Extend the migration protocol with a `preserve_source` option so that a
source VM can be preserved. This benefits the snapshot case where the
offload daemon can now snapshot a VM without tearing it down.
Signed-off-by: Sebastien Boeuf <sboeuf@meta.com>
Assisted-by: Claude:claude-opus-4-8
For vhost-user devices, a snapshot involved the vrings to be stopped,
but they couldn't be resumed. This commit aims at fixing this by saving
the vrings base so that it can be safely reset after the snapshot has
succeeded.
This will allow VMs where snapshots are taken from internal CH
implementation and from an offload daemon to be resumed once the
snapshot is complete.
Signed-off-by: Sebastien Boeuf <sboeuf@meta.com>
Assisted-by: Claude:claude-opus-4-8
PR #8320 changed several endpoints to return 404 (Not Found) when the VM
has not been created yet, but the OpenAPI specification was not updated
to document these responses. Add the missing 404 entries for vm.info,
resize, resize-zone and the (cold) add-disk/device/pmem/net/vsock/vdpa
endpoints so the spec matches the implemented HTTP status codes.
Signed-off-by: Stepan Rabotkin <epicstyt@gmail.com>
Assisted-by: Claude:Opus-4.8
Bumps the rust-vmm group with 1 update in the / directory: [micro_http](https://github.com/firecracker-microvm/micro-http).
Bumps the rust-vmm group with 1 update in the /fuzz directory: [micro_http](https://github.com/firecracker-microvm/micro-http).
Updates `micro_http` from `5c2254d` to `876f3fe`
- [Commits](5c2254d6cf...876f3feccc)
Updates `micro_http` from `5c2254d` to `876f3fe`
- [Commits](5c2254d6cf...876f3feccc)
---
updated-dependencies:
- dependency-name: micro_http
dependency-version: 876f3feccc30e09225f2c77bf95a6b2d46a9259e
dependency-type: direct:production
dependency-group: rust-vmm
- dependency-name: micro_http
dependency-version: 876f3feccc30e09225f2c77bf95a6b2d46a9259e
dependency-type: direct:production
dependency-group: rust-vmm
...
Signed-off-by: dependabot[bot] <support@github.com>
Opening an issue and establishing agreement is now mandatory for
feature PRs. For bug fixes opening an issue if one does not already
exist may be beneficial.
Signed-off-by: Rob Bradford <rbradford@meta.com>
On `VM::boot` call, lock disks only after the state change has been
checked for validity. Otherwise, on invalid state change, boot is
aborted, but file locks aren't rolled back.
On-behalf-of: SAP julian.schindel@sap.com
Signed-off-by: Julian Schindel <julian.schindel@cyberus-technology.de>
Filtered activation queues can hide regressions where resume treats
their positions as transport queue indices. Such regressions route
interrupts to unrelated MSI-X vectors while eventfd notifications still
reach the correct workers.
Add a VirtioCommon regression test with queue indices one and three.
Verify resume signals both queue eventfds and records interrupts for the
original sparse indices.
Assisted-by: OpenAI:GPT-5.6-Sol
Signed-off-by: Yi Wang <foxywang@tencent.com>
VirtioCommon stores only activated queue eventfds, so filtered queues
are renumbered when resume injects interrupts. A sparse queue set can
therefore wake the wrong MSI-X vectors and leave completed requests
stalled after restore.
Retain each queue index alongside its eventfd during activate(). Use
the saved index for resume interrupts so each notification reaches the
queue's original vector.
Assisted-by: OpenAI:GPT-5.6-Sol
Signed-off-by: Yi Wang <foxywang@tencent.com>
QCOW metadata published a fully deallocated cluster before the
caller performed the host punch-hole. Under multi-queue load, a
concurrent metadata flush could make the cluster allocatable, and
another queue could reuse it before the delayed punch ran. If reused as
an L2 table, the stale punch erased live metadata and made guest data
unreachable.
This was observed in production as confirmed guest data loss, with
allocated guest clusters becoming refcounted but unreachable from the
QCOW mapping.
Keep punch-pending clusters out of both free lists. Publish a cluster
only after the host punch succeeds, so another metadata flush is
required before reuse.
Add deterministic coverage for the cross-queue schedule and for host
operation failures.
Signed-off-by: doge <me@crackerben.com>
apply_dealloc_action() discarded the result of the host punch-hole
and write-zeroes operations, so a guest DISCARD or WRITE ZEROES
request completed successfully even when the host operation failed.
Return the error to the per-queue engine and complete the request
with an error instead, in both the synchronous and io_uring QCOW
engines. A failure does not abort the remaining actions of the
request: they are still applied, and the first error is reported.
