qemu_capabilities: Introduce QEMU_CAPS_AIO_IO_URING

Add io_uring value to capability replies.

The capability QEMU_CAPS_AIO_IO_URING will be used for io_uring aio mode,
introduced from QEMU 5.0, linux 5.1.

Signed-off-by: Han Han <hhan@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

src/qemu/qemu_capabilities.c

@@ -573,6 +573,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "fsdev.multidevs",
               "virtio.packed",
               "pcie-root-port.hotplug",
+              "aio.io_uring",
     );
 
 
@@ -1461,6 +1462,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {
     { "blockdev-add/arg-type/+nvme", QEMU_CAPS_DRIVE_NVME },
     { "query-named-block-nodes/arg-type/flat", QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT },
     { "blockdev-snapshot/$allow-write-only-overlay", QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY },
+    { "blockdev-add/arg-type/+file/aio/^io_uring", QEMU_CAPS_AIO_IO_URING },
 };
 
 typedef struct _virQEMUCapsObjectTypeProps virQEMUCapsObjectTypeProps;

src/qemu/qemu_capabilities.h

@@ -554,6 +554,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_FSDEV_MULTIDEVS, /* fsdev.multidevs */
     QEMU_CAPS_VIRTIO_PACKED_QUEUES, /* virtio.packed */
     QEMU_CAPS_PCIE_ROOT_PORT_HOTPLUG, /* pcie-root-port.hotplug */
+    QEMU_CAPS_AIO_IO_URING, /* -blockdev {...,"aio":"io_uring",...} */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml

@@ -230,6 +230,7 @@
   <flag name='fsdev.multidevs'/>
   <flag name='virtio.packed'/>
   <flag name='pcie-root-port.hotplug'/>
+  <flag name='aio.io_uring'/>
   <version>4002093</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>