The API socket path was removed unconditionally when the process
exited, including on a failed start. On a failed start where another
running instance already held the path, that deleted the live
instance's socket.
Remove the socket only when start_vmm returned Ok, meaning this process
owned and bound it. A stale socket left by a crash is cleaned up under
the lock by the next start, so dropping the unconditional removal does
not leak sockets, and a failed start no longer clobbers a socket owned
by another instance.
Signed-off-by: Max Makarov <maxpain@linux.com>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
When Cloud Hypervisor crashed or was killed, the API socket file was
left on disk, so the next start failed with EADDRINUSE ("Address already
in use") and the VMM could not restart. This affects any environment
where the socket directory survives across restarts (systemd services,
Kubernetes emptyDir volumes, and so on).
Before binding the path-based API socket, take an exclusive lock on a
sidecar "<socket>.lock" file using the block crate's OFD-lock helper.
Holding it proves no other instance is bound to this path, so a stale
socket left by a crashed run can be removed safely and race-free. If
the lock is already held, fail with a clear "API socket is already in
use" error instead of clobbering the live instance. The lock is held
for the process lifetime and released by the kernel on exit or crash.
The fd-based (socket-activation) path is left unchanged.
This implements the lock-file approach suggested by @DemiMarie.
Fixes: #7784
Signed-off-by: Max Makarov <maxpain@linux.com>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
Fix racy seccomp kill on shutdown. When a VM shuts down the
event-monitor thread's recv() loop ends and the thread exits. glibc's
thread teardown then runs __malloc_arena_thread_freeres, which trims the
per-thread malloc arena with madvise(MADV_DONTNEED).
Add madvise to the allowed calls to match other threads. The crash is
intermittent because it only fires when that thread's arena accumulated
trimmable memory by shutdown.
Signed-off-by: Dylan Reid <dgreid@fb.com>
VmConfig and its nested configuration structs, the VmInfoResponse
wrapper and DeviceNode serialize their Option<T> fields as JSON null
when unset. The OpenAPI specification types these fields as
non-nullable, so strict client generators (for example ogen for Go)
reject /vm.info responses and cannot generate a working API client.
Apply serde_with's skip_serializing_none to the affected structs so
that unset optional fields are omitted from the serialized JSON instead
of being emitted as null. API responses now validate against the
existing specification unchanged; no nullable annotations are required.
Fixes: #7775
Signed-off-by: Max Makarov <maxpain@linux.com>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
The HTTP API mapped every ApiError to 500 Internal Server Error, so an
API client could not distinguish "the VM has not been created yet" from
a genuine server-side failure without parsing the error message text.
Derive the HTTP status code from the error itself in error_response():
errors whose root cause is VmError::VmNotCreated or VmMissingConfig are
now reported as 404 Not Found, regardless of which API action surfaced
them. The existing 400 (bad request) and 429 (too many requests)
mappings are preserved.
State-conflict errors such as VmNotRunning would ideally map to 409
Conflict, but micro_http's StatusCode has no Conflict variant, so they
remain 500 for now.
Fixes: #7774
Signed-off-by: Max Makarov <maxpain@linux.com>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
Feed Ok into VirtioPciDeviceActivator and assert that activate returns
Ok, device_activated becomes true, DEVICE_NEEDS_RESET is not set,
status is otherwise unchanged, no Config interrupt is delivered, and
the barrier waiter unblocks normally.
Assisted-by: Claude:Opus-4.7
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Feed BadActivate into VirtioPciDeviceActivator and assert that the
error propagates, device_activated stays false, DEVICE_NEEDS_RESET is
set in status, a single Config interrupt is delivered, and a thread
waiting on the activation barrier unblocks. The barrier release is
the deadlock fixed by the NEEDS_RESET on activation failure change.
Assisted-by: Claude:Opus-4.7
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Add TestVirtioDevice with a controllable ActivateResult,
TestVirtioInterrupt that records delivered interrupt types, and a
make_activator helper that builds a complete VirtioPciDeviceActivator
with observable status, activated flag, interrupt log, and barrier.
Assisted-by: Claude:Opus-4.7
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
When the guest writes DRIVER_OK and the device fails to activate, the
VMM previously bubbled the error up via VirtioActivate and never
released the activation barrier, leaving the vCPU that wrote DRIVER_OK
blocked on the barrier and effectively deadlocking the guest.
Per virtio 1.3 section 2.1.2, a device that has experienced an error
it cannot recover from should set DEVICE_NEEDS_RESET in its status and
notify the driver via a configuration change interrupt. Do that on
activation failure through the existing mark_device_needs_reset
helper, then release the activation barrier so the vCPU can resume.
DeviceManager::activate_virtio_devices now logs and continues instead
of aborting the whole pending list, so one failing device does not
take down the VMM or block pause and migration. The activator has
already reported the failure with the device id.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Boot Windows with vTPM enabled and verify the TPM device enumerates
after the guest is reachable.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Extend test_tpm to issue random, fixed-property, PCR read, and PCR
event commands before and after a guest reboot.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Cover the short CRB register accesses and data-buffer boundary
conditions used by Windows Server 2025.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Extract the TPM2_Startup(CLEAR) response-code check so the accepted
swtpm reset results can be covered directly.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Extract CRB completion, register-read, and data-buffer range handling
so the fixed access rules can be tested without a live TPM backend.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Windows reboot recreates the TPM device while the swtpm process keeps
running. Leaving the transferred data fd open made a later CmdSetDatafd
fail, and the backend could remain unstarted after CmdInit.
Close both ends on setup failure, close the local transferred fd after
success, close the data fd on drop, and issue TPM2_Startup(CLEAR) after
CmdInit while tolerating an already-started TPM.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
Windows can access CRB registers with byte-sized writes and reads. The
TPM device model used the byte offset as a u32 register index, which
corrupted unaligned accesses and could expose invalid CRB state.
Preserve the containing register on partial writes, read from the
correct byte lane, allow exact-end buffer accesses.
Assisted-by: Copilot:GPT-5.5
Signed-off-by: Wei Liu <liuwe@microsoft.com>
RX packet assembly checks descriptor capacity before the backend sees
the packet. The backend then updates hdr.len before the header is
written back.
Validate that final length before committing the header, so we never
tell the guest that more bytes were written than fit in the RX buffer.
Assisted-by: Codex:GPT-5
Signed-off-by: Dylan Reid <dgreid@fb.com>
