On Mon, Apr 24, 2023 at 03:50:30PM -0700, Shannon Nelson via Virtualization
wrote:
Use the right structs for PACKED or split vqs when setting and
getting the vring base.
Signed-off-by: Shannon Nelson <[email protected]>
---
drivers/vhost/vhost.c | 18 +++++++++++++-----
drivers/vhost/vhost.h | 8 ++++++--
2 files changed, 19 insertions(+), 7 deletions(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index f11bdbe4c2c5..f64efda48f21 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -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;
The changes LGTM, but since we are changing the UAPI, should we
update the documentation of VHOST_SET_VRING_BASE and
VHOST_GET_VRING_BASE in include/uapi/linux/vhost.h?
Thanks,
Stefano
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