctls::VfioDeviceFd>;
+    fn create_passthrough_device(&self) -> Result<Arc<dyn Device>>;
+    /// Get the Vm state. Return VM specific data
+    fn state(&self) -> Result<VmState>;
+    /// Set the VM state
+    fn set_state(&self, state: VmState) -> Result<()>;
    /// Start logging dirty pages
    fn start_dirty_log(&self) -> Result<()>;
    /// Stop logging dirty pages
@@ -334,7 +294,7 @@ pub trait Vm: Send + Sync + Any {
    fn get_dirty_log(&self, slot: u32, base_gpa: u64, memory_size: u64) -> Result<Vec<u64>>;
    #[cfg(feature = "tdx")]
    /// Initalize TDX on this VM
-    fn tdx_init(&self, cpuid: &[CpuIdEntry], max_vcpus: u32) -> Result<()>;
+    fn tdx_init(&self, cpuid: &CpuId, max_vcpus: u32) -> Result<()>;
    #[cfg(feature = "tdx")]
    /// Finalize the configuration of TDX on this VM
    fn tdx_finalize(&self) -> Result<()>;
@@ -347,11 +307,9 @@ pub trait Vm: Send + Sync + Any {
        size: u64,
        measure: bool,
    ) -> Result<()>;
-    /// Downcast to the underlying hypervisor VM type
-    fn as_any(&self) -> &dyn Any;
 }

-pub trait VmOps: Send + Sync {
+pub trait VmmOps: Send + Sync {
    fn guest_mem_write(&self, gpa: u64, buf: &[u8]) -> Result<usize>;
    fn guest_mem_read(&self, gpa: u64, buf: &mut [u8]) -> Result<usize>;
    fn mmio_read(&self, gpa: u64, data: &mut [u8]) -> Result<()>;
--- a/net_gen/Cargo.toml
+++ b/net_gen/Cargo.toml
@@ -5,4 +5,4 @@ authors = ["The Chromium OS Authors"]
 edition = "2021"

 [dependencies]
-vmm-sys-util = "0.10.0"
+vmm-sys-util = "0.9.0"
--- a/net_util/Cargo.toml
+++ b/net_util/Cargo.toml
@@ -6,23 +6,21 @@ edition = "2021"

 [dependencies]
 epoll = "4.3.1"
-getrandom = "0.2.7"
-libc = "0.2.131"
-log = "0.4.17"
+getrandom = "0.2"
+libc = "0.2.123"
+log = "0.4.16"
 net_gen = { path = "../net_gen" }
 rate_limiter = { path = "../rate_limiter" }
-serde = "1.0.143"
-thiserror = "1.0.32"
+serde = "1.0.136"
 versionize = "0.1.6"
 versionize_derive = "0.1.4"
 virtio-bindings = "0.1.0"
-virtio-queue = "0.5.0"
-vm-memory = { version = "0.8.0", features = ["backend-mmap", "backend-atomic", "backend-bitmap"] }
+virtio-queue = "0.2.0"
+vm-memory = { version = "0.7.0", features = ["backend-mmap", "backend-atomic", "backend-bitmap"] }
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.10.0"
+vmm-sys-util = "0.9.0"

 [dev-dependencies]
-once_cell = "1.13.1"
-pnet = "0.31.0"
-pnet_datalink = "0.31.0"
-serde_json = "1.0.83"
+lazy_static = "1.4.0"
+pnet = "0.29.0"
+serde_json = "1.0.79"
--- a/net_util/src/ctrl_queue.rs
+++ b/net_util/src/ctrl_queue.rs
@@ -13,8 +13,8 @@ use virtio_bindings::bindings::virtio_net::{
    VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
    VIRTIO_NET_F_GUEST_UFO, VIRTIO_NET_OK,
 };
-use virtio_queue::{Queue, QueueT};
-use vm_memory::{ByteValued, Bytes, GuestMemoryError};
+use virtio_queue::Queue;
+use vm_memory::{ByteValued, Bytes, GuestMemoryAtomic, GuestMemoryError};
 use vm_virtio::{AccessPlatform, Translatable};

 #[derive(Debug)]
@@ -58,93 +58,98 @@ impl CtrlQueue {

    pub fn process(
        &mut self,
-        mem: &GuestMemoryMmap,
-        queue: &mut Queue,
+        queue: &mut Queue<GuestMemoryAtomic<GuestMemoryMmap>>,
        access_platform: Option<&Arc<dyn AccessPlatform>>,
    ) -> Result<()> {
-        while let Some(mut desc_chain) = queue.pop_descriptor_chain(mem) {
-            let ctrl_desc = desc_chain.next().ok_or(Error::NoControlHeaderDescriptor)?;
+        let mut used_desc_heads = Vec::new();
+        loop {
+            for mut desc_chain in queue.iter().map_err(Error::QueueIterator)? {
+                let ctrl_desc = desc_chain.next().ok_or(Error::NoControlHeaderDescriptor)?;

-            let ctrl_hdr: ControlHeader = desc_chain
-                .memory()
-                .read_obj(
-                    ctrl_desc
-                        .addr()
-                        .translate_gva(access_platform, ctrl_desc.len() as usize),
-                )
-                .map_err(Error::GuestMemory)?;
-            let data_desc = desc_chain.next().ok_or(Error::NoDataDescriptor)?;
+                let ctrl_hdr: ControlHeader = desc_chain
+                    .memory()
+                    .read_obj(
+                        ctrl_desc
+                            .addr()
+                            .translate_gva(access_platform, ctrl_desc.len() as usize),
+                    )
+                    .map_err(Error::GuestMemory)?;
+                let data_desc = desc_chain.next().ok_or(Error::NoDataDescriptor)?;

-            let data_desc_addr = data_desc
-                .addr()
-                .translate_gva(access_platform, data_desc.len() as usize);
+                let data_desc_addr = data_desc
+                    .addr()
+                    .translate_gva(access_platform, data_desc.len() as usize);

-            let status_desc = desc_chain.next().ok_or(Error::NoStatusDescriptor)?;
+                let status_desc = desc_chain.next().ok_or(Error::NoStatusDescriptor)?;

-            let ok = match u32::from(ctrl_hdr.class) {
-                VIRTIO_NET_CTRL_MQ => {
-                    let queue_pairs = desc_chain
-                        .memory()
-                        .read_obj::<u16>(data_desc_addr)
-                        .map_err(Error::GuestMemory)?;
-                    if u32::from(ctrl_hdr.cmd) != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET {
-                        warn!("Unsupported command: {}", ctrl_hdr.cmd);
-                        false
-                    } else if (queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN as u16)
-                        || (queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX as u16)
-                    {
-                        warn!("Number of MQ pairs out of range: {}", queue_pairs);
-                        false
-                    } else {
-                        info!("Number of MQ pairs requested: {}", queue_pairs);
-                        true
-                    }
-                }
-                VIRTIO_NET_CTRL_GUEST_OFFLOADS => {
-                    let features = desc_chain
-                        .memory()
-                        .read_obj::<u64>(data_desc_addr)
-                        .map_err(Error::GuestMemory)?;
-                    if u32::from(ctrl_hdr.cmd) != VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET {
-                        warn!("Unsupported command: {}", ctrl_hdr.cmd);
-                        false
-                    } else {
-                        let mut ok = true;
-                        for tap in self.taps.iter_mut() {
-                            info!("Reprogramming tap offload with features: {}", features);
-                            tap.set_offload(virtio_features_to_tap_offload(features))
-                                .map_err(|e| {
-                                    error!("Error programming tap offload: {:?}", e);
-                                    ok = false
-                                })
-                                .ok();
+                let ok = match u32::from(ctrl_hdr.class) {
+                    VIRTIO_NET_CTRL_MQ => {
+                        let queue_pairs = desc_chain
+                            .memory()
+                            .read_obj::<u16>(data_desc_addr)
+                            .map_err(Error::GuestMemory)?;
+                        if u32::from(ctrl_hdr.cmd) != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET {
+                            warn!("Unsupported command: {}", ctrl_hdr.cmd);
+                            false
+                        } else if (queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN as u16)
+                            || (queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX as u16)
+                        {
+                            warn!("Number of MQ pairs out of range: {}", queue_pairs);
+                            false
+                        } else {
+                            info!("Number of MQ pairs requested: {}", queue_pairs);
+                            true
                        }
-                        ok
                    }
-                }
-                _ => {
-                    warn!("Unsupported command {:?}", ctrl_hdr);
-                    false
-                }
-            };
+                    VIRTIO_NET_CTRL_GUEST_OFFLOADS => {
+                        let features = desc_chain
+                            .memory()
+                            .read_obj::<u64>(data_desc_addr)
+                            .map_err(Error::GuestMemory)?;
+                        if u32::from(ctrl_hdr.cmd) != VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET {
+                            warn!("Unsupported command: {}", ctrl_hdr.cmd);
+                            false
+                        } else {
+                            let mut ok = true;
+                            for tap in self.taps.iter_mut() {
+                                info!("Reprogramming tap offload with features: {}", features);
+                                tap.set_offload(virtio_features_to_tap_offload(features))
+                                    .map_err(|e| {
+                                        error!("Error programming tap offload: {:?}", e);
+                                        ok = false
+                                    })
+                                    .ok();
+                            }
+                            ok
+                        }
+                    }
+                    _ => {
+                        warn!("Unsupported command {:?}", ctrl_hdr);
+                        false
+                    }
+                };

-            desc_chain
-                .memory()
-                .write_obj(
-                    if ok { VIRTIO_NET_OK } else { VIRTIO_NET_ERR } as u8,
-                    status_desc
-                        .addr()
-                        .translate_gva(access_platform, status_desc.len() as usize),
-                )
-                .map_err(Error::GuestMemory)?;
-            let len = ctrl_desc.len() + data_desc.len() + status_desc.len();
+                desc_chain
+                    .memory()
+                    .write_obj(
+                        if ok { VIRTIO_NET_OK } else { VIRTIO_NET_ERR } as u8,
+                        status_desc
+                            .addr()
+                            .translate_gva(access_platform, status_desc.len() as usize),
+                    )
+                    .map_err(Error::GuestMemory)?;
+                let len = ctrl_desc.len() + data_desc.len() + status_desc.len();
+                used_desc_heads.push((desc_chain.head_index(), len));
+            }

-            queue
-                .add_used(desc_chain.memory(), desc_chain.head_index(), len)
-                .map_err(Error::QueueAddUsed)?;
+            for (desc_index, len) in used_desc_heads.iter() {
+                queue
+                    .add_used(*desc_index, *len)
+                    .map_err(Error::QueueAddUsed)?;
+            }

            if !queue
-                .enable_notification(mem)
+                .enable_notification()
                .map_err(Error::QueueEnableNotification)?
            {
                break;
--- a/net_util/src/lib.rs
+++ b/net_util/src/lib.rs
@@ -5,6 +5,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the THIRD-PARTY file.

+// This is only used by the tests module from tap.rs, but we cannot use #[macro_use] unless the
+// reference to lazy_static is declared at the root level of the importing crate.
+#[cfg(test)]
+#[macro_use]
+extern crate lazy_static;
 #[macro_use]
 extern crate log;

@@ -18,7 +23,6 @@ use std::io::Error as IoError;
 use std::os::raw::c_uint;
 use std::os::unix::io::{FromRawFd, RawFd};
 use std::{io, mem, net};
-use thiserror::Error;
 use versionize::{VersionMap, Versionize, VersionizeResult};
 use versionize_derive::Versionize;
 use virtio_bindings::bindings::virtio_net::{
@@ -36,9 +40,9 @@ pub use open_tap::{open_tap, Error as OpenTapError};
 pub use queue_pair::{NetCounters, NetQueuePair, NetQueuePairError, RxVirtio, TxVirtio};
 pub use tap::{Error as TapError, Tap};

-#[derive(Error, Debug)]
+#[derive(Debug)]
 pub enum Error {
-    #[error("Failed to create a socket: {0}")]
+    /// Failed to create a socket.
    CreateSocket(IoError),
 }

--- a/net_util/src/mac.rs
+++ b/net_util/src/mac.rs
@@ -15,7 +15,7 @@ use serde::ser::{Serialize, Serializer};

 pub const MAC_ADDR_LEN: usize = 6;

-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub struct MacAddr {
    bytes: [u8; MAC_ADDR_LEN],
 }
--- a/net_util/src/open_tap.rs
+++ b/net_util/src/open_tap.rs
@@ -6,31 +6,30 @@ use super::{vnet_hdr_len, MacAddr, Tap, TapError};
 use std::net::Ipv4Addr;
 use std::path::Path;
 use std::{fs, io};
-use thiserror::Error;

-#[derive(Error, Debug)]
+#[derive(Debug)]
 pub enum Error {
-    #[error("Failed to convert an hexadecimal string into an integer: {0}")]
+    /// Failed to convert an hexadecimal string into an integer.
    ConvertHexStringToInt(std::num::ParseIntError),
-    #[error("Error related to the multiqueue support (no support TAP side).")]
+    /// Error related to the multiqueue support (no support TAP side).
    MultiQueueNoTapSupport,
-    #[error("Error related to the multiqueue support (no support device side).")]
+    /// Error related to the multiqueue support (no support device side).
    MultiQueueNoDeviceSupport,
-    #[error("Failed to read the TAP flags from sysfs: {0}")]
+    /// Failed to read the TAP flags from sysfs.
    ReadSysfsTunFlags(io::Error),
-    #[error("Open tap device failed: {0}")]
+    /// Open tap device failed.
    TapOpen(TapError),
-    #[error("Setting tap IP failed: {0}")]
+    /// Setting tap IP failed.
    TapSetIp(TapError),
-    #[error("Setting tap netmask failed: {0}")]
+    /// Setting tap netmask failed.
    TapSetNetmask(TapError),
-    #[error("Setting MAC address failed: {0}")]
+    /// Setting MAC address failed
    TapSetMac(TapError),
-    #[error("Getting MAC address failed: {0}")]
+    /// Getting MAC address failed
    TapGetMac(TapError),
-    #[error("Setting vnet header size failed: {0}")]
+    /// Setting vnet header size failed.
    TapSetVnetHdrSize(TapError),
-    #[error("Enabling tap interface failed: {0}")]
+    /// Enabling tap interface failed.
    TapEnable(TapError),
 }

