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vhost-vdpa: Introduce RESUME backend feature bit

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Userspace knows if the device can be resumed or not by checking this
feature bit.

It's only exposed if the vdpa driver backend implements the resume()
operation callback. Userspace trying to negotiate this feature when it
hasn't been exposed will result in an error.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Message-Id: <b18db236ba3d990cdb41278eb4703be9201d9514.1672742878.git.sebastien.boeuf@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
This commit is contained in:
Sebastien Boeuf 2023-01-03 11:51:06 +01:00 • committed by Michael S. Tsirkin
parent 1538a8a49e
commit 69106b6fb3
2 changed files with 17 additions and 1 deletions
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2
include/uapi/linux/vhost_types.h
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@ -163,5 +163,7 @@ struct vhost_vdpa_iova_range {
#define VHOST_BACKEND_F_IOTLB_ASID 0x3
/* Device can be suspended */
#define VHOST_BACKEND_F_SUSPEND 0x4
/* Device can be resumed */
#define VHOST_BACKEND_F_RESUME 0x5
#endif