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virtio_ccw: rev 1 devices set VIRTIO_F_VERSION_1

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What does it mean if rev 1 device does not set
VIRTIO_F_VERSION_1? E.g. is it native endian?

Let's not even try to drive such devices:
fail attempts to finalize features.
virtio core will detect this and bail out.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-12-04 19:16:43 +02:00
parent 5c609a5ef0
commit 4d23676fb6
1 changed files with 7 additions and 0 deletions
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7
drivers/s390/kvm/virtio_ccw.c
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@ -758,6 +758,13 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
struct virtio_feature_desc *features;
struct ccw1 *ccw;
if (vcdev->revision == 1 &&
!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
dev_err(&vdev->dev, "virtio: device uses revision 1 "
"but does not have VIRTIO_F_VERSION_1\n");
return -EINVAL;
}
ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL);
if (!ccw)
return 0;