qemu: capabilities: Add QEMU_CAPS_BLOCK_EXPORT_ADD

The 'block-export-add' QMP command is a replacement for 'nbd-server-add'
and will allow greater flexibility. Add a capability so that we can
switch to it.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_capabilities.c

@@ -601,6 +601,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               /* 380 */
               "usb-host.hostdevice",
               "virtio-balloon.free-page-reporting",
+              "block-export-add",
     );
 
 
@@ -1170,6 +1171,7 @@ struct virQEMUCapsStringFlags virQEMUCapsCommands[] = {
     { "block-dirty-bitmap-merge", QEMU_CAPS_BITMAP_MERGE },
     { "query-cpu-model-baseline", QEMU_CAPS_QUERY_CPU_MODEL_BASELINE },
     { "query-cpu-model-comparison", QEMU_CAPS_QUERY_CPU_MODEL_COMPARISON },
+    { "block-export-add", QEMU_CAPS_BLOCK_EXPORT_ADD },
 };
 
 struct virQEMUCapsStringFlags virQEMUCapsMigration[] = {

src/qemu/qemu_capabilities.h

@@ -581,6 +581,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     /* 380 */
     QEMU_CAPS_USB_HOST_HOSTDEVICE, /* -device usb-host.hostdevice */
     QEMU_CAPS_VIRTIO_BALLOON_FREE_PAGE_REPORTING, /*virtio balloon free-page-reporting */
+    QEMU_CAPS_BLOCK_EXPORT_ADD, /* 'block-export-add' command is supported */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_5.2.0.x86_64.xml

@@ -245,6 +245,7 @@
   <flag name='blockdev-hostdev-scsi'/>
   <flag name='usb-host.hostdevice'/>
   <flag name='virtio-balloon.free-page-reporting'/>
+  <flag name='block-export-add'/>
   <version>5001050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100243</microcodeVersion>