qemu: caps: Add capability for incremental backup support

Add a new all-covering capability which will be used to interlock
incremental backup support until all bits are ready.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

src/qemu/qemu_capabilities.c

@@ -540,6 +540,9 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "dbus-vmstate",
               "vhost-user-gpu",
               "vhost-user-vga",
+
+              /* 340 */
+              "incremental-backup",
     );
 
 

src/qemu/qemu_capabilities.h

@@ -522,6 +522,9 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_DEVICE_VHOST_USER_GPU, /* -device vhost-user-gpu */
     QEMU_CAPS_DEVICE_VHOST_USER_VGA, /* -device vhost-user-vga */
 
+    /* 340 */
+    QEMU_CAPS_INCREMENTAL_BACKUP, /* incremental backup is supported */
+
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;