--- a/net_util/src/queue_pair.rs
+++ b/net_util/src/queue_pair.rs
@@ -10,9 +10,8 @@ use std::num::Wrapping;
 use std::os::unix::io::{AsRawFd, RawFd};
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::Arc;
-use thiserror::Error;
-use virtio_queue::{Queue, QueueOwnedT, QueueT};
-use vm_memory::{Bytes, GuestMemory};
+use virtio_queue::Queue;
+use vm_memory::{Bytes, GuestMemory, GuestMemoryAtomic};
 use vm_virtio::{AccessPlatform, Translatable};

 #[derive(Clone)]
@@ -37,95 +36,104 @@ impl TxVirtio {

    pub fn process_desc_chain(
        &mut self,
-        mem: &GuestMemoryMmap,
        tap: &mut Tap,
-        queue: &mut Queue,
+        queue: &mut Queue<GuestMemoryAtomic<GuestMemoryMmap>>,
        rate_limiter: &mut Option<RateLimiter>,
        access_platform: Option<&Arc<dyn AccessPlatform>>,
    ) -> Result<bool, NetQueuePairError> {
        let mut retry_write = false;
        let mut rate_limit_reached = false;

-        while let Some(mut desc_chain) = queue.pop_descriptor_chain(mem) {
-            if rate_limit_reached {
-                queue.go_to_previous_position();
+        loop {
+            let used_desc_head: (u16, u32);
+            let mut avail_iter = queue
+                .iter()
+                .map_err(NetQueuePairError::QueueIteratorFailed)?;
+
+            if let Some(mut desc_chain) = avail_iter.next() {
+                if rate_limit_reached {
+                    avail_iter.go_to_previous_position();
+                    break;
+                }
+
+                let mut next_desc = desc_chain.next();
+
+                let mut iovecs = Vec::new();
+                while let Some(desc) = next_desc {
+                    let desc_addr = desc
+                        .addr()
+                        .translate_gva(access_platform, desc.len() as usize);
+                    if !desc.is_write_only() && desc.len() > 0 {
+                        let buf = desc_chain
+                            .memory()
+                            .get_slice(desc_addr, desc.len() as usize)
+                            .map_err(NetQueuePairError::GuestMemory)?
+                            .as_ptr();
+                        let iovec = libc::iovec {
+                            iov_base: buf as *mut libc::c_void,
+                            iov_len: desc.len() as libc::size_t,
+                        };
+                        iovecs.push(iovec);
+                    } else {
+                        error!(
+                            "Invalid descriptor chain: address = 0x{:x} length = {} write_only = {}",
+                            desc_addr.0,
+                            desc.len(),
+                            desc.is_write_only()
+                        );
+                        return Err(NetQueuePairError::DescriptorChainInvalid);
+                    }
+                    next_desc = desc_chain.next();
+                }
+
+                let len = if !iovecs.is_empty() {
+                    let result = unsafe {
+                        libc::writev(
+                            tap.as_raw_fd() as libc::c_int,
+                            iovecs.as_ptr() as *const libc::iovec,
+                            iovecs.len() as libc::c_int,
+                        )
+                    };
+
+                    if result < 0 {
+                        let e = std::io::Error::last_os_error();
+
+                        /* EAGAIN */
+                        if e.kind() == std::io::ErrorKind::WouldBlock {
+                            avail_iter.go_to_previous_position();
+                            retry_write = true;
+                            break;
+                        }
+                        error!("net: tx: failed writing to tap: {}", e);
+                        return Err(NetQueuePairError::WriteTap(e));
+                    }
+
+                    self.counter_bytes += Wrapping(result as u64 - vnet_hdr_len() as u64);
+                    self.counter_frames += Wrapping(1);
+
+                    result as u32
+                } else {
+                    0
+                };
+
+                used_desc_head = (desc_chain.head_index(), len);
+
+                // For the sake of simplicity (similar to the RX rate limiting), we always
+                // let the 'last' descriptor chain go-through even if it was over the rate
+                // limit, and simply stop processing oncoming `avail_desc` if any.
+                if let Some(rate_limiter) = rate_limiter {
+                    rate_limit_reached = !rate_limiter.consume(1, TokenType::Ops)
+                        || !rate_limiter.consume(len as u64, TokenType::Bytes);
+                }
+            } else {
                break;
            }

-            let mut next_desc = desc_chain.next();
-
-            let mut iovecs = Vec::new();
-            while let Some(desc) = next_desc {
-                let desc_addr = desc
-                    .addr()
-                    .translate_gva(access_platform, desc.len() as usize);
-                if !desc.is_write_only() && desc.len() > 0 {
-                    let buf = desc_chain
-                        .memory()
-                        .get_slice(desc_addr, desc.len() as usize)
-                        .map_err(NetQueuePairError::GuestMemory)?
-                        .as_ptr();
-                    let iovec = libc::iovec {
-                        iov_base: buf as *mut libc::c_void,
-                        iov_len: desc.len() as libc::size_t,
-                    };
-                    iovecs.push(iovec);
-                } else {
-                    error!(
-                        "Invalid descriptor chain: address = 0x{:x} length = {} write_only = {}",
-                        desc_addr.0,
-                        desc.len(),
-                        desc.is_write_only()
-                    );
-                    return Err(NetQueuePairError::DescriptorChainInvalid);
-                }
-                next_desc = desc_chain.next();
-            }
-
-            let len = if !iovecs.is_empty() {
-                let result = unsafe {
-                    libc::writev(
-                        tap.as_raw_fd() as libc::c_int,
-                        iovecs.as_ptr() as *const libc::iovec,
-                        iovecs.len() as libc::c_int,
-                    )
-                };
-
-                if result < 0 {
-                    let e = std::io::Error::last_os_error();
-
-                    /* EAGAIN */
-                    if e.kind() == std::io::ErrorKind::WouldBlock {
-                        queue.go_to_previous_position();
-                        retry_write = true;
-                        break;
-                    }
-                    error!("net: tx: failed writing to tap: {}", e);
-                    return Err(NetQueuePairError::WriteTap(e));
-                }
-
-                self.counter_bytes += Wrapping(result as u64 - vnet_hdr_len() as u64);
-                self.counter_frames += Wrapping(1);
-
-                result as u32
-            } else {
-                0
-            };
-
-            // For the sake of simplicity (similar to the RX rate limiting), we always
-            // let the 'last' descriptor chain go-through even if it was over the rate
-            // limit, and simply stop processing oncoming `avail_desc` if any.
-            if let Some(rate_limiter) = rate_limiter {
-                rate_limit_reached = !rate_limiter.consume(1, TokenType::Ops)
-                    || !rate_limiter.consume(len as u64, TokenType::Bytes);
-            }
-
            queue
-                .add_used(desc_chain.memory(), desc_chain.head_index(), len)
+                .add_used(used_desc_head.0, used_desc_head.1)
                .map_err(NetQueuePairError::QueueAddUsed)?;
-
            if !queue
-                .enable_notification(mem)
+                .enable_notification()
                .map_err(NetQueuePairError::QueueEnableNotification)?
            {
                break;
@@ -158,116 +166,125 @@ impl RxVirtio {

    pub fn process_desc_chain(
        &mut self,
-        mem: &GuestMemoryMmap,
        tap: &mut Tap,
-        queue: &mut Queue,
+        queue: &mut Queue<GuestMemoryAtomic<GuestMemoryMmap>>,
        rate_limiter: &mut Option<RateLimiter>,
        access_platform: Option<&Arc<dyn AccessPlatform>>,
    ) -> Result<bool, NetQueuePairError> {
        let mut exhausted_descs = true;
        let mut rate_limit_reached = false;

-        while let Some(mut desc_chain) = queue.pop_descriptor_chain(mem) {
-            if rate_limit_reached {
-                exhausted_descs = false;
-                queue.go_to_previous_position();
+        loop {
+            let used_desc_head: (u16, u32);
+            let mut avail_iter = queue
+                .iter()
+                .map_err(NetQueuePairError::QueueIteratorFailed)?;
+
+            if let Some(mut desc_chain) = avail_iter.next() {
+                if rate_limit_reached {
+                    exhausted_descs = false;
+                    avail_iter.go_to_previous_position();
+                    break;
+                }
+
+                let desc = desc_chain
+                    .next()
+                    .ok_or(NetQueuePairError::DescriptorChainTooShort)?;
+
+                let num_buffers_addr = desc_chain
+                    .memory()
+                    .checked_offset(
+                        desc.addr()
+                            .translate_gva(access_platform, desc.len() as usize),
+                        10,
+                    )
+                    .unwrap();
+                let mut next_desc = Some(desc);
+
+                let mut iovecs = Vec::new();
+                while let Some(desc) = next_desc {
+                    let desc_addr = desc
+                        .addr()
+                        .translate_gva(access_platform, desc.len() as usize);
+                    if desc.is_write_only() && desc.len() > 0 {
+                        let buf = desc_chain
+                            .memory()
+                            .get_slice(desc_addr, desc.len() as usize)
+                            .map_err(NetQueuePairError::GuestMemory)?
+                            .as_ptr();
+                        let iovec = libc::iovec {
+                            iov_base: buf as *mut libc::c_void,
+                            iov_len: desc.len() as libc::size_t,
+                        };
+                        iovecs.push(iovec);
+                    } else {
+                        error!(
+                            "Invalid descriptor chain: address = 0x{:x} length = {} write_only = {}",
+                            desc_addr.0,
+                            desc.len(),
+                            desc.is_write_only()
+                        );
+                        return Err(NetQueuePairError::DescriptorChainInvalid);
+                    }
+                    next_desc = desc_chain.next();
+                }
+
+                let len = if !iovecs.is_empty() {
+                    let result = unsafe {
+                        libc::readv(
+                            tap.as_raw_fd() as libc::c_int,
+                            iovecs.as_ptr() as *const libc::iovec,
+                            iovecs.len() as libc::c_int,
+                        )
+                    };
+                    if result < 0 {
+                        let e = std::io::Error::last_os_error();
+                        exhausted_descs = false;
+                        avail_iter.go_to_previous_position();
+
+                        /* EAGAIN */
+                        if e.kind() == std::io::ErrorKind::WouldBlock {
+                            break;
+                        }
+
+                        error!("net: rx: failed reading from tap: {}", e);
+                        return Err(NetQueuePairError::ReadTap(e));
+                    }
+
+                    // Write num_buffers to guest memory. We simply write 1 as we
+                    // never spread the frame over more than one descriptor chain.
+                    desc_chain
+                        .memory()
+                        .write_obj(1u16, num_buffers_addr)
+                        .map_err(NetQueuePairError::GuestMemory)?;
+
+                    self.counter_bytes += Wrapping(result as u64 - vnet_hdr_len() as u64);
+                    self.counter_frames += Wrapping(1);
+
+                    result as u32
+                } else {
+                    0
+                };
+
+                used_desc_head = (desc_chain.head_index(), len);
+
+                // For the sake of simplicity (keeping the handling of RX_QUEUE_EVENT and
+                // RX_TAP_EVENT totally asynchronous), we always let the 'last' descriptor
+                // chain go-through even if it was over the rate limit, and simply stop
+                // processing oncoming `avail_desc` if any.
+                if let Some(rate_limiter) = rate_limiter {
+                    rate_limit_reached = !rate_limiter.consume(1, TokenType::Ops)
+                        || !rate_limiter.consume(len as u64, TokenType::Bytes);
+                }
+            } else {
                break;
            }

-            let desc = desc_chain
-                .next()
-                .ok_or(NetQueuePairError::DescriptorChainTooShort)?;
-
-            let num_buffers_addr = desc_chain
-                .memory()
-                .checked_offset(
-                    desc.addr()
-                        .translate_gva(access_platform, desc.len() as usize),
-                    10,
-                )
-                .unwrap();
-            let mut next_desc = Some(desc);
-
-            let mut iovecs = Vec::new();
-            while let Some(desc) = next_desc {
-                let desc_addr = desc
-                    .addr()
-                    .translate_gva(access_platform, desc.len() as usize);
-                if desc.is_write_only() && desc.len() > 0 {
-                    let buf = desc_chain
-                        .memory()
-                        .get_slice(desc_addr, desc.len() as usize)
-                        .map_err(NetQueuePairError::GuestMemory)?
-                        .as_ptr();
-                    let iovec = libc::iovec {
-                        iov_base: buf as *mut libc::c_void,
-                        iov_len: desc.len() as libc::size_t,
-                    };
-                    iovecs.push(iovec);
-                } else {
-                    error!(
-                        "Invalid descriptor chain: address = 0x{:x} length = {} write_only = {}",
-                        desc_addr.0,
-                        desc.len(),
-                        desc.is_write_only()
-                    );
-                    return Err(NetQueuePairError::DescriptorChainInvalid);
-                }
-                next_desc = desc_chain.next();
-            }
-
-            let len = if !iovecs.is_empty() {
-                let result = unsafe {
-                    libc::readv(
-                        tap.as_raw_fd() as libc::c_int,
-                        iovecs.as_ptr() as *const libc::iovec,
-                        iovecs.len() as libc::c_int,
-                    )
-                };
-                if result < 0 {
-                    let e = std::io::Error::last_os_error();
-                    exhausted_descs = false;
-                    queue.go_to_previous_position();
-
-                    /* EAGAIN */
-                    if e.kind() == std::io::ErrorKind::WouldBlock {
-                        break;
-                    }
-
-                    error!("net: rx: failed reading from tap: {}", e);
-                    return Err(NetQueuePairError::ReadTap(e));
-                }
-
-                // Write num_buffers to guest memory. We simply write 1 as we
-                // never spread the frame over more than one descriptor chain.
-                desc_chain
-                    .memory()
-                    .write_obj(1u16, num_buffers_addr)
-                    .map_err(NetQueuePairError::GuestMemory)?;
-
-                self.counter_bytes += Wrapping(result as u64 - vnet_hdr_len() as u64);
-                self.counter_frames += Wrapping(1);
-
-                result as u32
-            } else {
-                0
-            };
-
-            // For the sake of simplicity (keeping the handling of RX_QUEUE_EVENT and
-            // RX_TAP_EVENT totally asynchronous), we always let the 'last' descriptor
-            // chain go-through even if it was over the rate limit, and simply stop
-            // processing oncoming `avail_desc` if any.
-            if let Some(rate_limiter) = rate_limiter {
-                rate_limit_reached = !rate_limiter.consume(1, TokenType::Ops)
-                    || !rate_limiter.consume(len as u64, TokenType::Bytes);
-            }
-
            queue
-                .add_used(desc_chain.memory(), desc_chain.head_index(), len)
+                .add_used(used_desc_head.0, used_desc_head.1)
                .map_err(NetQueuePairError::QueueAddUsed)?;
-
            if !queue
-                .enable_notification(mem)
+                .enable_notification()
                .map_err(NetQueuePairError::QueueEnableNotification)?
            {
                break;
@@ -286,31 +303,31 @@ pub struct NetCounters {
    pub rx_frames: Arc<AtomicU64>,
 }