Signed-off-by: doge <me@crackerben.com>
A Unix stream connection can succeed while the process owning the
listener is exiting. The resulting connection can then fail during
SET_OWNER, GET_FEATURES, or later reinitialization.
Retry the complete connect and reinitialization transaction when it
returns a transport failure within a 60-second retry window. Each retry
uses a fresh frontend. Connection errors retain their existing handling,
non-transport errors fail immediately, and waits remain interruptible by
the worker kill event.
Signed-off-by: Peter Delevoryas <pdel@meta.com>
Assisted-by: Codex:GPT-5
This adds a threat model and security policy. It is loosely based on
the Xen Project Security Policy, but with many changes to fit Cloud
Hypervisor better.
The threat model is comprehensive and includes:
- Which entities are fully trusted.
- What untrusted entities are and are not allowed to do.
- What Cloud Hypervisor expects from its deployment environment.
- What trusted entities can safely do on behalf of untrusted entities.
Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
The number of queues is limited to a u16 so this most consistent. The
vm-virtio crate API unfortunately uses usize but its safe to convert up
from u16 to usize.
Signed-off-by: Rob Bradford <rbradford@meta.com>
This removes a need to expose a method from the CpuManager back out to
the Vm which is called immediately after creating the CpuManager.
Signed-off-by: Rob Bradford <rbradford@meta.com>
create_cpu_nodes() emits one shared-L3 cache node per package when the
host reports a shared L3, but names every node with the constant
"l3-cache0". For a guest topology with packages >= 2 the generated
device tree carries the same name siblings.
Fixes: 5857d4851
Assisted-by: Claude:Opus-4.8 (1M context)
Signed-off-by: Isaku Yamahata <iyamahata@crusoe.ai>
The raw, qcow, and vhdx sync engines each carried an EventFd and a
VecDeque of completions and repeated the same push and signal idiom at
every completion site. Bundle the two into a SyncCompletionQueue with
complete, notifier, and next_completed, and route the three engines
through it. The repeated eventfd signal now lives in one place.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
test_create_fdt_with_devices() fails with a divide by zero. The caller
passes Some((0, 0, 0, 0)) for CPU topology as (threads_per_core,
cores_per_die, dies_per_package, packages). The valid default is
(1, 1, 1, 1), not all zero. Pass None because the eventual callee,
create_cpu_nodes(), checks None to get the right default value.
This affects the unit test only. A real VM never hits it because
VmConfig::validate() rejects zero with an error.
Fixes: 7fb980f17 ("arch, vmm: Pass cpu topology configuation to FDT")
Assisted-by: Claude:Opus-4.8 (1M context)
Signed-off-by: Isaku Yamahata <iyamahata@crusoe.ai>
Reject buf.len() that isn't sector_count * logical_sector_size in
io::read/write (VhdxIoError::InvalidBufferLength), and reject buf.len()
not a multiple of the sector size in Vhdx's Read/Write impl, before it's
converted to a sector count/index.
Signed-off-by: Alexander Lvov <alexander.lvov.git@gmail.com>
cloud-hypervisor always advertises a 512-byte logical block size over
virtio-blk, so a 4096-byte-sector VHDx image could never be addressed
correctly. Reject it at metadata parse time, matching QEMU's VHDx
support.
Signed-off-by: Alexander Lvov <alexander.lvov.git@gmail.com>
io::read/write sliced buf using free_sectors * SECTOR_SIZE, a hardcoded
512-byte constant, instead of the file's real logical sector size
([MS-VHDX] allows 512 or 4,096). On a 4096-byte-sector image, only the
first 512 bytes of each sector were transferred while the full 4096 was
reported as done.
Use sector.free_bytes instead.
Signed-off-by: Alexander Lvov <alexander.lvov.git@gmail.com>
Reimplement run_unaligned_operation over AlignedFile read_vectored_at
and write_vectored_at instead of scattering and gathering through the
per operation write_bytes_at and read_bytes_at closures. The aio and
uring engines already reach this helper for the O_DIRECT misaligned
case, so both now share the same vectored bounce path as the sync
engine and the scatter gather logic lives only in AlignedFile.
The operation iovecs point at the same memory that write_bytes_at and
read_bytes_at reach, and the aligned fast path already hands those
iovecs to the kernel, so the direct vectored call is equivalent. For
guest memory read targets the destination pages are marked dirty by
mark_read_dirty in execute_async before the operation is submitted,
independent of how the bounce copies bytes, so the raw iovec path
preserves dirty tracking. Drop the now unneeded mut bindings at the
call sites.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Cover the empty iovec noop, the fast path where iovecs go straight to
preadv or pwritev, and misaligned O_DIRECT scatter and gather across
multiple iovecs including a partial block read-modify-write.
