vhost-vdpa: introduce uAPI to set group ASID

Follows the vDPA support for associating ASID to a specific virtqueue
group. This patch adds a uAPI to support setting them from userspace.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
Message-Id: <20220330180436.24644-15-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 aa5cacd..6c7ee0f 100644 (file)
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -473,6 +473,14 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
                else if (copy_to_user(argp, &s, sizeof(s)))
                        return -EFAULT;
                return 0;
+       case VHOST_VDPA_SET_GROUP_ASID:
+               if (copy_from_user(&s, argp, sizeof(s)))
+                       return -EFAULT;
+               if (s.num >= vdpa->nas)
+                       return -EINVAL;
+               if (!ops->set_group_asid)
+                       return -EOPNOTSUPP;
+               return ops->set_group_asid(vdpa, idx, s.num);
        case VHOST_GET_VRING_BASE:
                r = ops->get_vq_state(v->vdpa, idx, &vq_state);
                if (r)

diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 668914c..cab645d 100644 (file)
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -164,4 +164,11 @@
  */
 #define VHOST_VDPA_GET_VRING_GROUP     _IOWR(VHOST_VIRTIO, 0x7B,       \
                                              struct vhost_vring_state)
+/* Set the ASID for a virtqueue group. The group index is stored in
+ * the index field of vhost_vring_state, the ASID associated with this
+ * group is stored at num field of vhost_vring_state.
+ */
+#define VHOST_VDPA_SET_GROUP_ASID      _IOW(VHOST_VIRTIO, 0x7C, \
+                                            struct vhost_vring_state)
+
 #endif