-#[derive(Error, Debug)]
+#[derive(Debug)]
 pub enum NetQueuePairError {
-    #[error("No memory configured.")]
+    /// No memory configured
    NoMemoryConfigured,
-    #[error("Error registering listener: {0}")]
+    /// Error registering listener
    RegisterListener(io::Error),
-    #[error("Error unregistering listener: {0}")]
+    /// Error unregistering listener
    UnregisterListener(io::Error),
-    #[error("Error writing to the TAP device: {0}")]
+    /// Error writing to the TAP device
    WriteTap(io::Error),
-    #[error("Error reading from the TAP device: {0}")]
+    /// Error reading from the TAP device
    ReadTap(io::Error),
-    #[error("Error related to guest memory: {0}")]
+    /// Error related to guest memory
    GuestMemory(vm_memory::GuestMemoryError),
-    #[error("Returned an error while iterating through the queue: {0}")]
+    /// Returned an error while iterating through the queue
    QueueIteratorFailed(virtio_queue::Error),
-    #[error("Descriptor chain is too short.")]
+    /// Descriptor chain is too short
    DescriptorChainTooShort,
-    #[error("Descriptor chain does not contain valid descriptors.")]
+    /// Descriptor chain does not contain valid descriptors
    DescriptorChainInvalid,
-    #[error("Failed to determine if queue needed notification: {0}")]
+    /// Failed to determine if queue needed notification
    QueueNeedsNotification(virtio_queue::Error),
-    #[error("Failed to enable notification on the queue: {0}")]
+    /// Failed to enable notification on the queue
    QueueEnableNotification(virtio_queue::Error),
-    #[error("Failed to add used index to the queue: {0}")]
+    /// Failed to add used index to the queue
    QueueAddUsed(virtio_queue::Error),
 }

@@ -338,11 +355,9 @@ pub struct NetQueuePair {
 impl NetQueuePair {
    pub fn process_tx(
        &mut self,
-        mem: &GuestMemoryMmap,
-        queue: &mut Queue,
+        queue: &mut Queue<GuestMemoryAtomic<GuestMemoryMmap>>,
    ) -> Result<bool, NetQueuePairError> {
        let tx_tap_retry = self.tx.process_desc_chain(
-            mem,
            &mut self.tap,
            queue,
            &mut self.tx_rate_limiter,
@@ -382,17 +397,15 @@ impl NetQueuePair {
        self.tx.counter_frames = Wrapping(0);

        queue
-            .needs_notification(mem)
+            .needs_notification()
            .map_err(NetQueuePairError::QueueNeedsNotification)
    }

    pub fn process_rx(
        &mut self,
-        mem: &GuestMemoryMmap,
-        queue: &mut Queue,
+        queue: &mut Queue<GuestMemoryAtomic<GuestMemoryMmap>>,
    ) -> Result<bool, NetQueuePairError> {
        self.rx_desc_avail = !self.rx.process_desc_chain(
-            mem,
            &mut self.tap,
            queue,
            &mut self.rx_rate_limiter,
@@ -427,7 +440,7 @@ impl NetQueuePair {
        self.rx.counter_frames = Wrapping(0);

        queue
-            .needs_notification(mem)
+            .needs_notification()
            .map_err(NetQueuePairError::QueueNeedsNotification)
    }
 }
--- a/net_util/src/tap.rs
+++ b/net_util/src/tap.rs
@@ -15,26 +15,24 @@ use std::io::{Error as IoError, Read, Result as IoResult, Write};
 use std::net;
 use std::os::raw::*;
 use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
-use thiserror::Error;
 use vmm_sys_util::ioctl::{ioctl_with_mut_ref, ioctl_with_ref, ioctl_with_val};

-#[derive(Error, Debug)]
+#[derive(Debug)]
 pub enum Error {
-    #[error("Couldn't open /dev/net/tun: {0}")]
+    /// Couldn't open /dev/net/tun.
    OpenTun(IoError),
-    #[error("Unable to configure tap interface: {0}")]
+    /// Unable to configure tap interface.
    ConfigureTap(IoError),
-    #[error("Unable to retrieve features: {0}")]
+    /// Unable to retrieve features.
    GetFeatures(IoError),
-    #[error("Missing multiqueue support in the kernel.")]
+    /// Missing multiqueue support in the kernel.
    MultiQueueKernelSupport,
-    #[error("ioctl failed: {0}")]
+    /// ioctl failed.
    IoctlError(IoError),
-    #[error("Failed to create a socket: {0}")]
+    /// Failed to create a socket.
    NetUtil(NetUtilError),
-    #[error("Invalid interface name.")]
    InvalidIfname,
-    #[error("Error parsing MAC data: {0}")]
+    /// Error parsing MAC data
    MacParsing(IoError),
 }

@@ -323,13 +321,15 @@ impl Tap {

        // If TAP device is already up don't try and enable it
        let ifru_flags = unsafe { ifreq.ifr_ifru.ifru_flags };
-        if ifru_flags & net_gen::net_device_flags_IFF_UP as i16
-            == net_gen::net_device_flags_IFF_UP as i16
+        if ifru_flags
+            & (net_gen::net_device_flags_IFF_UP | net_gen::net_device_flags_IFF_RUNNING) as i16
+            == (net_gen::net_device_flags_IFF_UP | net_gen::net_device_flags_IFF_RUNNING) as i16
        {
            return Ok(());
        }

-        ifreq.ifr_ifru.ifru_flags = net_gen::net_device_flags_IFF_UP as i16;
+        ifreq.ifr_ifru.ifru_flags =
+            (net_gen::net_device_flags_IFF_UP | net_gen::net_device_flags_IFF_RUNNING) as i16;

        // ioctl is safe. Called with a valid sock fd, and we check the return.
        let ret =
@@ -395,35 +395,38 @@ impl AsRawFd for Tap {

 #[cfg(test)]
 mod tests {
+    extern crate pnet;
+
    use std::net::Ipv4Addr;
    use std::str;
    use std::sync::{mpsc, Mutex};
    use std::thread;
    use std::time::Duration;

-    use once_cell::sync::Lazy;
-
-    use pnet::packet::ethernet::{EtherTypes, EthernetPacket, MutableEthernetPacket};
-    use pnet::packet::ip::IpNextHeaderProtocols;
-    use pnet::packet::ipv4::{Ipv4Packet, MutableIpv4Packet};
-    use pnet::packet::udp::{MutableUdpPacket, UdpPacket};
-    use pnet::packet::{MutablePacket, Packet};
-    use pnet::util::MacAddr;
-    use pnet_datalink::Channel::Ethernet;
-    use pnet_datalink::{DataLinkReceiver, DataLinkSender, NetworkInterface};
+    use self::pnet::datalink::Channel::Ethernet;
+    use self::pnet::datalink::{self, DataLinkReceiver, DataLinkSender, NetworkInterface};
+    use self::pnet::packet::ethernet::{EtherTypes, EthernetPacket, MutableEthernetPacket};
+    use self::pnet::packet::ip::IpNextHeaderProtocols;
+    use self::pnet::packet::ipv4::{Ipv4Packet, MutableIpv4Packet};
+    use self::pnet::packet::udp::{MutableUdpPacket, UdpPacket};
+    use self::pnet::packet::{MutablePacket, Packet};
+    use self::pnet::util::MacAddr;

    use super::*;

    static DATA_STRING: &str = "test for tap";
    static SUBNET_MASK: &str = "255.255.255.0";

-    // We needed to have a mutex as a global variable, so we used once_cell for testing. The main
-    // potential problem, caused by tests being run in parallel by cargo, is creating different
-    // TAPs and trying to associate the same address, so we hide the IP address &str behind this
-    // mutex, more as a convention to remember to lock it at the very beginning of each function
-    // susceptible to this issue. Another variant is to use a different IP address per function,
-    // but we must remember to pick an unique one each time.
-    static TAP_IP_LOCK: Lazy<Mutex<&'static str>> = Lazy::new(|| Mutex::new("192.168.241.1"));
+    // We needed to have a mutex as a global variable, so we used the crate that provides the
+    // lazy_static! macro for testing. The main potential problem, caused by tests being run in
+    // parallel by cargo, is creating different TAPs and trying to associate the same address,
+    // so we hide the IP address &str behind this mutex, more as a convention to remember to lock
+    // it at the very beginning of each function susceptible to this issue. Another variant is
+    // to use a different IP address per function, but we must remember to pick an unique one
+    // each time.
+    lazy_static! {
+        static ref TAP_IP_LOCK: Mutex<&'static str> = Mutex::new("192.168.241.1");
+    }

    // Describes the outcomes we are currently interested in when parsing a packet (we use
    // an UDP packet for testing).
@@ -540,10 +543,10 @@ mod tests {
        let interface_name_matches = |iface: &NetworkInterface| iface.name == ifname;

        // Find the network interface with the provided name.
-        let interfaces = pnet_datalink::interfaces();
+        let interfaces = datalink::interfaces();
        let interface = interfaces.into_iter().find(interface_name_matches).unwrap();

-        if let Ok(Ethernet(tx, rx)) = pnet_datalink::channel(&interface, Default::default()) {
+        if let Ok(Ethernet(tx, rx)) = datalink::channel(&interface, Default::default()) {
            (interface.mac.unwrap(), tx, rx)
        } else {
            panic!("datalink channel error or unhandled channel type");
--- a/option_parser/src/lib.rs
+++ b/option_parser/src/lib.rs
@@ -31,48 +31,34 @@ impl fmt::Display for OptionParserError {
            OptionParserError::UnknownOption(s) => write!(f, "unknown option: {}", s),
            OptionParserError::InvalidSyntax(s) => write!(f, "invalid syntax:{}", s),
            OptionParserError::Conversion(field, value) => {
-                write!(f, "unable to convert {} for {}", value, field)
+                write!(f, "unable to parse {} for {}", value, field)
            }
        }
    }
 }
 type OptionParserResult<T> = std::result::Result<T, OptionParserError>;

-fn split_commas(s: &str) -> OptionParserResult<Vec<String>> {
+fn split_commas_outside_brackets(s: &str) -> OptionParserResult<Vec<String>> {
    let mut list: Vec<String> = Vec::new();
-    let mut opened_brackets = 0;
-    let mut in_quotes = false;
-    let mut current = String::new();
-
-    for c in s.trim().chars() {
-        match c {
-            '[' => {
-                opened_brackets += 1;
-                current.push('[');
+    let mut opened_brackets: usize = 0;
+    for element in s.trim().split(',') {
+        if opened_brackets > 0 {
+            if let Some(last) = list.last_mut() {
+                *last = format!("{},{}", last, element);
+            } else {
+                return Err(OptionParserError::InvalidSyntax(s.to_owned()));
            }
-            ']' => {
-                opened_brackets -= 1;
-                if opened_brackets < 0 {
-                    return Err(OptionParserError::InvalidSyntax(s.to_owned()));
-                }
-                current.push(']');
-            }
-            '"' => in_quotes = !in_quotes,
-            ',' => {
-                if opened_brackets > 0 || in_quotes {
-                    current.push(',')
-                } else {
-                    list.push(current);
-                    current = String::new();
-                }
-            }
-            c => current.push(c),
+        } else {
+            list.push(element.to_string());
        }
-    }
-    list.push(current);

-    if opened_brackets != 0 || in_quotes {
-        return Err(OptionParserError::InvalidSyntax(s.to_owned()));
+        opened_brackets += element.matches('[').count();
+        let closing_brackets = element.matches(']').count();
+        if closing_brackets > opened_brackets {
+            return Err(OptionParserError::InvalidSyntax(s.to_owned()));
+        } else {
+            opened_brackets -= closing_brackets;
+        }
    }

    Ok(list)
@@ -90,8 +76,8 @@ impl OptionParser {
            return Ok(());
        }

-        for option in split_commas(input)?.iter() {
-            let parts: Vec<&str> = option.splitn(2, '=').collect();
+        for option in split_commas_outside_brackets(input)?.iter() {
+            let parts: Vec<&str> = option.split('=').collect();

            match self.options.get_mut(parts[0]) {
                None => return Err(OptionParserError::UnknownOption(parts[0].to_owned())),
@@ -305,13 +291,9 @@ impl<S: FromStr, T: TupleValue> FromStr for Tuple<S, T> {
    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
        let mut list: Vec<(S, T)> = Vec::new();