Assisted-by: Claude:Opus-4.8
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Add read_vectored_at and write_vectored_at to AlignedFile. They take
the aligned fast path with a single preadv or pwritev when the offset
and every iovec base and length satisfy the O_DIRECT alignment, and
otherwise bounce through an AlignedBuffer, scattering on read and
gathering with a read-modify-write on write.
Convert the raw sync engine to these methods and drop its raw preadv
and pwritev block. The methods are unsafe because their soundness
depends on the caller passing iovecs that describe valid memory for
iov_len bytes.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
CPU unplug requires co-operation between the guest and the VMM. Ensure
that the CPU the guest marks for eject is the one the VMM expects to be
removed. If the guest were to remove a different vCPU there would be
unexpected behaviour. Further ensure that the boot vCPU is never
unplugged.
Signed-off-by: Rob Bradford <rbradford@meta.com>
vm-memory 0.18 has renamed GuestMemory to GuestMemoryBackend, and made
GuestMemory refer to something less specific. For simplicity, we keep
using GuestMemoryBackend (formerly GuestMemory) everywhere for now. We
can adjust bounds to be less specific later if we find ourselves needing
the newly enabled flexibility.
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Signed-off-by: Rob Bradford <rbradford@meta.com>
All error cases used `ValidationError` with a String containing context
about the error. This is suboptimal as the error kind itself does not
contain any context about the actual failure cause. Furthermore, this
does not allow to build error chains as underlaying errors are replaced
with the respective message string.
We improve the situation by introducing specific error variants for
failure case. This also allows us to test the respective code paths
more easily.
Signed-off-by: Pascal Scholz <pascal.scholz@cyberus-technology.de>
On-behalf-of: SAP pascal.scholz@sap.com
This commit adds support for parsing `zone_updates` from the CLI
for the live migration and restore paths.
Signed-off-by: Pascal Scholz <pascal.scholz@cyberus-technology.de>
On-behalf-of: SAP pascal.scholz@sap.
We consume `zone_updates` from `VmReceiveMigrationData` and
`RestoreConfig` to remap already existing `MemoryZone`s to different
host NUMA nodes. For now, we do not support further changes, such as
altering the size of the respective `MemoryZone`s.
These changes allow to migrate a VM to a host that has the capacity to
host the same `MemoryZone`s on a different NUMA layout.
Signed-off-by: Pascal Scholz <pascal.scholz@cyberus-technology.de>
On-behalf-of: SAP pascal.scholz@sap.com
We use this function in the commit directly following this one to
update the VM configuration. This commit also introduces a test.
Signed-off-by: Pascal Scholz <pascal.scholz@cyberus-technology.de>
On-behalf-of: SAP pascal.scholz@sap.com
It is possible to migrate a VM to a host that might have a different
but compatible NUMA configuration. For example, it should be possible
to move a `MemoryZone` from NUMA node 2 and 3 of the sender to nodes
0 and 1 on the receiver, given sender and receiver nodes are compatible
with respect to available memory.
In such a case, we need to adjust the mapping of guest memory to host
nodes. We need this information for live migration as well as for
snapshot (when performing cold migration). We consume this information
in the following commit.
Signed-off-by: Pascal Scholz <pascal.scholz@cyberus-technology.de>
On-behalf-of: SAP pascal.scholz@sap.com
When a test process group cannot be reaped, the host is left with an
orphaned guest whose ports and interfaces block later tests. Continuing
produces cascading failures that hide the original issue.
Treat a failed cleanup as a test error. By default the runner aborts,
and under --continue-on-failure it records the failure and keeps going.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
ProcessRegistry::cleanup sent SIGKILL to a test's process group and
returned at once. SIGKILL is asynchronous, so a killed process could
still hold its boot listener socket when the next test started, causing
an EADDRINUSE bind failure.
Reap the group after the signal and wait for it to exit before
returning. Return an error if it does not exit within the timeout so a
caller can react to a guest that survived cleanup.
Since cleanup now reaps the whole group, the unit tests drop their Child
handles without waiting. They carry expect(clippy::zombie_processes),
since cleanup already reaps them.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
The qcow2 backend caches L2 table and refcount updates in memory and
only writes them back on a guest-initiated flush, clean shutdown or
drop. A paused VM therefore leaves the on-disk image without the
mappings for any cluster allocated since the last guest flush: the
data clusters are present in the file, but nothing references them.
Anything that reads the image while the VM is paused sees those
writes as missing. Copying the disk alongside vm.snapshot (the
documented snapshot workflow) captures a stale image, and live
migration releases the disk locks after pausing so the destination
reopens the file with the same stale metadata. In both cases writes
the guest has completed, and may later read back, silently disappear.
