@@ -802,6 +802,19 @@ static int vfio_migration_init(VFIODevice *vbasedev)
return 0;
}
+static void vfio_migration_deinit(VFIODevice *vbasedev)
+{
+ if (vbasedev->migration) {
+ VFIOMigration *migration = vbasedev->migration;
+
+ remove_migration_state_change_notifier(&migration->migration_state);
+ qemu_del_vm_change_state_handler(migration->vm_state);
+ unregister_savevm(VMSTATE_IF(vbasedev->dev), "vfio", vbasedev);
+ vfio_migration_free(vbasedev);
+ vfio_unblock_multiple_devices_migration();
+ }
+}
+
static bool vfio_block_migration(VFIODevice *vbasedev, Error *err, Error **errp)
{
int ret;
@@ -871,7 +884,7 @@ bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp)
error_setg(&err,
"%s: VFIO device doesn't support device dirty tracking",
vbasedev->name);
- return vfio_block_migration(vbasedev, err, errp);
+ goto add_blocker;
}
warn_report("%s: VFIO device doesn't support device dirty tracking",
@@ -880,30 +893,30 @@ bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp)
ret = vfio_block_multiple_devices_migration(vbasedev, errp);
if (!ret) {
- return ret;
+ goto out_deinit;
}
if (vfio_viommu_preset(vbasedev)) {
error_setg(&err, "%s: Migration is currently not supported "
"with vIOMMU enabled", vbasedev->name);
- return vfio_block_migration(vbasedev, err, errp);
+ goto add_blocker;
}
trace_vfio_migration_realize(vbasedev->name);
return true;
+
+add_blocker:
+ ret = vfio_block_migration(vbasedev, err, errp);
+out_deinit:
+ if (!ret) {
+ vfio_migration_deinit(vbasedev);
+ }
+ return ret;
}
void vfio_migration_exit(VFIODevice *vbasedev)
{
- if (vbasedev->migration) {
- VFIOMigration *migration = vbasedev->migration;
-
- remove_migration_state_change_notifier(&migration->migration_state);
- qemu_del_vm_change_state_handler(migration->vm_state);
- unregister_savevm(VMSTATE_IF(vbasedev->dev), "vfio", vbasedev);
- vfio_migration_free(vbasedev);
- vfio_unblock_multiple_devices_migration();
- }
+ vfio_migration_deinit(vbasedev);
if (vbasedev->migration_blocker) {
migrate_del_blocker(vbasedev->migration_blocker);
@@ -3208,8 +3208,9 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
if (!pdev->failover_pair_id) {
ret = vfio_migration_realize(vbasedev, errp);
- if (ret) {
+ if (!ret) {
error_report("%s: Migration disabled", vbasedev->name);
+ goto out_deregister;
}
}
When vfio_realize() succeeds, hot unplug will call vfio_exitfn() to free resources allocated in vfio_realize(); when vfio_realize() fails, vfio_exitfn() is never called and we need to free resources in vfio_realize(). In the case that vfio_migration_realize() fails, e.g: with -only-migratable & enable-migration=off, we see below: (qemu) device_add vfio-pci,host=81:11.1,id=vfio1,bus=root1,enable-migration=off 0000:81:11.1: Migration disabled Error: disallowing migration blocker (--only-migratable) for: 0000:81:11.1: Migration is disabled for VFIO device If we hotplug again we should see same log as above, but we see: (qemu) device_add vfio-pci,host=81:11.1,id=vfio1,bus=root1,enable-migration=off Error: vfio 0000:81:11.1: device is already attached That's because some references to VFIO device isn't released. For resources allocated in vfio_migration_realize(), free them by jumping to out_deinit path with calling a new function vfio_migration_deinit(). For resources allocated in vfio_realize(), free them by jumping to de-register path in vfio_realize(). Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com> --- hw/vfio/migration.c | 37 +++++++++++++++++++++++++------------ hw/vfio/pci.c | 3 ++- 2 files changed, 27 insertions(+), 13 deletions(-)