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hw/virtio: log potentially buggy guest drivers 

If the guest driver attempts to use the UNUSED(30) bit it is
potentially buggy as 6.3 Legacy Interface: Reserved Feature Bits
states it "SHOULD NOT be negotiated". For now just log this guest
error.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220802095010.3330793-9-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2022-08-02 10:49:56 +01:00 committed by Michael S. Tsirkin
parent c97c76b3e7
commit 8d11c10d06
1 changed files with 7 additions and 0 deletions
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7
hw/virtio/virtio.c
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@ -2980,6 +2980,13 @@ int virtio_set_features(VirtIODevice *vdev, uint64_t val)
if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) {
return -EINVAL;
}
if (val & (1ull << VIRTIO_F_BAD_FEATURE)) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: guest driver for %s has enabled UNUSED(30) feature bit!\n",
__func__, vdev->name);
}
ret = virtio_set_features_nocheck(vdev, val);
if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
/* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */