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@xxxxxxxxxx> --- drivers/vhost/vdpa.c | 4 ++++ include/uapi/linux/vhost.h | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 1ba7e95619b5..4b8882f55bc9 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -528,6 +528,10 @@ 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 c26452782882..19f1acdfe3ea 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -141,4 +141,8 @@ /* Set event fd for config interrupt*/ #define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int) + +/* Get the number of virtqueue groups. */ +#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x78, unsigned int) + #endif -- 2.20.1
