[PATCH] Fix race condition when detaching a device
Michal Prívozník
mprivozn at redhat.com
Wed Oct 12 12:09:10 UTC 2022
On 8/31/22 14:22, Pierre LIBEAU wrote:
> Qemu reply to libvirt "DeviceNotFound" and libvirt didn't clean on the
> side the live configuration.
>
> qemuMonitorDelDevice() return -2 to qemuDomainDeleteDevice() and during
> this action in qemuDomainDetachDeviceLive() the remove is never call.
>
> Ref #359
We tend to put 'Resolves:' with full URL so that it's directly clickable
when viewing the git log.
>
> Signed-off-by: Pierre LIBEAU <pierre.libeau at corp.ovh.com>
> ---
> src/qemu/qemu_hotplug.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
> index 9b508dc8f0..52a14a4476 100644
> --- a/src/qemu/qemu_hotplug.c
> +++ b/src/qemu/qemu_hotplug.c
> @@ -93,6 +93,8 @@ qemuDomainResetDeviceRemoval(virDomainObj *vm);
> *
> * Returns: 0 on success,
> * -1 otherwise.
> + * -2 device does not exist in qemu, but it still
> + * exists in libvirt
> */
> static int
> qemuDomainDeleteDevice(virDomainObj *vm,
> @@ -124,7 +126,6 @@ qemuDomainDeleteDevice(virDomainObj *vm,
> * domain XML is queried right after detach API the
> * device would still be there. */
> VIR_DEBUG("Detaching of device %s failed and no event arrived", alias);
> - rc = 0;
> }
> }
>
> @@ -6055,7 +6056,11 @@ qemuDomainDetachDeviceLive(virDomainObj *vm,
> if (!async)
> qemuDomainMarkDeviceForRemoval(vm, info);
>
> - if (qemuDomainDeleteDevice(vm, info->alias) < 0) {
> + int rc;
We don't really allow declarations in the middle of a block.
> + rc = qemuDomainDeleteDevice(vm, info->alias);
> + if (rc < 0) {
> + if (rc == -2)
> + ret = qemuDomainRemoveDevice(driver, vm, &detach);
Oops a TAB sneaked in.
> if (virDomainObjIsActive(vm))
> qemuDomainRemoveAuditDevice(vm, &detach, false);
> goto cleanup;
Fixed up all the small nits and pushed.
Reviewed-by: Michal Privoznik <mprivozn at redhat.com>
Michal
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