Add a MetadataSync capability trait with a no-op default, fold it
into FullDiskFile, implement it for the qcow2 backend as a metadata
cache flush, and call it from the virtio-block pause path after
in-flight requests have drained. Pause is the quiesce point both
flows rely on, and it is a cold path, so the extra flush does not
affect runtime I/O.
Reproduced by writing to a qcow2 disk from the guest with O_DIRECT
and no explicit flush, pausing the VM and copying the image: qemu-img
map on the copy shows no mapped clusters and reads return zeros. With
this change the copy contains every completed write. A unit test
covers the same sequence at the format level: a completed write is
invisible to a fresh reader until sync_metadata, and visible after.
Signed-off-by: CMGS <ilskdw@gmail.com>
Each Windows integration test boots a full Windows Server guest using
several vCPUs and gigabytes of RAM. nextest runs up to one test per
logical CPU by default, so the whole suite started at once and thrashed
the host.
Add a dedicated 'windows' nextest profile that inherits from
integration and assigns the tests to a 'windows' test group capped at
four concurrent runs. Point the Windows test scripts at the profile and
drop the redundant retries flag, which now comes from the profile.
Running the tests in parallel is safe because every guest gets a unique
network via next_guest_id, so there is no shared address to conflict
over.
Assisted-by: Claude:Opus-4.8
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
When reconnecting to a vhost-user backend, Cloud Hypervisor keeps the
same queues and currently restarts them from avail_idx.
That can skip descriptors that were made available by the guest but not
completed before the old backend crashed. For queues where
VIRTIO_F_IN_ORDER was negotiated, used_idx is a safe completion
boundary, so reconnect can resume from used_idx and kick the queue if
work remains.
Do not do this when inflight tracking is active, because the backend
inflight state is the more precise recovery mechanism. Also leave queues
without VIRTIO_F_IN_ORDER on the existing avail_idx path, since used_idx
does not identify which descriptors completed for out-of-order devices.
Signed-off-by: Peter Delevoryas <pdel@meta.com>
Client connect retried for a full minute on every failure and did not
watch kill_evt for early exit, unlike reconnect, so teardown and
permanent connect errors both stalled for CONNECT_TIMEOUT.
Update the client path to watch kill_evt for early abort, fail
non-retryable errors immediately, and surface timeout with a dedicated
error.
Partially Fixes#8052
Signed-off-by: Chinmoy <daschinmoyy21@gmail.com>
Assisted-by: GLM 5.2
Exercise the EOPNOTSUPP fallback path using memfd, which shares
the same backing as tmpfs and triggers the fallback without
requiring privileges or a specific filesystem.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
The WriteZeroesAt fallback means write_zeroes no longer fails on
filesystems that lack fallocate support. The skip is now dead
code.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Filesystems such as tmpfs do not support fallocate with
FALLOC_FL_ZERO_RANGE or FALLOC_FL_PUNCH_HOLE and return EOPNOTSUPP.
When a raw disk image lives on such a filesystem, virtio write zeroes
and discard requests fail with IOERR.
Use the WriteZeroesAt trait from vmm_sys_util through AlignedFile,
which already bundles fallocate with a positional write fallback.
For punch_hole, catch EOPNOTSUPP and fall back to the same trait.
The io_uring engine previously submitted fallocate directly through
the ring, where the async EOPNOTSUPP completion had no retry path.
Route it through the same sync helpers that the other engines
already use.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
In case the host MAC address associated with a TAP device wasn't
explicitly provided by the user, Cloud Hypervisor would get the host MAC
associated by default with this TAP device and store it through the
network config. Problem is, in the context of a snapshot/restore, that
meant the network config provided by the user was different on the
destination host compared to the source host. This was causing an issue
when Cloud Hypervisor wasn't started with CAP_NET_ADMIN permissions as
it couldn't set the host MAC address on the destination, while the
source never needed these permissions since the MAC was automatically
allocated by the kernel.
We're fixing this issue by setting the host MAC address when it's
explicitly requested by the user through the network config, and making
the host MAC immutable so that it can't be changed at runtime.
Signed-off-by: Sebastien Boeuf <sboeuf@meta.com>
Further stability improvements in the villain harness keep printed
verdicts when a batch times out, stop batch timeouts from wedging
benign tests, and capture VMM stderr separately so it cannot
corrupt verdict markers, reducing spurious WEDGED results.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Add sparse region support to remote live migration as it will save some
of the network bandwidth and therefore speed up the migration to the
destination VM.
Instead of sending the entire guest RAM over the network, only send
ranges which have been populated during the first iteration. Pages full
of holes are simply skipped.
Signed-off-by: Sebastien Boeuf <sboeuf@meta.com>
Assisted-by: Claude:claude-opus-4-8
