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| author | Michael S. Tsirkin <mst@redhat.com> | 2010-10-17 20:23:48 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2010-10-27 18:54:02 +0200 |
| commit | 258dc7c96bb4b7ca71d5bee811e73933310e168c (patch) | |
| tree | 6db0801f8457e0e5930c7b7f94ba1c142980b2d8 /hw/virtio.c | |
| parent | 492fb99c4bef274a71178f5fab9b700c469a4230 (diff) | |
| download | focaccia-qemu-258dc7c96bb4b7ca71d5bee811e73933310e168c.tar.gz focaccia-qemu-258dc7c96bb4b7ca71d5bee811e73933310e168c.zip | |
virtio: sanity-check available index
Checking available index upon load instead of only when vm is running makes is easier to debug failures. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/virtio.c')
| -rw-r--r-- | hw/virtio.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/virtio.c b/hw/virtio.c index c8a0fc6ff0..a2a657e132 100644 --- a/hw/virtio.c +++ b/hw/virtio.c @@ -681,6 +681,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f) uint32_t features; uint32_t supported_features = vdev->binding->get_features(vdev->binding_opaque); + uint16_t num_heads; if (vdev->binding->load_config) { ret = vdev->binding->load_config(vdev->binding_opaque, f); @@ -713,6 +714,16 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f) if (vdev->vq[i].pa) { virtqueue_init(&vdev->vq[i]); } + num_heads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; + /* Check it isn't doing very strange things with descriptor numbers. */ + if (num_heads > vdev->vq[i].vring.num) { + fprintf(stderr, "VQ %d size 0x%x Guest index 0x%x " + "inconsistent with Host index 0x%x: delta 0x%x\n", + i, vdev->vq[i].vring.num, + vring_avail_idx(&vdev->vq[i]), + vdev->vq[i].last_avail_idx, num_heads); + return -1; + } if (vdev->binding->load_queue) { ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); if (ret) |