vhost-vdpa: introduce uAPI to get the number of address spaces

This patch introduces the uAPI for getting the number of address
spaces supported by this vDPA device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
Message-Id: <20220330180436.24644-13-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 92f78df..a017011 100644 (file)
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -563,6 +563,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
                r = copy_to_user(argp, &v->vdpa->ngroups,
                                 sizeof(v->vdpa->ngroups));
                break;
+       case VHOST_VDPA_GET_AS_NUM:
+               r = copy_to_user(argp, &v->vdpa->nas, sizeof(v->vdpa->nas));
+               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 61317c6..5132200 100644 (file)
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -154,4 +154,6 @@
 /* Get the number of virtqueue groups. */
 #define VHOST_VDPA_GET_GROUP_NUM       _IOR(VHOST_VIRTIO, 0x81, __u32)
 
+/* Get the number of address spaces. */
+#define VHOST_VDPA_GET_AS_NUM          _IOR(VHOST_VIRTIO, 0x7A, unsigned int)
 #endif