[libvirt PATCH v2 2/5] qemu: add virtio-blk-vhost-vdpa capability

[Jonathon Jongsma <jjongsma@xxxxxxxxxx>]

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@xxxxxxxxxx>
Reviewed-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 src/qemu/qemu_capabilities.c                     | 2 ++
 src/qemu/qemu_capabilities.h                     | 1 +
 tests/qemucapabilitiesdata/caps_8.1.0_x86_64.xml | 1 +
 3 files changed, 4 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 87412dd4ec..3a1bfbf74d 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/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 },
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index e51d3fffdc..3c4f7f625b 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/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;
diff --git a/tests/qemucapabilitiesdata/caps_8.1.0_x86_64.xml b/tests/qemucapabilitiesdata/caps_8.1.0_x86_64.xml
index 6f8c5a57b7..d266dd0f31 100644
--- a/tests/qemucapabilitiesdata/caps_8.1.0_x86_64.xml
+++ b/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>
-- 
2.41.0