From: Si-Wei Liu Date: Wed, 18 Oct 2023 17:14:43 +0000 (+0300) Subject: vhost-vdpa: uAPI to get dedicated descriptor group id X-Git-Tag: v6.7-rc1~54^2~30 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c8068d9bae0c78e8880451b94668253449b2d71d;p=thirdparty%2Fkernel%2Flinux.git vhost-vdpa: uAPI to get dedicated descriptor group id With _F_DESC_ASID backend feature, the device can now support the VHOST_VDPA_GET_VRING_DESC_GROUP ioctl, and it may expose the descriptor table (including avail and used ring) in a different group than the buffers it contains. This new uAPI will fetch the group ID of the descriptor table. Signed-off-by: Si-Wei Liu Acked-by: Eugenio Pérez Acked-by: Jason Wang Message-Id: <20231018171456.1624030-6-dtatulea@nvidia.com> Signed-off-by: Michael S. Tsirkin Reviewed-by: Si-Wei Liu Tested-by: Si-Wei Liu Tested-by: Lei Yang --- diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 2f21798a37ee0..851535f57b958 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -613,6 +613,16 @@ 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_GET_VRING_DESC_GROUP: + if (!vhost_vdpa_has_desc_group(v)) + return -EOPNOTSUPP; + s.index = idx; + s.num = ops->get_vq_desc_group(vdpa, idx); + if (s.num >= vdpa->ngroups) + return -EIO; + 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; diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index f5c48b61ab622..649560c685f13 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -219,4 +219,12 @@ */ #define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E) +/* Get the group for the descriptor table including driver & device areas + * of a virtqueue: read index, write group in num. + * The virtqueue index is stored in the index field of vhost_vring_state. + * The group ID of the descriptor table for this specific virtqueue + * is returned via num field of vhost_vring_state. + */ +#define VHOST_VDPA_GET_VRING_DESC_GROUP _IOWR(VHOST_VIRTIO, 0x7F, \ + struct vhost_vring_state) #endif