mirror of https://github.com/proxmox/mirror_qemu
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>master
parent
492fb99c4b
commit
258dc7c96b
11
hw/virtio.c
11
hw/virtio.c
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@ -681,6 +681,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
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uint32_t features;
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uint32_t supported_features =
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vdev->binding->get_features(vdev->binding_opaque);
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uint16_t num_heads;
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if (vdev->binding->load_config) {
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ret = vdev->binding->load_config(vdev->binding_opaque, f);
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@ -713,6 +714,16 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
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if (vdev->vq[i].pa) {
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virtqueue_init(&vdev->vq[i]);
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}
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num_heads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
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/* Check it isn't doing very strange things with descriptor numbers. */
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if (num_heads > vdev->vq[i].vring.num) {
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fprintf(stderr, "VQ %d size 0x%x Guest index 0x%x "
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"inconsistent with Host index 0x%x: delta 0x%x\n",
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i, vdev->vq[i].vring.num,
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vring_avail_idx(&vdev->vq[i]),
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vdev->vq[i].last_avail_idx, num_heads);
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return -1;
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}
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if (vdev->binding->load_queue) {
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ret = vdev->binding->load_queue(vdev->binding_opaque, i, f);
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if (ret)
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