vhost-vdpa: introduce uAPI to get the number of virtqueue groups

Follows the vDPA support for multiple address spaces, this patch
introduce uAPI for the userspace to know the number of virtqueue
groups supported by the vDPA device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
Message-Id: <20220330180436.24644-12-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index cd1bee536c46de0e5c46e77bae884c0cbe3476cf..92f78df0f6852e5fea2a4bcd9ee635278e7ffdf6 100644 (file)
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -559,6 +559,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
        case VHOST_VDPA_GET_VRING_NUM:
                r = vhost_vdpa_get_vring_num(v, argp);
                break;
+       case VHOST_VDPA_GET_GROUP_NUM:
+               r = copy_to_user(argp, &v->vdpa->ngroups,
+                                sizeof(v->vdpa->ngroups));
+               break;
        case VHOST_SET_LOG_BASE:
        case VHOST_SET_LOG_FD:
                r = -ENOIOCTLCMD;

diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 8f7b4a95d6f9f575531ea9b1c1a99b461b19fa49..61317c61d768fd62657319f471a6ee3863c45a35 100644 (file)
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -145,11 +145,13 @@
 /* Get the valid iova range */
 #define VHOST_VDPA_GET_IOVA_RANGE      _IOR(VHOST_VIRTIO, 0x78, \
                                             struct vhost_vdpa_iova_range)
-
 /* Get the config size */
 #define VHOST_VDPA_GET_CONFIG_SIZE     _IOR(VHOST_VIRTIO, 0x79, __u32)
 
 /* Get the count of all virtqueues */
 #define VHOST_VDPA_GET_VQS_COUNT       _IOR(VHOST_VIRTIO, 0x80, __u32)
 
+/* Get the number of virtqueue groups. */
+#define VHOST_VDPA_GET_GROUP_NUM       _IOR(VHOST_VIRTIO, 0x81, __u32)
+
 #endif