-        let body = s
-            .trim()
-            .strip_prefix('[')
-            .and_then(|s| s.strip_suffix(']'))
-            .ok_or_else(|| TupleError::InvalidValue(s.to_string()))?;
-
-        let tuples_list = split_commas(body).map_err(TupleError::SplitOutsideBrackets)?;
+        let tuples_list =
+            split_commas_outside_brackets(s.trim().trim_matches(|c| c == '[' || c == ']'))
+                .map_err(TupleError::SplitOutsideBrackets)?;
        for tuple in tuples_list.iter() {
            let items: Vec<&str> = tuple.split('@').collect();

@@ -352,58 +334,3 @@ impl FromStr for StringList {
        Ok(StringList(string_list))
    }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_option_parser() {
-        let mut parser = OptionParser::new();
-        parser
-            .add("size")
-            .add("mergeable")
-            .add("hotplug_method")
-            .add("hotplug_size")
-            .add("topology")
-            .add("cmdline");
-
-        assert!(parser.parse("size=128M,hanging_param").is_err());
-        assert!(parser.parse("size=128M,too_many_equals=foo=bar").is_err());
-        assert!(parser.parse("size=128M,file=/dev/shm").is_err());
-
-        assert!(parser.parse("size=128M").is_ok());
-        assert_eq!(parser.get("size"), Some("128M".to_owned()));
-        assert!(!parser.is_set("mergeable"));
-        assert!(parser.is_set("size"));
-
-        assert!(parser.parse("size=128M,mergeable=on").is_ok());
-        assert_eq!(parser.get("size"), Some("128M".to_owned()));
-        assert_eq!(parser.get("mergeable"), Some("on".to_owned()));
-
-        assert!(parser
-            .parse("size=128M,mergeable=on,topology=[1,2]")
-            .is_ok());
-        assert_eq!(parser.get("size"), Some("128M".to_owned()));
-        assert_eq!(parser.get("mergeable"), Some("on".to_owned()));
-        assert_eq!(parser.get("topology"), Some("[1,2]".to_owned()));
-
-        assert!(parser
-            .parse("size=128M,mergeable=on,topology=[[1,2],[3,4]]")
-            .is_ok());
-        assert_eq!(parser.get("size"), Some("128M".to_owned()));
-        assert_eq!(parser.get("mergeable"), Some("on".to_owned()));
-        assert_eq!(parser.get("topology"), Some("[[1,2],[3,4]]".to_owned()));
-
-        assert!(parser.parse("topology=[").is_err());
-        assert!(parser.parse("topology=[[[]]]]").is_err());
-
-        assert!(parser.parse("cmdline=\"console=ttyS0,9600n8\"").is_ok());
-        assert_eq!(
-            parser.get("cmdline"),
-            Some("console=ttyS0,9600n8".to_owned())
-        );
-        assert!(parser.parse("cmdline=\"").is_err());
-        assert!(parser.parse("cmdline=\"\"\"").is_err());
-    }
-}
--- a/pci/Cargo.toml
+++ b/pci/Cargo.toml
@@ -10,21 +10,22 @@ kvm = ["vfio-ioctls/kvm"]
 mshv = ["vfio-ioctls/mshv"]

 [dependencies]
-anyhow = "1.0.62"
+anyhow = "1.0.56"
 byteorder = "1.4.3"
 hypervisor = { path = "../hypervisor" }
 vfio-ioctls = { git = "https://github.com/rust-vmm/vfio", branch = "main", default-features = false }
 vfio_user = { path = "../vfio_user" }
-vmm-sys-util = "0.10.0"
-libc = "0.2.131"
-log = "0.4.17"
-serde = { version = "1.0.143", features = ["derive"] }
-thiserror = "1.0.32"
+vmm-sys-util = "0.9.0"
+libc = "0.2.123"
+log = "0.4.16"
+serde = "1.0.136"
+serde_derive = "1.0.136"
+thiserror = "1.0.30"
 versionize = "0.1.6"
 versionize_derive = "0.1.4"
 vm-allocator = { path = "../vm-allocator" }
 vm-device = { path = "../vm-device" }
-vm-memory = "0.8.0"
+vm-memory = "0.7.0"
 vm-migration = { path = "../vm-migration" }

 [dependencies.vfio-bindings]
--- a/pci/src/bus.rs
+++ b/pci/src/bus.rs
@@ -6,13 +6,13 @@ use crate::configuration::{
    PciBarRegionType, PciBridgeSubclass, PciClassCode, PciConfiguration, PciHeaderType,
 };
 use crate::device::{DeviceRelocation, Error as PciDeviceError, PciDevice};
-use crate::PciBarConfiguration;
 use byteorder::{ByteOrder, LittleEndian};
 use std::any::Any;
 use std::collections::HashMap;
 use std::ops::DerefMut;
 use std::sync::{Arc, Barrier, Mutex};
 use vm_device::{Bus, BusDevice};
+use vm_memory::{Address, GuestAddress, GuestUsize};

 const VENDOR_ID_INTEL: u16 = 0x8086;
 const DEVICE_ID_INTEL_VIRT_PCIE_HOST: u16 = 0x0d57;
@@ -88,10 +88,6 @@ impl PciDevice for PciRoot {
    fn as_any(&mut self) -> &mut dyn Any {
        self
    }
-
-    fn id(&self) -> Option<String> {
-        None
-    }
 }

 pub struct PciBus {
@@ -122,21 +118,21 @@ impl PciBus {
        dev: Arc<Mutex<dyn BusDevice>>,
        #[cfg(target_arch = "x86_64")] io_bus: &Bus,
        mmio_bus: &Bus,
-        bars: Vec<PciBarConfiguration>,
+        bars: Vec<(GuestAddress, GuestUsize, PciBarRegionType)>,
    ) -> Result<()> {
-        for bar in bars {
-            match bar.region_type() {
+        for (address, size, type_) in bars {
+            match type_ {
                PciBarRegionType::IoRegion => {
                    #[cfg(target_arch = "x86_64")]
                    io_bus
-                        .insert(dev.clone(), bar.addr(), bar.size())
+                        .insert(dev.clone(), address.raw_value(), size)
                        .map_err(PciRootError::PioInsert)?;
                    #[cfg(target_arch = "aarch64")]
                    error!("I/O region is not supported");
                }
                PciBarRegionType::Memory32BitRegion | PciBarRegionType::Memory64BitRegion => {
                    mmio_bus
-                        .insert(dev.clone(), bar.addr(), bar.size())
+                        .insert(dev.clone(), address.raw_value(), size)
                        .map_err(PciRootError::MmioInsert)?;
                }
            }
--- a/pci/src/configuration.rs
+++ b/pci/src/configuration.rs
@@ -9,7 +9,6 @@ use std::fmt::{self, Display};
 use std::sync::{Arc, Mutex};
 use versionize::{VersionMap, Versionize, VersionizeError, VersionizeResult};
 use versionize_derive::Versionize;
-use vm_device::PciBarType;
 use vm_migration::{MigratableError, Pausable, Snapshot, Snapshottable, VersionMapped};

 // The number of 32bit registers in the config space, 4096 bytes.
@@ -19,7 +18,6 @@ const STATUS_REG: usize = 1;
 const STATUS_REG_CAPABILITIES_USED_MASK: u32 = 0x0010_0000;
 const BAR0_REG: usize = 4;
 const ROM_BAR_REG: usize = 12;
-const ROM_BAR_IDX: usize = 6;
 const BAR_IO_ADDR_MASK: u32 = 0xffff_fffc;
 const BAR_MEM_ADDR_MASK: u32 = 0xffff_fff0;
 const ROM_BAR_ADDR_MASK: u32 = 0xffff_f800;
@@ -187,10 +185,10 @@ pub trait PciProgrammingInterface {
 }

 /// Types of PCI capabilities.
-#[derive(PartialEq, Eq, Copy, Clone)]
+#[derive(PartialEq, Copy, Clone)]
 #[allow(dead_code)]
 #[allow(non_camel_case_types)]
-#[repr(u8)]
+#[repr(C)]
 pub enum PciCapabilityId {
    ListId = 0,
    PowerManagement = 0x01,
@@ -244,118 +242,6 @@ impl From<u8> for PciCapabilityId {
    }
 }

-/// Types of PCI Express capabilities.
-#[derive(PartialEq, Eq, Copy, Clone, Debug)]
-#[allow(dead_code)]
-#[repr(u16)]
-pub enum PciExpressCapabilityId {
-    NullCapability = 0x0000,
-    AdvancedErrorReporting = 0x0001,
-    VirtualChannelMultiFunctionVirtualChannelNotPresent = 0x0002,
-    DeviceSerialNumber = 0x0003,
-    PowerBudgeting = 0x0004,
-    RootComplexLinkDeclaration = 0x0005,
-    RootComplexInternalLinkControl = 0x0006,
-    RootComplexEventCollectorEndpointAssociation = 0x0007,
-    MultiFunctionVirtualChannel = 0x0008,
-    VirtualChannelMultiFunctionVirtualChannelPresent = 0x0009,
-    RootComplexRegisterBlock = 0x000a,
-    VendorSpecificExtendedCapability = 0x000b,
-    ConfigurationAccessCorrelation = 0x000c,
-    AccessControlServices = 0x000d,
-    AlternativeRoutingIdentificationIntepretation = 0x000e,
-    AddressTranslationServices = 0x000f,
-    SingleRootIoVirtualization = 0x0010,
-    DeprecatedMultiRootIoVirtualzation = 0x0011,
-    Multicast = 0x0012,
-    PageRequestInterface = 0x0013,
-    ReservedForAmd = 0x0014,
-    ResizeableBar = 0x0015,
-    DynamicPowerAllocation = 0x0016,
-    ThpRequester = 0x0017,
-    LatencyToleranceReporting = 0x0018,
-    SecondaryPciExpress = 0x0019,
-    ProtocolMultiplexing = 0x001a,
-    ProcessAddressSpaceId = 0x001b,
-    LnRequestor = 0x001c,
-    DownstreamPortContainment = 0x001d,
-    L1PmSubstates = 0x001e,
-    PrecisionTimeMeasurement = 0x001f,
-    PciExpressOverMphy = 0x0020,
-    FRSQueueing = 0x0021,
-    ReadinessTimeReporting = 0x0022,
-    DesignatedVendorSpecificExtendedCapability = 0x0023,
-    VfResizeableBar = 0x0024,
-    DataLinkFeature = 0x0025,
-    PhysicalLayerSixteenGts = 0x0026,
-    LaneMargeningAtTheReceiver = 0x0027,
-    HierarchyId = 0x0028,
-    NativePcieEnclosureManagement = 0x0029,
-    PhysicalLayerThirtyTwoGts = 0x002a,
-    AlternateProtocol = 0x002b,
-    SystemFirmwareIntermediary = 0x002c,
-    ShadowFunctions = 0x002d,
-    DataObjectExchange = 0x002e,
-    Reserved = 0x002f,
-    ExtendedCapabilitiesAbsence = 0xffff,
-}
-
-impl From<u16> for PciExpressCapabilityId {
-    fn from(c: u16) -> Self {
-        match c {
-            0x0000 => PciExpressCapabilityId::NullCapability,
-            0x0001 => PciExpressCapabilityId::AdvancedErrorReporting,
-            0x0002 => PciExpressCapabilityId::VirtualChannelMultiFunctionVirtualChannelNotPresent,
-            0x0003 => PciExpressCapabilityId::DeviceSerialNumber,
-            0x0004 => PciExpressCapabilityId::PowerBudgeting,
-            0x0005 => PciExpressCapabilityId::RootComplexLinkDeclaration,
-            0x0006 => PciExpressCapabilityId::RootComplexInternalLinkControl,
-            0x0007 => PciExpressCapabilityId::RootComplexEventCollectorEndpointAssociation,
-            0x0008 => PciExpressCapabilityId::MultiFunctionVirtualChannel,
-            0x0009 => PciExpressCapabilityId::VirtualChannelMultiFunctionVirtualChannelPresent,
-            0x000a => PciExpressCapabilityId::RootComplexRegisterBlock,
-            0x000b => PciExpressCapabilityId::VendorSpecificExtendedCapability,
-            0x000c => PciExpressCapabilityId::ConfigurationAccessCorrelation,
-            0x000d => PciExpressCapabilityId::AccessControlServices,
-            0x000e => PciExpressCapabilityId::AlternativeRoutingIdentificationIntepretation,
-            0x000f => PciExpressCapabilityId::AddressTranslationServices,
-            0x0010 => PciExpressCapabilityId::SingleRootIoVirtualization,
-            0x0011 => PciExpressCapabilityId::DeprecatedMultiRootIoVirtualzation,
-            0x0012 => PciExpressCapabilityId::Multicast,
-            0x0013 => PciExpressCapabilityId::PageRequestInterface,
-            0x0014 => PciExpressCapabilityId::ReservedForAmd,
-            0x0015 => PciExpressCapabilityId::ResizeableBar,
-            0x0016 => PciExpressCapabilityId::DynamicPowerAllocation,
-            0x0017 => PciExpressCapabilityId::ThpRequester,
-            0x0018 => PciExpressCapabilityId::LatencyToleranceReporting,
-            0x0019 => PciExpressCapabilityId::SecondaryPciExpress,
-            0x001a => PciExpressCapabilityId::ProtocolMultiplexing,
-            0x001b => PciExpressCapabilityId::ProcessAddressSpaceId,
-            0x001c => PciExpressCapabilityId::LnRequestor,
-            0x001d => PciExpressCapabilityId::DownstreamPortContainment,
-            0x001e => PciExpressCapabilityId::L1PmSubstates,
-            0x001f => PciExpressCapabilityId::PrecisionTimeMeasurement,
-            0x0020 => PciExpressCapabilityId::PciExpressOverMphy,
-            0x0021 => PciExpressCapabilityId::FRSQueueing,
-            0x0022 => PciExpressCapabilityId::ReadinessTimeReporting,
-            0x0023 => PciExpressCapabilityId::DesignatedVendorSpecificExtendedCapability,
-            0x0024 => PciExpressCapabilityId::VfResizeableBar,
-            0x0025 => PciExpressCapabilityId::DataLinkFeature,
-            0x0026 => PciExpressCapabilityId::PhysicalLayerSixteenGts,
-            0x0027 => PciExpressCapabilityId::LaneMargeningAtTheReceiver,
-            0x0028 => PciExpressCapabilityId::HierarchyId,
-            0x0029 => PciExpressCapabilityId::NativePcieEnclosureManagement,
-            0x002a => PciExpressCapabilityId::PhysicalLayerThirtyTwoGts,
-            0x002b => PciExpressCapabilityId::AlternateProtocol,
-            0x002c => PciExpressCapabilityId::SystemFirmwareIntermediary,
-            0x002d => PciExpressCapabilityId::ShadowFunctions,
-            0x002e => PciExpressCapabilityId::DataObjectExchange,
-            0xffff => PciExpressCapabilityId::ExtendedCapabilitiesAbsence,
-            _ => PciExpressCapabilityId::Reserved,
-        }
-    }
-}
-
 /// A PCI capability list. Devices can optionally specify capabilities in their configuration space.
 pub trait PciCapability {
    fn bytes(&self) -> &[u8];
@@ -433,55 +319,24 @@ pub struct PciConfiguration {
 }

