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vdpa: Fix endian bugs in shadow virtqueue

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VDPA didn't work on a big-endian machine due to missing/incorrect
CPU<->LE data format conversions.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
Message-Id: <20250212164923.1971538-1-kshk@linux.ibm.com>
Fixes: 10857ec0ad ("vhost: Add VhostShadowVirtqueue")
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Konstantin Shkolnyy 2025-02-12 10:49:23 -06:00 • committed by Michael S. Tsirkin
parent 590de17b82
commit 50e9754149
1 changed files with 10 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

18
hw/virtio/vhost-shadow-virtqueue.c
View file

@ -182,10 +182,10 @@ static bool vhost_svq_vring_write_descs(VhostShadowVirtqueue *svq, hwaddr *sg,
descs[i].len = cpu_to_le32(iovec[n].iov_len);
last = i;
i = cpu_to_le16(svq->desc_next[i]);
i = svq->desc_next[i];
}
svq->free_head = le16_to_cpu(svq->desc_next[last]);
svq->free_head = svq->desc_next[last];
return true;
}
@ -247,10 +247,12 @@ static void vhost_svq_kick(VhostShadowVirtqueue *svq)
smp_mb();
if (virtio_vdev_has_feature(svq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
uint16_t avail_event = *(uint16_t *)(&svq->vring.used->ring[svq->vring.num]);
uint16_t avail_event = le16_to_cpu(
*(uint16_t *)(&svq->vring.used->ring[svq->vring.num]));
needs_kick = vring_need_event(avail_event, svq->shadow_avail_idx, svq->shadow_avail_idx - 1);
} else {
needs_kick = !(svq->vring.used->flags & VRING_USED_F_NO_NOTIFY);
needs_kick =
!(svq->vring.used->flags & cpu_to_le16(VRING_USED_F_NO_NOTIFY));
}
if (!needs_kick) {
@ -386,7 +388,7 @@ static bool vhost_svq_more_used(VhostShadowVirtqueue *svq)
return true;
}
svq->shadow_used_idx = cpu_to_le16(*(volatile uint16_t *)used_idx);
svq->shadow_used_idx = le16_to_cpu(*(volatile uint16_t *)used_idx);
return svq->last_used_idx != svq->shadow_used_idx;
}
@ -404,7 +406,7 @@ static bool vhost_svq_enable_notification(VhostShadowVirtqueue *svq)
{
if (virtio_vdev_has_feature(svq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
uint16_t *used_event = (uint16_t *)&svq->vring.avail->ring[svq->vring.num];
*used_event = svq->shadow_used_idx;
*used_event = cpu_to_le16(svq->shadow_used_idx);
} else {
svq->vring.avail->flags &= ~cpu_to_le16(VRING_AVAIL_F_NO_INTERRUPT);
}
@ -429,7 +431,7 @@ static uint16_t vhost_svq_last_desc_of_chain(const VhostShadowVirtqueue *svq,
uint16_t num, uint16_t i)
{
for (uint16_t j = 0; j < (num - 1); ++j) {
i = le16_to_cpu(svq->desc_next[i]);
i = svq->desc_next[i];
}
return i;
@ -704,7 +706,7 @@ void vhost_svq_start(VhostShadowVirtqueue *svq, VirtIODevice *vdev,
svq->desc_state = g_new0(SVQDescState, svq->vring.num);
svq->desc_next = g_new0(uint16_t, svq->vring.num);
for (unsigned i = 0; i < svq->vring.num - 1; i++) {
svq->desc_next[i] = cpu_to_le16(i + 1);
svq->desc_next[i] = i + 1;
}
}