forked from rpms/qemu-kvm
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
146 lines
5.2 KiB
146 lines
5.2 KiB
From a36fa46369fe9bf2a2174e9ed6ab83042e904066 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
|
|
Date: Wed, 12 Jul 2023 17:46:57 +0200
|
|
Subject: [PATCH 27/37] vfio/migration: Free resources when
|
|
vfio_migration_realize fails
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Cédric Le Goater <clg@redhat.com>
|
|
RH-MergeRequest: 179: vfio: live migration support
|
|
RH-Bugzilla: 2192818
|
|
RH-Acked-by: Eric Auger <eric.auger@redhat.com>
|
|
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
RH-Commit: [25/28] b3ab8d3443d4bc12a689dc7d88a94da315814bb7 (clegoate/qemu-kvm-c9s)
|
|
|
|
Bugzilla: https://bugzilla.redhat.com/2192818
|
|
|
|
commit 2b43b2995b02
|
|
Author: Zhenzhong Duan <zhenzhong.duan@intel.com>
|
|
Date: Mon Jul 3 15:15:08 2023 +0800
|
|
|
|
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>
|
|
|
|
Signed-off-by: Cédric Le Goater <clg@redhat.com>
|
|
---
|
|
hw/vfio/migration.c | 33 +++++++++++++++++++++++----------
|
|
hw/vfio/pci.c | 1 +
|
|
2 files changed, 24 insertions(+), 10 deletions(-)
|
|
|
|
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
|
|
index e6e5e85f75..e3954570c8 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 922c81872c..037b7d4176 100644
|
|
--- a/hw/vfio/pci.c
|
|
+++ b/hw/vfio/pci.c
|
|
@@ -3234,6 +3234,7 @@ 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;
|
|
}
|
|
}
|
|
|
|
--
|
|
2.39.3
|
|
|