 /// See pci_regs.h in kernel
-#[derive(Copy, Clone, PartialEq, Eq, Versionize, Debug)]
+#[derive(Copy, Clone, PartialEq, Versionize, Debug)]
 pub enum PciBarRegionType {
    Memory32BitRegion = 0,
    IoRegion = 0x01,
    Memory64BitRegion = 0x04,
 }

-impl From<PciBarType> for PciBarRegionType {
-    fn from(type_: PciBarType) -> Self {
-        match type_ {
-            PciBarType::Io => PciBarRegionType::IoRegion,
-            PciBarType::Mmio32 => PciBarRegionType::Memory32BitRegion,
-            PciBarType::Mmio64 => PciBarRegionType::Memory64BitRegion,
-        }
-    }
-}
-
-#[allow(clippy::from_over_into)]
-impl Into<PciBarType> for PciBarRegionType {
-    fn into(self) -> PciBarType {
-        match self {
-            PciBarRegionType::IoRegion => PciBarType::Io,
-            PciBarRegionType::Memory32BitRegion => PciBarType::Mmio32,
-            PciBarRegionType::Memory64BitRegion => PciBarType::Mmio64,
-        }
-    }
-}
-
 #[derive(Copy, Clone)]
 pub enum PciBarPrefetchable {
    NotPrefetchable = 0,
    Prefetchable = 0x08,
 }

-#[allow(clippy::from_over_into)]
-impl Into<bool> for PciBarPrefetchable {
-    fn into(self) -> bool {
-        match self {
-            PciBarPrefetchable::NotPrefetchable => false,
-            PciBarPrefetchable::Prefetchable => true,
-        }
-    }
-}
-
 #[derive(Copy, Clone)]
 pub struct PciBarConfiguration {
    addr: u64,
    size: u64,
-    idx: usize,
+    reg_idx: usize,
    region_type: PciBarRegionType,
    prefetchable: PciBarPrefetchable,
 }
@@ -701,23 +556,22 @@ impl PciConfiguration {

    /// Adds a region specified by `config`.  Configures the specified BAR(s) to
    /// report this region and size to the guest kernel.  Enforces a few constraints
-    /// (i.e, region size must be power of two, register not already used).
-    pub fn add_pci_bar(&mut self, config: &PciBarConfiguration) -> Result<()> {
-        let bar_idx = config.idx;
-        let reg_idx = BAR0_REG + bar_idx;
-
-        if self.bars[bar_idx].used {
-            return Err(Error::BarInUse(bar_idx));
+    /// (i.e, region size must be power of two, register not already used). Returns 'None' on
+    /// failure all, `Some(BarIndex)` on success.
+    pub fn add_pci_bar(&mut self, config: &PciBarConfiguration) -> Result<usize> {
+        if self.bars[config.reg_idx].used {
+            return Err(Error::BarInUse(config.reg_idx));
        }

        if config.size.count_ones() != 1 {
            return Err(Error::BarSizeInvalid(config.size));
        }

-        if bar_idx >= NUM_BAR_REGS {
-            return Err(Error::BarInvalid(bar_idx));
+        if config.reg_idx >= NUM_BAR_REGS {
+            return Err(Error::BarInvalid(config.reg_idx));
        }

+        let bar_idx = BAR0_REG + config.reg_idx;
        let end_addr = config
            .addr
            .checked_add(config.size - 1)
@@ -730,20 +584,20 @@ impl PciConfiguration {

                // Encode the BAR size as expected by the software running in
                // the guest.
-                self.bars[bar_idx].size =
+                self.bars[config.reg_idx].size =
                    encode_32_bits_bar_size(config.size as u32).ok_or(Error::Encode32BarSize)?;
            }
            PciBarRegionType::Memory64BitRegion => {
-                if bar_idx + 1 >= NUM_BAR_REGS {
-                    return Err(Error::BarInvalid64(bar_idx));
+                if config.reg_idx + 1 >= NUM_BAR_REGS {
+                    return Err(Error::BarInvalid64(config.reg_idx));
                }

                if end_addr > u64::max_value() {
                    return Err(Error::BarAddressInvalid(config.addr, config.size));
                }

-                if self.bars[bar_idx + 1].used {
-                    return Err(Error::BarInUse64(bar_idx));
+                if self.bars[config.reg_idx + 1].used {
+                    return Err(Error::BarInUse64(config.reg_idx));
                }

                // Encode the BAR size as expected by the software running in
@@ -751,12 +605,12 @@ impl PciConfiguration {
                let (bar_size_hi, bar_size_lo) =
                    encode_64_bits_bar_size(config.size).ok_or(Error::Encode64BarSize)?;

-                self.registers[reg_idx + 1] = (config.addr >> 32) as u32;
-                self.writable_bits[reg_idx + 1] = 0xffff_ffff;
-                self.bars[bar_idx + 1].addr = self.registers[reg_idx + 1];
-                self.bars[bar_idx].size = bar_size_lo;
-                self.bars[bar_idx + 1].size = bar_size_hi;
-                self.bars[bar_idx + 1].used = true;
+                self.registers[bar_idx + 1] = (config.addr >> 32) as u32;
+                self.writable_bits[bar_idx + 1] = 0xffff_ffff;
+                self.bars[config.reg_idx + 1].addr = self.registers[bar_idx + 1];
+                self.bars[config.reg_idx].size = bar_size_lo;
+                self.bars[config.reg_idx + 1].size = bar_size_hi;
+                self.bars[config.reg_idx + 1].used = true;
            }
        }

@@ -768,30 +622,26 @@ impl PciConfiguration {
            PciBarRegionType::IoRegion => (BAR_IO_ADDR_MASK, config.region_type as u32),
        };

-        self.registers[reg_idx] = ((config.addr as u32) & mask) | lower_bits;
-        self.writable_bits[reg_idx] = mask;
-        self.bars[bar_idx].addr = self.registers[reg_idx];
-        self.bars[bar_idx].used = true;
-        self.bars[bar_idx].r#type = Some(config.region_type);
-
-        Ok(())
+        self.registers[bar_idx] = ((config.addr as u32) & mask) | lower_bits;
+        self.writable_bits[bar_idx] = mask;
+        self.bars[config.reg_idx].addr = self.registers[bar_idx];
+        self.bars[config.reg_idx].used = true;
+        self.bars[config.reg_idx].r#type = Some(config.region_type);
+        Ok(config.reg_idx)
    }

    /// Adds rom expansion BAR.
-    pub fn add_pci_rom_bar(&mut self, config: &PciBarConfiguration, active: u32) -> Result<()> {
-        let bar_idx = config.idx;
-        let reg_idx = ROM_BAR_REG;
-
+    pub fn add_pci_rom_bar(&mut self, config: &PciBarConfiguration, active: u32) -> Result<usize> {
        if self.rom_bar_used {
-            return Err(Error::RomBarInUse(bar_idx));
+            return Err(Error::RomBarInUse(config.reg_idx));
        }

        if config.size.count_ones() != 1 {
            return Err(Error::RomBarSizeInvalid(config.size));
        }

-        if bar_idx != ROM_BAR_IDX {
-            return Err(Error::RomBarInvalid(bar_idx));
+        if config.reg_idx != ROM_BAR_REG {
+            return Err(Error::RomBarInvalid(config.reg_idx));
        }

        let end_addr = config
@@ -803,14 +653,13 @@ impl PciConfiguration {
            return Err(Error::RomBarAddressInvalid(config.addr, config.size));
        }

-        self.registers[reg_idx] = (config.addr as u32) | active;
-        self.writable_bits[reg_idx] = ROM_BAR_ADDR_MASK;
-        self.rom_bar_addr = self.registers[reg_idx];
+        self.registers[config.reg_idx] = (config.addr as u32) | active;
+        self.writable_bits[config.reg_idx] = ROM_BAR_ADDR_MASK;
+        self.rom_bar_addr = self.registers[config.reg_idx];
        self.rom_bar_size =
            encode_32_bits_bar_size(config.size as u32).ok_or(Error::Encode32BarSize)?;
        self.rom_bar_used = true;
-
-        Ok(())
+        Ok(config.reg_idx)
    }

    /// Returns the address of the given BAR region.
@@ -1062,7 +911,7 @@ impl Snapshottable for PciConfiguration {
 impl Default for PciBarConfiguration {
    fn default() -> Self {
        PciBarConfiguration {
-            idx: 0,
+            reg_idx: 0,
            addr: 0,
            size: 0,
            region_type: PciBarRegionType::Memory64BitRegion,
@@ -1073,13 +922,13 @@ impl Default for PciBarConfiguration {

 impl PciBarConfiguration {
    pub fn new(
-        idx: usize,
+        reg_idx: usize,
        size: u64,
        region_type: PciBarRegionType,
        prefetchable: PciBarPrefetchable,
    ) -> Self {
        PciBarConfiguration {
-            idx,
+            reg_idx,
            addr: 0,
            size,
            region_type,
@@ -1088,8 +937,8 @@ impl PciBarConfiguration {
    }

    #[must_use]
-    pub fn set_index(mut self, idx: usize) -> Self {
-        self.idx = idx;
+    pub fn set_register_index(mut self, reg_idx: usize) -> Self {
+        self.reg_idx = reg_idx;
        self
    }

@@ -1105,37 +954,15 @@ impl PciBarConfiguration {
        self
    }

+    pub fn get_size(&self) -> u64 {
+        self.size
+    }
+
    #[must_use]
    pub fn set_region_type(mut self, region_type: PciBarRegionType) -> Self {
        self.region_type = region_type;
        self
    }
-
-    #[must_use]
-    pub fn set_prefetchable(mut self, prefetchable: PciBarPrefetchable) -> Self {
-        self.prefetchable = prefetchable;
-        self
-    }
-
-    pub fn idx(&self) -> usize {
-        self.idx
-    }
-
-    pub fn addr(&self) -> u64 {
-        self.addr
-    }
-
-    pub fn size(&self) -> u64 {
-        self.size
-    }
-
-    pub fn region_type(&self) -> PciBarRegionType {
-        self.region_type
-    }
-
-    pub fn prefetchable(&self) -> PciBarPrefetchable {
-        self.prefetchable
-    }
 }

 #[cfg(test)]
--- a/pci/src/device.rs
+++ b/pci/src/device.rs
@@ -3,13 +3,13 @@
 // found in the LICENSE-BSD-3-Clause file.

 use crate::configuration::{self, PciBarRegionType};
-use crate::PciBarConfiguration;
 use std::any::Any;
 use std::fmt::{self, Display};
 use std::sync::{Arc, Barrier, Mutex};
 use std::{self, io, result};
 use vm_allocator::{AddressAllocator, SystemAllocator};
-use vm_device::{BusDevice, Resource};
+use vm_device::BusDevice;
+use vm_memory::{GuestAddress, GuestUsize};

 #[derive(Debug)]
 pub enum Error {
@@ -19,8 +19,6 @@ pub enum Error {
    IoAllocationFailed(u64),
    /// Registering an IO BAR failed.
    IoRegistrationFailed(u64, configuration::Error),
-    /// Expected resource not found.
-    MissingResource,
 }
 pub type Result<T> = std::result::Result<T, Error>;

@@ -36,7 +34,6 @@ impl Display for Error {
            IoRegistrationFailed(addr, e) => {
                write!(f, "failed to register an IO BAR, addr={} err={}", addr, e)
            }
-            MissingResource => write!(f, "failed to find expected resource"),
        }
    }
 }
@@ -56,8 +53,7 @@ pub trait PciDevice: BusDevice {
        &mut self,
        _allocator: &Arc<Mutex<SystemAllocator>>,
        _mmio_allocator: &mut AddressAllocator,
-        _resources: Option<Vec<Resource>>,
-    ) -> Result<Vec<PciBarConfiguration>> {
+    ) -> Result<Vec<(GuestAddress, GuestUsize, PciBarRegionType)>> {
        Ok(Vec::new())
    }

