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alistair23-linux
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vhost-vdpa: support get/set backend features 

This patch makes userspace can get and set backend features to
vhost-vdpa.

Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200804162048.22587-4-eli@mellanox.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
zero-sugar-mainline-defconfig
Jason Wang 2020-08-04 19:20:39 +03:00 committed by Michael S. Tsirkin
parent 460f7ce19f
commit 653055b9ac
1 changed files with 18 additions and 0 deletions
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18
drivers/vhost/vdpa.c
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@ -26,6 +26,10 @@
#include "vhost.h"
enum {
VHOST_VDPA_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)
};
/* Currently, only network backend w/o multiqueue is supported. */
#define VHOST_VDPA_VQ_MAX 2
@ -347,6 +351,8 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
struct vdpa_callback cb;
struct vhost_virtqueue *vq;
struct vhost_vring_state s;
u64 __user *featurep = argp;
u64 features;
u32 idx;
long r;
@ -369,6 +375,18 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
case VHOST_GET_VRING_BASE:
vq->last_avail_idx = ops->get_vq_state(v->vdpa, idx);
break;
case VHOST_GET_BACKEND_FEATURES:
features = VHOST_VDPA_BACKEND_FEATURES;
if (copy_to_user(featurep, &features, sizeof(features)))
return -EFAULT;
return 0;
case VHOST_SET_BACKEND_FEATURES:
if (copy_from_user(&features, featurep, sizeof(features)))
return -EFAULT;
if (features & ~VHOST_VDPA_BACKEND_FEATURES)
return -EOPNOTSUPP;
vhost_set_backend_features(&v->vdev, features);
return 0;
}
r = vhost_vring_ioctl(&v->vdev, cmd, argp);