On 2020/12/30 下午6:05, Eli Cohen wrote:

On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote:

quoted

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>
---
  drivers/vhost/vdpa.c       | 4 ++++
  include/uapi/linux/vhost.h | 3 +++
  2 files changed, 7 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 060d5b5b7e64..1ba5901b28e7 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c

@@ -536,6 +536,10 @@ 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;

Is this and other ioctls already supported in qemu?

Not yet, the prototype is under development.

I test the series with a small and dedicated userspace program.

Thanks