@@ -107,9 +103,6 @@ pub trait PciDevice: BusDevice {
    /// Provides a mutable reference to the Any trait. This is useful to let
    /// the caller have access to the underlying type behind the trait.
    fn as_any(&mut self) -> &mut dyn Any;
-
-    /// Optionally returns a unique identifier.
-    fn id(&self) -> Option<String>;
 }

 /// This trait defines a set of functions which can be triggered whenever a
--- a/pci/src/lib.rs
+++ b/pci/src/lib.rs
@@ -17,7 +17,7 @@ mod vfio_user;
 pub use self::bus::{PciBus, PciConfigIo, PciConfigMmio, PciRoot, PciRootError};
 pub use self::configuration::{
    PciBarConfiguration, PciBarPrefetchable, PciBarRegionType, PciCapability, PciCapabilityId,
-    PciClassCode, PciConfiguration, PciExpressCapabilityId, PciHeaderType, PciMassStorageSubclass,
+    PciClassCode, PciConfiguration, PciHeaderType, PciMassStorageSubclass,
    PciNetworkControllerSubclass, PciProgrammingInterface, PciSerialBusSubClass, PciSubclass,
 };
 pub use self::device::{
@@ -52,7 +52,7 @@ pub const PCI_CONFIG_IO_PORT: u64 = 0xcf8;
 #[cfg(target_arch = "x86_64")]
 pub const PCI_CONFIG_IO_PORT_SIZE: u64 = 0x8;

-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd)]
+#[derive(Clone, Copy, PartialEq, PartialOrd)]
 pub struct PciBdf(u32);

 struct PciBdfVisitor;
--- a/pci/src/msi.rs
+++ b/pci/src/msi.rs
@@ -3,17 +3,11 @@
 // SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
 //

-use anyhow::anyhow;
 use byteorder::{ByteOrder, LittleEndian};
-use std::io;
 use std::sync::Arc;
-use thiserror::Error;
-use versionize::{VersionMap, Versionize, VersionizeResult};
-use versionize_derive::Versionize;
 use vm_device::interrupt::{
    InterruptIndex, InterruptSourceConfig, InterruptSourceGroup, MsiIrqSourceConfig,
 };
-use vm_migration::{MigratableError, Pausable, Snapshot, Snapshottable, VersionMapped};

 // MSI control masks
 const MSI_CTL_ENABLE: u16 = 0x1;
@@ -38,15 +32,7 @@ pub fn msi_num_enabled_vectors(msg_ctl: u16) -> usize {
    1 << field
 }

-#[derive(Error, Debug)]
-enum Error {
-    #[error("Failed enabling the interrupt route: {0}")]
-    EnableInterruptRoute(io::Error),
-    #[error("Failed updating the interrupt route: {0}")]
-    UpdateInterruptRoute(io::Error),
-}
-
-#[derive(Clone, Copy, Default, Versionize)]
+#[derive(Clone, Copy, Default)]
 pub struct MsiCap {
    // Message Control Register
    //   0:     MSI enable.
@@ -171,15 +157,8 @@ impl MsiCap {
    }
 }

-#[derive(Versionize)]
-struct MsiConfigState {
-    cap: MsiCap,
-}
-
-impl VersionMapped for MsiConfigState {}
-
 pub struct MsiConfig {
-    pub cap: MsiCap,
+    cap: MsiCap,
    interrupt_source_group: Arc<dyn InterruptSourceGroup>,
 }

@@ -196,39 +175,6 @@ impl MsiConfig {
        }
    }

-    fn state(&self) -> MsiConfigState {
-        MsiConfigState { cap: self.cap }
-    }
-
-    fn set_state(&mut self, state: &MsiConfigState) -> Result<(), Error> {
-        self.cap = state.cap;
-
-        if self.enabled() {
-            for idx in 0..self.num_enabled_vectors() {
-                let config = MsiIrqSourceConfig {
-                    high_addr: self.cap.msg_addr_hi,
-                    low_addr: self.cap.msg_addr_lo,
-                    data: self.cap.msg_data as u32,
-                    devid: 0,
-                };
-
-                self.interrupt_source_group
-                    .update(
-                        idx as InterruptIndex,
-                        InterruptSourceConfig::MsiIrq(config),
-                        self.cap.vector_masked(idx),
-                    )
-                    .map_err(Error::UpdateInterruptRoute)?;
-            }
-
-            self.interrupt_source_group
-                .enable()
-                .map_err(Error::EnableInterruptRoute)?;
-        }
-
-        Ok(())
-    }
-
    pub fn enabled(&self) -> bool {
        self.cap.enabled()
    }
@@ -276,26 +222,3 @@ impl MsiConfig {
        }
    }
 }
-
-impl Pausable for MsiConfig {}
-
-impl Snapshottable for MsiConfig {
-    fn id(&self) -> String {
-        String::from("msi_config")
-    }
-
-    fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
-        Snapshot::new_from_versioned_state(&self.id(), &self.state())
-    }
-
-    fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
-        self.set_state(&snapshot.to_versioned_state(&self.id())?)
-            .map_err(|e| {
-                MigratableError::Restore(anyhow!(
-                    "Could not restore state for {}: {:?}",
-                    self.id(),
-                    e
-                ))
-            })
-    }
-}
--- a/pci/src/msix.rs
+++ b/pci/src/msix.rs
@@ -441,7 +441,7 @@ impl Snapshottable for MsixConfig {

 #[allow(dead_code)]
 #[repr(packed)]
-#[derive(Clone, Copy, Default, Versionize)]
+#[derive(Clone, Copy, Default)]
 pub struct MsixCap {
    // Message Control Register
    //   10-0:  MSI-X Table size
--- a/pci/src/vfio.rs
+++ b/pci/src/vfio.rs
--- a/pci/src/vfio_user.rs
+++ b/pci/src/vfio_user.rs
@@ -3,15 +3,13 @@
 // SPDX-License-Identifier: Apache-2.0
 //

-use crate::vfio::{Interrupt, UserMemoryRegion, Vfio, VfioCommon, VfioError};
-use crate::{BarReprogrammingParams, PciBarConfiguration, VfioPciError};
+use crate::vfio::{Interrupt, Vfio, VfioCommon, VfioError};
+use crate::{BarReprogrammingParams, PciBarRegionType, VfioPciError};
 use crate::{
    PciBdf, PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciHeaderType, PciSubclass,
 };
-use anyhow::anyhow;
 use hypervisor::HypervisorVmError;
 use std::any::Any;
-use std::collections::HashMap;
 use std::os::unix::prelude::AsRawFd;
 use std::ptr::null_mut;
 use std::sync::{Arc, Barrier, Mutex};
@@ -23,20 +21,19 @@ use vfio_user::{Client, Error as VfioUserError};
 use vm_allocator::{AddressAllocator, SystemAllocator};
 use vm_device::dma_mapping::ExternalDmaMapping;
 use vm_device::interrupt::{InterruptManager, InterruptSourceGroup, MsiIrqGroupConfig};
-use vm_device::{BusDevice, Resource};
+use vm_device::BusDevice;
 use vm_memory::bitmap::AtomicBitmap;
 use vm_memory::{
    Address, GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryRegion, GuestRegionMmap,
+    GuestUsize,
 };
-use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
 use vmm_sys_util::eventfd::EventFd;

 pub struct VfioUserPciDevice {
-    id: String,
    vm: Arc<dyn hypervisor::Vm>,
    client: Arc<Mutex<Client>>,
+    vfio_wrapper: VfioUserClientWrapper,
    common: VfioCommon,
-    memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
 }

 #[derive(Error, Debug)]
@@ -65,16 +62,12 @@ impl PciSubclass for PciVfioUserSubclass {
 }

 impl VfioUserPciDevice {
-    #[allow(clippy::too_many_arguments)]
    pub fn new(
-        id: String,
        vm: &Arc<dyn hypervisor::Vm>,
        client: Arc<Mutex<Client>>,
-        msi_interrupt_manager: Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
+        msi_interrupt_manager: &Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
        legacy_interrupt_group: Option<Arc<dyn InterruptSourceGroup>>,
        bdf: PciBdf,
-        restoring: bool,
-        memory_slot: Arc<dyn Fn() -> u32 + Send + Sync>,
    ) -> Result<Self, VfioUserPciDeviceError> {
        // This is used for the BAR and capabilities only
        let configuration = PciConfiguration::new(
@@ -110,32 +103,29 @@ impl VfioUserPciDevice {
                msi: None,
                msix: None,
            },
-            msi_interrupt_manager,
-            legacy_interrupt_group,
-            vfio_wrapper: Arc::new(vfio_wrapper) as Arc<dyn Vfio>,
-            patches: HashMap::new(),
        };

-        // No need to parse capabilities from the device if on the restore path.
-        // The initialization will be performed later when restore() will be
-        // called.
-        if !restoring {
-            common.parse_capabilities(bdf);
-            common
-                .initialize_legacy_interrupt()
-                .map_err(VfioUserPciDeviceError::InitializeLegacyInterrupts)?;
-        }
+        common.parse_capabilities(msi_interrupt_manager, &vfio_wrapper, bdf);
+        common
+            .initialize_legacy_interrupt(legacy_interrupt_group, &vfio_wrapper)
+            .map_err(VfioUserPciDeviceError::InitializeLegacyInterrupts)?;

        Ok(Self {
-            id,
            vm: vm.clone(),
            client,
+            vfio_wrapper,
            common,
-            memory_slot,
        })
    }

-    pub fn map_mmio_regions(&mut self) -> Result<(), VfioUserPciDeviceError> {
+    pub fn map_mmio_regions<F>(
+        &mut self,
+        vm: &Arc<dyn hypervisor::Vm>,
+        mem_slot: F,
+    ) -> Result<(), VfioUserPciDeviceError>
+    where
+        F: Fn() -> u32,
+    {
        for mmio_region in &mut self.common.mmio_regions {
            let region_flags = self
                .client
@@ -153,15 +143,6 @@ impl VfioUserPciDevice {
                .file_offset
                .clone();

-            let sparse_areas = self
-                .client
-                .lock()
-                .unwrap()
-                .region(mmio_region.index)
-                .unwrap()
-                .sparse_areas
-                .clone();
-
            if region_flags & VFIO_REGION_INFO_FLAG_MMAP != 0 {
                let mut prot = 0;
                if region_flags & VFIO_REGION_INFO_FLAG_READ != 0 {
@@ -171,58 +152,41 @@ impl VfioUserPciDevice {
                    prot |= libc::PROT_WRITE;
                }

-                let mmaps = if sparse_areas.is_empty() {
-                    vec![vfio_region_sparse_mmap_area {
-                        offset: 0,
-                        size: mmio_region.length,
-                    }]
-                } else {
-                    sparse_areas
+                let host_addr = unsafe {
+                    libc::mmap(
+                        null_mut(),
+                        mmio_region.length as usize,
+                        prot,
+                        libc::MAP_SHARED,
+                        file_offset.as_ref().unwrap().file().as_raw_fd(),
+                        file_offset.as_ref().unwrap().start() as libc::off_t,
+                    )
                };

-                for s in mmaps.iter() {
-                    let host_addr = unsafe {
-                        libc::mmap(
-                            null_mut(),
-                            s.size as usize,
-                            prot,
-                            libc::MAP_SHARED,
-                            file_offset.as_ref().unwrap().file().as_raw_fd(),
-                            file_offset.as_ref().unwrap().start() as libc::off_t
-                                + s.offset as libc::off_t,
-                        )
-                    };
-
-                    if host_addr == libc::MAP_FAILED {
-                        error!(
-                            "Could not mmap regions, error:{}",
-                            std::io::Error::last_os_error()
-                        );
-                        continue;
-                    }
-
-                    let user_memory_region = UserMemoryRegion {
-                        slot: (self.memory_slot)(),
-                        start: mmio_region.start.0 + s.offset,
-                        size: s.size,
-                        host_addr: host_addr as u64,
-                    };
-
-                    mmio_region.user_memory_regions.push(user_memory_region);
-
-                    let mem_region = self.vm.make_user_memory_region(
-                        user_memory_region.slot,
-                        user_memory_region.start,
-                        user_memory_region.size,
-                        user_memory_region.host_addr,
-                        false,
-                        false,
+                if host_addr == libc::MAP_FAILED {
+                    error!(
+                        "Could not mmap regions, error:{}",
+                        std::io::Error::last_os_error()
                    );
-
-                    self.vm
-                        .create_user_memory_region(mem_region)
-                        .map_err(VfioUserPciDeviceError::MapRegionGuest)?;
+                    continue;
                }
+
+                let slot = mem_slot();
+                let mem_region = vm.make_user_memory_region(
+                    slot,
+                    mmio_region.start.0,
+                    mmio_region.length as u64,
+                    host_addr as u64,
+                    false,
+                    false,
+                );
+
+                vm.create_user_memory_region(mem_region)
+                    .map_err(VfioUserPciDeviceError::MapRegionGuest)?;
+
+                mmio_region.mem_slot = Some(slot);
+                mmio_region.host_addr = Some(host_addr as u64);
+                mmio_region.mmap_size = Some(mmio_region.length as usize);
            }
        }

@@ -231,13 +195,17 @@ impl VfioUserPciDevice {

    pub fn unmap_mmio_regions(&mut self) {
        for mmio_region in self.common.mmio_regions.iter() {
-            for user_memory_region in mmio_region.user_memory_regions.iter() {
+            if let (Some(host_addr), Some(mmap_size), Some(mem_slot)) = (
+                mmio_region.host_addr,
+                mmio_region.mmap_size,
+                mmio_region.mem_slot,
+            ) {
                // Remove region
                let r = self.vm.make_user_memory_region(
-                    user_memory_region.slot,
-                    user_memory_region.start,
-                    user_memory_region.size,
-                    user_memory_region.host_addr,
+                    mem_slot,
+                    mmio_region.start.raw_value(),
+                    mmap_size as u64,
+                    host_addr as u64,
                    false,
                    false,
                );
@@ -246,13 +214,7 @@ impl VfioUserPciDevice {
                    error!("Could not remove the userspace memory region: {}", e);
                }

