qemu: add virtio-blk-vhost-vdpa capability

Check whether the qemu binary supports the vdpa block driver. We can't
rely simply on the existence of the virtio-blk-vhost-vdpa block driver
since the first releases of qemu didn't support fd-passing for this
driver. So we have to check for the 'fdset' feature on the driver
object. This feature will be present in the qemu 8.1.0 release and was
merged to qemu in commit 98b126f5.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

src/qemu/qemu_capabilities.c

@@ -697,6 +697,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
 
               /* 450 */
               "run-with.async-teardown", /* QEMU_CAPS_RUN_WITH_ASYNC_TEARDOWN */
+              "virtio-blk-vhost-vdpa", /* QEMU_CAPS_DEVICE_VIRTIO_BLK_VHOST_VDPA */
     );
 
 
@@ -1531,6 +1532,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
     { "blockdev-add/arg-type/+rbd/encrypt/format/^luks-any", QEMU_CAPS_RBD_ENCRYPTION_LUKS_ANY },
     { "blockdev-add/arg-type/+nbd/tls-hostname", QEMU_CAPS_BLOCKDEV_NBD_TLS_HOSTNAME },
     { "blockdev-add/arg-type/+qcow2/discard-no-unref", QEMU_CAPS_QCOW2_DISCARD_NO_UNREF },
+    { "blockdev-add/arg-type/+virtio-blk-vhost-vdpa/$fdset", QEMU_CAPS_DEVICE_VIRTIO_BLK_VHOST_VDPA},
     { "blockdev-snapshot/$allow-write-only-overlay", QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY },
     { "chardev-add/arg-type/backend/+socket/data/reconnect", QEMU_CAPS_CHARDEV_RECONNECT },
     { "device_add/$json-cli-hotplug", QEMU_CAPS_DEVICE_JSON },

src/qemu/qemu_capabilities.h

@@ -676,6 +676,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
 
     /* 450 */
     QEMU_CAPS_RUN_WITH_ASYNC_TEARDOWN, /* asynchronous teardown -run-with async-teardown=on|off */
+    QEMU_CAPS_DEVICE_VIRTIO_BLK_VHOST_VDPA, /* virtio-blk-vhost-vdpa block driver */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_8.1.0_x86_64.xml

@@ -197,6 +197,7 @@
   <flag name='rbd-encryption-luks-any'/>
   <flag name='qcow2-discard-no-unref'/>
   <flag name='run-with.async-teardown'/>
+  <flag name='virtio-blk-vhost-vdpa'/>
   <version>8001000</version>
   <microcodeVersion>43100245</microcodeVersion>
   <package>v8.1.0</package>