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vdpa: add VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK flag

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This feature flag allows the driver enabling virtqueues both before and
after DRIVER_OK.

This is needed for software assisted live migration, so userland can
restore the device status in devices with control virtqueue before the
dataplane is enabled.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Shannon Nelson <shannon.nelson@amd.com>
Message-Id: <20230609092127.170673-2-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2023-06-09 11:21:24 +02:00 committed by Michael S. Tsirkin
parent c1081002bf
commit 8b59b4da9b
1 changed files with 4 additions and 0 deletions
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4
include/uapi/linux/vhost_types.h
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@ -181,5 +181,9 @@ struct vhost_vdpa_iova_range {
#define VHOST_BACKEND_F_SUSPEND 0x4
/* Device can be resumed */
#define VHOST_BACKEND_F_RESUME 0x5
/* Device supports the driver enabling virtqueues both before and after
* DRIVER_OK
*/
#define VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK 0x6
#endif