-                // Remove mmaps
-                let ret = unsafe {
-                    libc::munmap(
-                        user_memory_region.host_addr as *mut libc::c_void,
-                        user_memory_region.size as usize,
-                    )
-                };
+                let ret = unsafe { libc::munmap(host_addr as *mut libc::c_void, mmap_size) };
                if ret != 0 {
                    error!(
                        "Could not unmap region {}, error:{}",
@@ -430,10 +392,9 @@ impl PciDevice for VfioUserPciDevice {
        &mut self,
        allocator: &Arc<Mutex<SystemAllocator>>,
        mmio_allocator: &mut AddressAllocator,
-        resources: Option<Vec<Resource>>,
-    ) -> Result<Vec<PciBarConfiguration>, PciDeviceError> {
+    ) -> Result<Vec<(GuestAddress, GuestUsize, PciBarRegionType)>, PciDeviceError> {
        self.common
-            .allocate_bars(allocator, mmio_allocator, resources)
+            .allocate_bars(allocator, mmio_allocator, &self.vfio_wrapper)
    }

    fn free_bars(
@@ -464,19 +425,22 @@ impl PciDevice for VfioUserPciDevice {
        offset: u64,
        data: &[u8],
    ) -> Option<Arc<Barrier>> {
-        self.common.write_config_register(reg_idx, offset, data)
+        self.common
+            .write_config_register(reg_idx, offset, data, &self.vfio_wrapper)
    }

    fn read_config_register(&mut self, reg_idx: usize) -> u32 {
-        self.common.read_config_register(reg_idx)
+        self.common
+            .read_config_register(reg_idx, &self.vfio_wrapper)
    }

    fn read_bar(&mut self, base: u64, offset: u64, data: &mut [u8]) {
-        self.common.read_bar(base, offset, data)
+        self.common.read_bar(base, offset, data, &self.vfio_wrapper)
    }

    fn write_bar(&mut self, base: u64, offset: u64, data: &[u8]) -> Option<Arc<Barrier>> {
-        self.common.write_bar(base, offset, data)
+        self.common
+            .write_bar(base, offset, data, &self.vfio_wrapper)
    }

    fn move_bar(&mut self, old_base: u64, new_base: u64) -> Result<(), std::io::Error> {
@@ -485,41 +449,35 @@ impl PciDevice for VfioUserPciDevice {
            if mmio_region.start.raw_value() == old_base {
                mmio_region.start = GuestAddress(new_base);

-                for user_memory_region in mmio_region.user_memory_regions.iter_mut() {
-                    // Remove old region
-                    let old_region = self.vm.make_user_memory_region(
-                        user_memory_region.slot,
-                        user_memory_region.start,
-                        user_memory_region.size,
-                        user_memory_region.host_addr,
-                        false,
-                        false,
-                    );
+                if let Some(mem_slot) = mmio_region.mem_slot {
+                    if let Some(host_addr) = mmio_region.host_addr {
+                        // Remove original region
+                        let old_region = self.vm.make_user_memory_region(
+                            mem_slot,
+                            old_base,
+                            mmio_region.length as u64,
+                            host_addr as u64,
+                            false,
+                            false,
+                        );

-                    self.vm
-                        .remove_user_memory_region(old_region)
-                        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
+                        self.vm
+                            .remove_user_memory_region(old_region)
+                            .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;

-                    // Update the user memory region with the correct start address.
-                    if new_base > old_base {
-                        user_memory_region.start += new_base - old_base;
-                    } else {
-                        user_memory_region.start -= old_base - new_base;
+                        let new_region = self.vm.make_user_memory_region(
+                            mem_slot,
+                            new_base,
+                            mmio_region.length as u64,
+                            host_addr as u64,
+                            false,
+                            false,
+                        );
+
+                        self.vm
+                            .create_user_memory_region(new_region)
+                            .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
                    }
-
-                    // Insert new region
-                    let new_region = self.vm.make_user_memory_region(
-                        user_memory_region.slot,
-                        user_memory_region.start,
-                        user_memory_region.size,
-                        user_memory_region.host_addr,
-                        false,
-                        false,
-                    );
-
-                    self.vm
-                        .create_user_memory_region(new_region)
-                        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
                }
                info!("Moved bar 0x{:x} -> 0x{:x}", old_base, new_base);
            }
@@ -527,10 +485,6 @@ impl PciDevice for VfioUserPciDevice {

        Ok(())
    }
-
-    fn id(&self) -> Option<String> {
-        Some(self.id.clone())
-    }
 }

 impl Drop for VfioUserPciDevice {
@@ -539,18 +493,18 @@ impl Drop for VfioUserPciDevice {

        if let Some(msix) = &self.common.interrupt.msix {
            if msix.bar.enabled() {
-                self.common.disable_msix();
+                self.common.disable_msix(&self.vfio_wrapper);
            }
        }

        if let Some(msi) = &self.common.interrupt.msi {
            if msi.cfg.enabled() {
-                self.common.disable_msi()
+                self.common.disable_msi(&self.vfio_wrapper)
            }
        }

        if self.common.interrupt.intx_in_use() {
-            self.common.disable_intx();
+            self.common.disable_intx(&self.vfio_wrapper);
        }

        if let Err(e) = self.client.lock().unwrap().shutdown() {
@@ -559,40 +513,6 @@ impl Drop for VfioUserPciDevice {
    }
 }

-impl Pausable for VfioUserPciDevice {}
-
-impl Snapshottable for VfioUserPciDevice {
-    fn id(&self) -> String {
-        self.id.clone()
-    }
-
-    fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
-        let mut vfio_pci_dev_snapshot = Snapshot::new(&self.id);
-
-        // Snapshot VfioCommon
-        vfio_pci_dev_snapshot.add_snapshot(self.common.snapshot()?);
-
-        Ok(vfio_pci_dev_snapshot)
-    }
-
-    fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
-        // Restore VfioCommon
-        if let Some(vfio_common_snapshot) = snapshot.snapshots.get(&self.common.id()) {
-            self.common.restore(*vfio_common_snapshot.clone())?;
-            self.map_mmio_regions().map_err(|e| {
-                MigratableError::Restore(anyhow!(
-                    "Could not map MMIO regions for VfioUserPciDevice on restore {:?}",
-                    e
-                ))
-            })?;
-        }
-
-        Ok(())
-    }
-}
-impl Transportable for VfioUserPciDevice {}
-impl Migratable for VfioUserPciDevice {}
-
 pub struct VfioUserDmaMapping<M: GuestAddressSpace> {
    client: Arc<Mutex<Client>>,
    memory: Arc<M>,
@@ -626,10 +546,10 @@ impl<M: GuestAddressSpace + Sync + Send> ExternalDmaMapping for VfioUserDmaMappi
                    )
                })
        } else {
-            Err(std::io::Error::new(
+            return Err(std::io::Error::new(
                std::io::ErrorKind::Other,
                format!("Region not found for 0x{:x}", gpa),
-            ))
+            ));
        }
    }

--- a/performance-metrics/Cargo.toml
+++ b/performance-metrics/Cargo.toml
@@ -6,13 +6,14 @@ edition = "2021"
 build = "build.rs"

 [dependencies]
-clap = { version = "3.2.17", features = ["wrap_help","cargo"] }
+clap = { version = "3.1.8", features = ["wrap_help","cargo"] }
 dirs = "4.0.0"
-serde = { version = "1.0.143", features = ["rc", "derive"] }
-serde_json = "1.0.83"
+serde = { version = "1.0.136", features = ["rc"] }
+serde_derive = "1.0.136"
+serde_json = "1.0.78"
 test_infra = { path = "../test_infra" }
-thiserror = "1.0.32"
+thiserror = "1.0.30"
 wait-timeout = "0.2.0"

 [build-dependencies]
-clap = { version = "3.2.17", features = ["cargo"] }
+clap = { version = "3.1.8", features = ["cargo"] }
--- a/performance-metrics/src/main.rs
+++ b/performance-metrics/src/main.rs
@@ -12,14 +12,8 @@ mod performance_tests;

 use clap::{Arg, Command as ClapCommand};
 use performance_tests::*;
-use serde::{Deserialize, Serialize};
-use std::{
-    env, fmt,
-    process::Command,
-    sync::{mpsc::channel, Arc},
-    thread,
-    time::Duration,
-};
+use serde_derive::{Deserialize, Serialize};
+use std::{env, fmt, process::Command, sync::mpsc::channel, thread, time::Duration};
 use thiserror::Error;

 #[derive(Error, Debug)]
@@ -53,30 +47,18 @@ impl Default for MetricsReport {
        let mut git_human_readable = "".to_string();
        if let Ok(git_out) = Command::new("git").args(&["describe", "--dirty"]).output() {
            if git_out.status.success() {
-                git_human_readable = String::from_utf8(git_out.stdout)
-                    .unwrap()
-                    .trim()
-                    .to_string();
-            } else {
-                eprintln!(
-                    "Error generating human readable git reference: {}",
-                    String::from_utf8(git_out.stderr).unwrap()
-                );
+                if let Ok(git_out_str) = String::from_utf8(git_out.stdout) {
+                    git_human_readable = git_out_str.trim().to_string();
+                }
            }
        }

        let mut git_revision = "".to_string();
        if let Ok(git_out) = Command::new("git").args(&["rev-parse", "HEAD"]).output() {
            if git_out.status.success() {
-                git_revision = String::from_utf8(git_out.stdout)
-                    .unwrap()
-                    .trim()
-                    .to_string();
-            } else {
-                eprintln!(
-                    "Error generating git reference: {}",
-                    String::from_utf8(git_out.stderr).unwrap()
-                );
+                if let Ok(git_out_str) = String::from_utf8(git_out.stdout) {
+                    git_revision = git_out_str.trim().to_string();
+                }
            }
        }

@@ -86,15 +68,9 @@ impl Default for MetricsReport {
            .output()
        {
            if git_out.status.success() {
-                git_commit_date = String::from_utf8(git_out.stdout)
-                    .unwrap()
-                    .trim()
-                    .to_string();
-            } else {
-                eprintln!(
-                    "Error generating git commit date: {}",
-                    String::from_utf8(git_out.stderr).unwrap()
-                );
+                if let Ok(git_out_str) = String::from_utf8(git_out.stdout) {
+                    git_commit_date = git_out_str.trim().to_string();
+                }
            }
        }

@@ -108,21 +84,6 @@ impl Default for MetricsReport {
    }
 }

-#[derive(Default)]
-pub struct PerformanceTestOverrides {
-    test_iterations: Option<u32>,
-}
-
-impl fmt::Display for PerformanceTestOverrides {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        if let Some(test_iterations) = self.test_iterations {
-            write!(f, "test_iterations = {}", test_iterations)?;
-        }
-
-        Ok(())
-    }
-}
-
 pub struct PerformanceTestControl {
    test_timeout: u32,
    test_iterations: u32,
@@ -130,7 +91,6 @@ pub struct PerformanceTestControl {
    queue_size: Option<u32>,
    net_rx: Option<bool>,
    fio_ops: Option<FioOps>,
-    num_boot_vcpus: Option<u8>,
 }

 impl fmt::Display for PerformanceTestControl {
@@ -165,7 +125,6 @@ impl PerformanceTestControl {
            queue_size: None,
            net_rx: None,
            fio_ops: None,
-            num_boot_vcpus: Some(1),
        }
    }
 }
@@ -181,12 +140,9 @@ struct PerformanceTest {
 }

 impl PerformanceTest {
-    pub fn run(&self, overrides: &PerformanceTestOverrides) -> PerformanceTestResult {
+    pub fn run(&self) -> PerformanceTestResult {
        let mut metrics = Vec::new();
-        for _ in 0..overrides
-            .test_iterations
-            .unwrap_or(self.control.test_iterations)
-        {
+        for _ in 0..self.control.test_iterations {
            metrics.push((self.func_ptr)(&self.control));
        }

@@ -206,9 +162,8 @@ impl PerformanceTest {

    // Calculate the timeout for each test
    // Note: To cover the setup/cleanup time, 20s is added for each iteration of the test
-    pub fn calc_timeout(&self, test_iterations: &Option<u32>) -> u64 {
-        ((self.control.test_timeout + 20) * test_iterations.unwrap_or(self.control.test_iterations))
-            as u64
+    pub fn calc_timeout(&self) -> u64 {
+        ((self.control.test_timeout + 20) * self.control.test_iterations) as u64
    }
 }

@@ -261,7 +216,7 @@ mod adjuster {
    }
 }

-const TEST_LIST: [PerformanceTest; 17] = [
+const TEST_LIST: [PerformanceTest; 15] = [
    PerformanceTest {
        name: "boot_time_ms",
        func_ptr: performance_boot_time,
@@ -282,28 +237,6 @@ const TEST_LIST: [PerformanceTest; 17] = [
        },
        unit_adjuster: adjuster::s_to_ms,
    },
-    PerformanceTest {
-        name: "boot_time_16_vcpus_ms",
-        func_ptr: performance_boot_time,
-        control: PerformanceTestControl {
-            test_timeout: 2,
-            test_iterations: 10,
-            num_boot_vcpus: Some(16),
-            ..PerformanceTestControl::default()
-        },
-        unit_adjuster: adjuster::s_to_ms,
-    },
-    PerformanceTest {
-        name: "boot_time_16_vcpus_pmem_ms",
-        func_ptr: performance_boot_time_pmem,
-        control: PerformanceTestControl {
-            test_timeout: 2,
-            test_iterations: 10,
-            num_boot_vcpus: Some(16),
-            ..PerformanceTestControl::default()
-        },
-        unit_adjuster: adjuster::s_to_ms,
-    },
    PerformanceTest {
        name: "virtio_net_latency_us",
        func_ptr: performance_net_latency,
@@ -448,20 +381,12 @@ const TEST_LIST: [PerformanceTest; 17] = [
    },
 ];

