On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote: > 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.
Can you explain what exactly you mean be userspace? Is it just qemu or is it destined to the virtio_net driver run by the qemu process? Also can you say for what purpose? > > Signed-off-by: Jason Wang <jasow...@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; > 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 59c6c0fbaba1..8a4e6e426bbf 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -145,4 +145,7 @@ > /* Get the valid iova range */ > #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ > struct vhost_vdpa_iova_range) > +/* Get the number of virtqueue groups. */ > +#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x79, unsigned int) > + > #endif > -- > 2.25.1 >
