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vhost: support PACKED when setting-getting vring_base 

[ Upstream commit 55d8122f5c ]

Use the right structs for PACKED or split vqs when setting and
getting the vring base.

Fixes: 4c8cf31885 ("vhost: introduce vDPA-based backend")
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Message-Id: <20230424225031.18947-3-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shannon Nelson 2023-04-24 15:50:30 -07:00 committed by Greg Kroah-Hartman
parent 6c5a69c5dd
commit b839b65456
2 changed files with 19 additions and 7 deletions
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18
drivers/vhost/vhost.c
View File

@ -1633,17 +1633,25 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
r = -EFAULT;
break;
}
if (s.num > 0xffff) {
r = -EINVAL;
break;
if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
vq->last_avail_idx = s.num & 0xffff;
vq->last_used_idx = (s.num >> 16) & 0xffff;
} else {
if (s.num > 0xffff) {
r = -EINVAL;
break;
}
vq->last_avail_idx = s.num;
}
vq->last_avail_idx = s.num;
/* Forget the cached index value. */
vq->avail_idx = vq->last_avail_idx;
break;
case VHOST_GET_VRING_BASE:
s.index = idx;
s.num = vq->last_avail_idx;
if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED))
s.num = (u32)vq->last_avail_idx | ((u32)vq->last_used_idx << 16);
else
s.num = vq->last_avail_idx;
if (copy_to_user(argp, &s, sizeof s))
r = -EFAULT;
break;

8
drivers/vhost/vhost.h
View File

@ -85,13 +85,17 @@ struct vhost_virtqueue {
/* The routine to call when the Guest pings us, or timeout. */
vhost_work_fn_t handle_kick;
/* Last available index we saw. */
/* Last available index we saw.
* Values are limited to 0x7fff, and the high bit is used as
* a wrap counter when using VIRTIO_F_RING_PACKED. */
u16 last_avail_idx;
/* Caches available index value from user. */
u16 avail_idx;
/* Last index we used. */
/* Last index we used.
* Values are limited to 0x7fff, and the high bit is used as
* a wrap counter when using VIRTIO_F_RING_PACKED. */
u16 last_used_idx;
/* Used flags */