56 lines
2.0 KiB
Diff
56 lines
2.0 KiB
Diff
From db812c4073c77c8a64db8d6663b3416a587c7b4a Mon Sep 17 00:00:00 2001
|
|
From: Paolo Bonzini <pbonzini@redhat.com>
|
|
Date: Thu, 23 Aug 2018 14:21:23 +0200
|
|
Subject: [PATCH] virtio: update MemoryRegionCaches when guest negotiates
|
|
features
|
|
|
|
Because the cache is sized to include the rings and the event indices,
|
|
negotiating the VIRTIO_RING_F_EVENT_IDX feature will result in the size
|
|
of the cache changing. And because MemoryRegionCache accesses are
|
|
range-checked, if we skip this we end up with an assertion failure.
|
|
This happens with OpenBSD 6.3.
|
|
|
|
Reported-by: Fam Zheng <famz@redhat.com>
|
|
Fixes: 97cd965c070152bc626c7507df9fb356bbe1cd81
|
|
Cc: qemu-stable@nongnu.org
|
|
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
|
Tested-by: Fam Zheng <famz@redhat.com>
|
|
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
|
|
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
|
|
---
|
|
hw/virtio/virtio.c | 15 +++++++++++++--
|
|
1 file changed, 13 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
|
|
index d4e4d98b595..f6a588ab57e 100644
|
|
--- a/hw/virtio/virtio.c
|
|
+++ b/hw/virtio/virtio.c
|
|
@@ -2006,14 +2006,25 @@ static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val)
|
|
|
|
int virtio_set_features(VirtIODevice *vdev, uint64_t val)
|
|
{
|
|
- /*
|
|
+ int ret;
|
|
+ /*
|
|
* The driver must not attempt to set features after feature negotiation
|
|
* has finished.
|
|
*/
|
|
if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) {
|
|
return -EINVAL;
|
|
}
|
|
- return virtio_set_features_nocheck(vdev, val);
|
|
+ ret = virtio_set_features_nocheck(vdev, val);
|
|
+ if (!ret && virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
+ /* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */
|
|
+ int i;
|
|
+ for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
+ if (vdev->vq[i].vring.num != 0) {
|
|
+ virtio_init_region_cache(vdev, i);
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ return ret;
|
|
}
|
|
|
|
int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
|