-fn run_test_with_timeout(
-    test: &'static PerformanceTest,
-    overrides: &Arc<PerformanceTestOverrides>,
-) -> Result<PerformanceTestResult, Error> {
+fn run_test_with_timeout(test: &'static PerformanceTest) -> Result<PerformanceTestResult, Error> {
    let (sender, receiver) = channel::<Result<PerformanceTestResult, Error>>();
-    let test_iterations = overrides.test_iterations;
-    let overrides = overrides.clone();
    thread::spawn(move || {
-        println!(
-            "Test '{}' running .. (control: {}, overrides: {})",
-            test.name, test.control, overrides
-        );
+        println!("Test '{}' running .. ({})", test.name, test.control);

-        let output = match std::panic::catch_unwind(|| test.run(&overrides)) {
+        let output = match std::panic::catch_unwind(|| test.run()) {
            Ok(test_result) => {
                println!(
                    "Test '{}' .. ok: mean = {}, std_dev = {}",
@@ -476,7 +401,7 @@ fn run_test_with_timeout(
    });

    // Todo: Need to cleanup/kill all hanging child processes
-    let test_timeout = test.calc_timeout(&test_iterations);
+    let test_timeout = test.calc_timeout();
    receiver
        .recv_timeout(Duration::from_secs(test_timeout))
        .map_err(|_| {
@@ -520,12 +445,6 @@ fn main() {
                .help("Report file. Standard error is used if not specified")
                .takes_value(true),
        )
-        .arg(
-            Arg::new("iterations")
-                .long("iterations")
-                .help("Override number of test iterations")
-                .takes_value(true),
-        )
        .get_matches();

    // It seems that the tool (ethr) used for testing the virtio-net latency
@@ -554,17 +473,9 @@ fn main() {

    init_tests();

-    let overrides = Arc::new(PerformanceTestOverrides {
-        test_iterations: cmd_arguments
-            .value_of("iterations")
-            .map(|s| s.parse())
-            .transpose()
-            .unwrap_or_default(),
-    });
-
    for test in test_list.iter() {
        if test_filter.is_empty() || test_filter.iter().any(|&s| test.name.contains(s)) {
-            match run_test_with_timeout(test, &overrides) {
+            match run_test_with_timeout(test) {
                Ok(r) => {
                    metrics_report.results.push(r);
                }
--- a/performance-metrics/src/performance_tests.rs
+++ b/performance-metrics/src/performance_tests.rs
@@ -238,7 +238,6 @@ pub fn performance_net_throughput(control: &PerformanceTestControl) -> f64 {
        .default_disks()
        .args(&["--net", net_params.as_str()])
        .capture_output()
-        .verbosity(VerbosityLevel::Warn)
        .set_print_cmd(false)
        .spawn()
        .unwrap();
@@ -312,7 +311,7 @@ fn measure_virtio_net_latency(guest: &Guest, test_timeout: u32) -> Result<Vec<f6
        .ssh_command(&format!("{} -s &> /dev/null &", ethr_remote_path))
        .map_err(InfraError::SshCommand)?;

-    thread::sleep(Duration::new(10, 0));
+    thread::sleep(Duration::new(1, 0));

    // Start the ethr client on the host
    let log_file = guest
@@ -368,7 +367,6 @@ pub fn performance_net_latency(control: &PerformanceTestControl) -> f64 {
        .default_disks()
        .args(&["--net", net_params.as_str()])
        .capture_output()
-        .verbosity(VerbosityLevel::Warn)
        .set_print_cmd(false)
        .spawn()
        .unwrap();
@@ -474,12 +472,7 @@ fn parse_boot_time_output(output: &[u8]) -> Result<f64, Error> {
 }

 fn measure_boot_time(cmd: &mut GuestCommand, test_timeout: u32) -> Result<f64, Error> {
-    let mut child = cmd
-        .capture_output()
-        .verbosity(VerbosityLevel::Warn)
-        .set_print_cmd(false)
-        .spawn()
-        .unwrap();
+    let mut child = cmd.capture_output().set_print_cmd(false).spawn().unwrap();

    thread::sleep(Duration::new(test_timeout as u64, 0));
    let _ = child.kill();
@@ -506,10 +499,6 @@ pub fn performance_boot_time(control: &PerformanceTestControl) -> f64 {
        let mut cmd = GuestCommand::new(&guest);

        let c = cmd
-            .args(&[
-                "--cpus",
-                &format!("boot={}", control.num_boot_vcpus.unwrap_or(1)),
-            ])
            .args(&["--memory", "size=1G"])
            .args(&["--kernel", direct_kernel_boot_path().to_str().unwrap()])
            .args(&["--cmdline", DIRECT_KERNEL_BOOT_CMDLINE])
@@ -533,10 +522,6 @@ pub fn performance_boot_time_pmem(control: &PerformanceTestControl) -> f64 {
        let guest = performance_test_new_guest(Box::new(focal));
        let mut cmd = GuestCommand::new(&guest);
        let c = cmd
-            .args(&[
-                "--cpus",
-                &format!("boot={}", control.num_boot_vcpus.unwrap_or(1)),
-            ])
            .args(&["--memory", "size=1G,hugepages=on"])
            .args(&["--kernel", direct_kernel_boot_path().to_str().unwrap()])
            .args(&["--cmdline", "root=/dev/pmem0p1 console=ttyS0 quiet rw"])
@@ -670,7 +655,6 @@ pub fn performance_block_io(control: &PerformanceTestControl) -> f64 {
        .default_net()
        .args(&["--api-socket", &api_socket])
        .capture_output()
-        .verbosity(VerbosityLevel::Warn)
        .set_print_cmd(false)
        .spawn()
        .unwrap();
--- a/qcow/Cargo.toml
+++ b/qcow/Cargo.toml
@@ -10,7 +10,7 @@ path = "src/qcow.rs"

 [dependencies]
 byteorder = "1.4.3"
-libc = "0.2.131"
-log = "0.4.17"
-remain = "0.2.4"
-vmm-sys-util = "0.10.0"
+libc = "0.2.123"
+log = "0.4.16"
+remain = "0.2.2"
+vmm-sys-util = "0.9.0"
--- a/qcow/src/qcow.rs
+++ b/qcow/src/qcow.rs
@@ -516,19 +516,6 @@ impl QcowFile {

        let l2_entries = cluster_size / size_of::<u64>() as u64;

-        // Check for compressed blocks
-        for l2_addr_disk in l1_table.get_values() {
-            if *l2_addr_disk != 0 {
-                if let Err(e) = Self::read_l2_cluster(&mut raw_file, *l2_addr_disk) {
-                    if let Some(os_error) = e.raw_os_error() {
-                        if os_error == ENOTSUP {
-                            return Err(Error::CompressedBlocksNotSupported);
-                        }
-                    }
-                }
-            }
-        }
-
        let mut qcow = QcowFile {
            raw_file,
            header,
@@ -1487,11 +1474,16 @@ impl Write for QcowFile {
            let offset = self.file_offset_write(curr_addr)?;
            let count = self.limit_range_cluster(curr_addr, write_count - nwritten);

-            self.raw_file.file_mut().seek(SeekFrom::Start(offset))?;
-            let count = self
+            if let Err(e) = self.raw_file.file_mut().seek(SeekFrom::Start(offset)) {
+                return Err(e);
+            }
+            if let Err(e) = self
                .raw_file
                .file_mut()
-                .write(&buf[nwritten..(nwritten + count)])?;
+                .write(&buf[nwritten..(nwritten + count)])
+            {
+                return Err(e);
+            }

            nwritten += count;
        }
--- a/rate_limiter/Cargo.toml
+++ b/rate_limiter/Cargo.toml
@@ -4,6 +4,6 @@ version = "0.1.0"
 edition = "2021"

 [dependencies]
-libc = "0.2.131"
-log = "0.4.17"
-vmm-sys-util = "0.10.0"
+libc = "0.2.123"
+log = "0.4.16"
+vmm-sys-util = "0.9.0"
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Rob Bradford	479fef1b8e	build: Release v23.1 (bug fix release) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
Bo Chen	fc8f867879	vmm: Add 'shutdown()' to vCPU seccomp filter This is required when hot-removing a vfio-user device. Details code path below: Thread 6 "vcpu0" received signal SIGSYS, Bad system call. [Switching to Thread 0x7f8196889700 (LWP 2358305)] 0x00007f8196dae7ab in shutdown () at ../sysdeps/unix/syscall-template.S:78 78 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) (gdb) bt 0x00007f8196dae7ab in shutdown () at ../sysdeps/unix/syscall-template.S:78 0x000056189240737d in std::sys::unix::net::Socket::shutdown () at library/std/src/sys/unix/net.rs:383 std::os::unix::net::stream::UnixStream::shutdown () at library/std/src/os/unix/net/stream.rs:479 0x000056189210e23d in vfio_user::Client::shutdown (self=0x7f8190014300) at vfio_user/src/lib.rs:787 0x00005618920b9d02 in <pci::vfio_user::VfioUserPciDevice as core::ops::drop::Drop>::drop ( self=0x7f819002d7c0) at pci/src/vfio_user.rs:551 0x00005618920b8787 in core::ptr::drop_in_place<pci::vfio_user::VfioUserPciDevice> () at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ptr/mod.rs:188 0x00005618920b92e3 in core::ptr::drop_in_place<core::cell::UnsafeCell<dyn pci::device::PciDevice>> () at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ptr/mod.rs:188 0x00005618920b9362 in core::ptr::drop_in_place<std::sync::mutex::Mutex<dyn pci::device::PciDevice>> () at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ptr/mod.rs:188 0x00005618920d8a3e in alloc::sync::Arc<T>::drop_slow (self=0x7f81968852b8) at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/alloc/src/sync.rs:1092 0x00005618920ba273 in <alloc::sync::Arc<T> as core::ops::drop::Drop>::drop (self=0x7f81968852b8) at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/alloc/src/sync.rs:1688 0x00005618920b76fb in core::ptr::drop_in_place<alloc::sync::Arc<std::sync::mutex::Mutex<dyn pci::device::PciDevice>>> () at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ptr/mod.rs:188 0x0000561891b5e47d in vmm::device_manager::DeviceManager::eject_device (self=0x7f8190009600, pci_segment_id=0, device_id=3) at vmm/src/device_manager.rs:4000 0x0000561891b674bc in <vmm::device_manager::DeviceManager as vm_device::bus::BusDevice>::write ( self=0x7f8190009600, base=70368744108032, offset=8, data=&[u8](size=4) = {...}) at vmm/src/device_manager.rs:4625 0x00005618921927d5 in vm_device::bus::Bus::write (self=0x7f8190006e00, addr=70368744108040, data=&[u8](size=4) = {...}) at vm-device/src/bus.rs:235 0x0000561891b72e10 in <vmm::vm::VmOps as hypervisor::vm::VmmOps>::mmio_write ( self=0x7f81900097b0, gpa=70368744108040, data=&[u8](size=4) = {...}) at vmm/src/vm.rs:378 0x0000561892133ae2 in <hypervisor::kvm::KvmVcpu as hypervisor::cpu::Vcpu>::run ( self=0x7f8190013c90) at hypervisor/src/kvm/mod.rs:1114 0x0000561891914e85 in vmm::cpu::Vcpu::run (self=0x7f819001b230) at vmm/src/cpu.rs:348 0x000056189189f2cb in vmm::cpu::CpuManager::start_vcpu::{{closure}}::{{closure}} () at vmm/src/cpu.rs:953 Signed-off-by: Bo Chen <chen.bo@intel.com> (cherry picked from commit `42c19e14c5`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
Sebastien Boeuf	e2eb59bcc8	vmm: Remove FsConfig from VmConfig when unplugging fs device All hotpluggable devices were properly removed from the VmConfig when a remove-device command was issued, except for the "fs" type. Fix this lack of support as it is causing the integration tests to fail with the recent addition of verifying that identifiers are unique. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com> (cherry picked from commit `a5a2e591c9`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
LiHui	1e557fdb3c	vmm: api: Do not delete the API socket on API server creation The socket will safely deleted on shutdown and so it is not necessary to delete the API socket when starting the HTTP server. Fixes: #4026 Signed-off-by: LiHui <andrewli@kubesphere.io> Signed-off-by: Rob Bradford <robert.bradford@intel.com> (cherry picked from commit `ec0c1b01c4`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
Rob Bradford	10ce348aa6	tests: Use different API sockets when restoring This prevents a conflict since the old API socket will not have been cleaned up (due to the use of SIGKILL.) Signed-off-by: Rob Bradford <robert.bradford@intel.com> (cherry picked from commit `4fed2d4ed7`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
Rob Bradford	63130d0f92	vmm: seccomp: Allow SYS_rseq as required by newer glibc glibc 2.35 as shipped by Fedora 36 now uses the rseq syscall. Signed-off-by: Rob Bradford <robert.bradford@intel.com> (cherry picked from commit `4a04d1f8f2`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
Rob Bradford	e6cc364703	virtio-devices: mem: Reject resize if device not activated by guest If the guest has not activated the virtio-mem device then reject an attempt to resize using it. Fixes: #4001 Signed-off-by: Rob Bradford <robert.bradford@intel.com> (cherry picked from commit `c274ce4d49`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00
Fabiano Fidêncio	a861918f06	docs: Fix the name of the I/O operations knobs The I/O operations knobs are prefixed `ops_` rather than `bw_`, as `bw_` refers to the "bandwidth" knobs. Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com> (cherry picked from commit `a87d1bbaa1`) Signed-off-by: Rob Bradford <robert.bradford@intel.com>	2022-05-09 14:54:18 +01:00