[Qemu-devel] [PATCH RFC 12/14] hw/virtio/virtio-blk.h: introduce VIRTIO_BLK_F_MQ

[Ming Lei <ming.lei@canonical.com>]

Prepare for supporting mutli vqs per virtio-blk device.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 include/hw/virtio/virtio-blk.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h
index 45f8894..ad70c9a 100644
--- a/include/hw/virtio/virtio-blk.h
+++ b/include/hw/virtio/virtio-blk.h
@@ -42,6 +42,12 @@
 #define VIRTIO_BLK_F_TOPOLOGY   10      /* Topology information is available */
 #define VIRTIO_BLK_F_CONFIG_WCE 11      /* write cache configurable */
 
+/*
+ * support multi vqs, and virtio_blk_config.num_queues is only
+ * available when this feature is enabled
+ */
+#define VIRTIO_BLK_F_MQ		12
+
 #define VIRTIO_BLK_ID_BYTES     20      /* ID string length */
 
 struct virtio_blk_config
@@ -58,6 +64,8 @@ struct virtio_blk_config
     uint16_t min_io_size;
     uint32_t opt_io_size;
     uint8_t wce;
+    uint8_t unused;
+    uint16_t num_queues;	/* must be at the end */
 } QEMU_PACKED;
 
 /* These two define direction. */
-- 
1.7.9.5