build: Initial musl support

Fix all build failures and add musl to the gihub workflows.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

.github/workflows/build.yaml

@@ -12,6 +12,9 @@ jobs:
           - stable
           - beta
           - nightly
+        target:
+          - x86_64-unknown-linux-gnu
+          - x86_64-unknown-linux-musl
     steps:
       - name: Code checkout
         uses: actions/checkout@v2
@@ -19,7 +22,8 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
             toolchain: ${{ matrix.rust }}
+            target: ${{ matrix.target }}
             override: true
 
       - name: Build
-        run: cargo build --release
+        run: cargo build --release --target=${{ matrix.target }}

.github/workflows/release.yaml

@@ -9,13 +9,20 @@ jobs:
     steps:
       - name: Code checkout
         uses: actions/checkout@v2
-      - name: Install Rust toolchain (stable)
+      - name: Install Rust toolchain (x86_64-unknown-linux-gnu)
         uses: actions-rs/toolchain@v1
         with:
             toolchain: stable
-            override: true
+            target: x86_64-unknown-linux-gnu
+      - name: Install Rust toolchain (x86_64-unknown-linux-musl)
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: stable
+            target: x86_64-unknown-linux-musl
       - name: Build
-        run: cargo build --release
+        run: cargo build --release --target=x86_64-unknown-linux-gnu
+      - name: Static Build
+        run: cargo build --release --target=x86_64-unknown-linux-musl
       - name: Create Release
         id: create_release
         uses: actions/create-release@v1
@@ -33,9 +40,19 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: target/release/cloud-hypervisor
+          asset_path: target/x86_64-unknown-linux-gnu/release/cloud-hypervisor
           asset_name: cloud-hypervisor
           asset_content_type: application/octet-stream
+      - name: Upload static cloud-hypervisor
+        id: upload-release-static-cloud-hypervisor
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: target/x86_64-unknown-linux-musl/release/cloud-hypervisor
+          asset_name: cloud-hypervisor-static
+          asset_content_type: application/octet-stream
       - name: Upload ch-remote
         id: upload-release-ch-remote
         uses: actions/upload-release-asset@v1
@@ -43,6 +60,6 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: target/release/ch-remote
+          asset_path: target/x86_64-unknown-linux-gnu/release/ch-remote
           asset_name: ch-remote
           asset_content_type: application/octet-stream

vhost_user_fs/src/passthrough.rs

@@ -4,7 +4,6 @@
 
 use std::collections::btree_map;
 use std::collections::BTreeMap;
-use std::convert::TryInto;
 use std::ffi::{CStr, CString};
 use std::fs::File;
 use std::io;
@@ -1695,13 +1694,14 @@ impl FileSystem for PassthroughFs {
         // Safe because this will only modify `offset_in` and `offset_out` and we check
         // the return value.
         let res = unsafe {
-            libc::copy_file_range(
+            libc::syscall(
+                libc::SYS_copy_file_range,
                 fd_in,
                 &mut (offset_in as i64) as &mut _ as *mut _,
                 fd_out,
                 &mut (offset_out as i64) as &mut _ as *mut _,
-                len.try_into().unwrap(),
+                len,
-                flags.try_into().unwrap(),
+                flags,
             )
         };
         if res < 0 {

vmm/src/cpu.rs

@@ -671,7 +671,7 @@ impl VcpuState {
     fn signal_thread(&self) {
         if let Some(handle) = self.handle.as_ref() {
             unsafe {
-                libc::pthread_kill(handle.as_pthread_t(), SIGRTMIN());
+                libc::pthread_kill(handle.as_pthread_t() as _, SIGRTMIN());
             }
         }
     }