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vfio: allow cpr-reboot migration if suspended

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Allow cpr-reboot for vfio if the guest is in the suspended runstate.  The
guest drivers' suspend methods flush outstanding requests and re-initialize
the devices, and thus there is no device state to save and restore.  The
user is responsible for suspending the guest before initiating cpr, such as
by issuing guest-suspend-ram to the qemu guest agent.

Relax the vfio blocker so it does not apply to cpr, and add a notifier that
verifies the guest is suspended.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2024-02-22 09:28:38 -08:00 • committed by Cédric Le Goater
parent d9fa4223b3
commit 0cb51c183a
4 changed files with 23 additions and 2 deletions
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2
hw/vfio/migration.c
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@ -889,7 +889,7 @@ static int vfio_block_migration(VFIODevice *vbasedev, Error *err, Error **errp)
vbasedev->migration_blocker = error_copy(err);
error_free(err);
return migrate_add_blocker(&vbasedev->migration_blocker, errp);
return migrate_add_blocker_normal(&vbasedev->migration_blocker, errp);
}
/* ---------------------------------------------------------------------- */