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vfio/migration: Don't block migration device dirty tracking is unsupported 

By default VFIO migration is set to auto, which will support live
migration if the migration capability is set *and* also dirty page
tracking is supported.

For testing purposes one can force enable without dirty page tracking
via enable-migration=on, but that option is generally left for testing
purposes.

So starting with IOMMU dirty tracking it can use to accommodate the lack of
VF dirty page tracking allowing us to minimize the VF requirements for
migration and thus enabling migration by default for those too.

While at it change the error messages to mention IOMMU dirty tracking as
well.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
[ clg: - spelling in commit log ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Joao Martins 2024-07-22 22:13:25 +01:00 committed by Cédric Le Goater
parent 7c30710bd9
commit f48b472450
1 changed files with 5 additions and 5 deletions
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10
hw/vfio/migration.c
View File

@ -1036,16 +1036,16 @@ bool vfio_migration_realize(VFIODevice *vbasedev, Error **errp)
return !vfio_block_migration(vbasedev, err, errp);
}
if (!vbasedev->dirty_pages_supported) {
if (!vbasedev->dirty_pages_supported && !vbasedev->iommu_dirty_tracking) {
if (vbasedev->enable_migration == ON_OFF_AUTO_AUTO) {
error_setg(&err,
"%s: VFIO device doesn't support device dirty tracking",
vbasedev->name);
"%s: VFIO device doesn't support device and "
"IOMMU dirty tracking", vbasedev->name);
goto add_blocker;
}
warn_report("%s: VFIO device doesn't support device dirty tracking",
vbasedev->name);
warn_report("%s: VFIO device doesn't support device and "
"IOMMU dirty tracking", vbasedev->name);
}
ret = vfio_block_multiple_devices_migration(vbasedev, errp);