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authorZhenzhong Duan <zhenzhong.duan@intel.com>2023-07-03 15:15:08 +0800
committerCédric Le Goater <clg@redhat.com>2023-07-10 09:52:52 +0200
commit2b43b2995b02e73b70d10b5be2f2b29b68c7e2fa (patch)
treeef1b4a9545a0257b9a201b835581b7b5ed00c18b /hw
parent3c26c80a0a269ce7870d1475e756607e939226cd (diff)
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vfio/migration: Free resources when vfio_migration_realize fails
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> Fixes: a22651053b59 ("vfio: Make vfio-pci device migration capable") Reviewed-by: Cédric Le Goater <clg@redhat.com> Reviewed-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>
Diffstat (limited to 'hw')
-rw-r--r--hw/vfio/migration.c33
-rw-r--r--hw/vfio/pci.c1
2 files changed, 24 insertions, 10 deletions
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index e6e5e85..e395457 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -802,6 +802,17 @@ static int vfio_migration_init(VFIODevice *vbasedev)
return 0;
}
+static void vfio_migration_deinit(VFIODevice *vbasedev)
+{
+ 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 int vfio_block_migration(VFIODevice *vbasedev, Error *err, Error **errp)
{
int ret;
@@ -866,7 +877,7 @@ int 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",
@@ -875,29 +886,31 @@ int 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 0;
+
+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) {
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index c2cf745..9154dd9 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3210,6 +3210,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
ret = vfio_migration_realize(vbasedev, errp);
if (ret) {
error_report("%s: Migration disabled", vbasedev->name);
+ goto out_deregister;
}
}