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virtio: add and use virtio_set_features

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vdev->guest_features is not masking features that are not supported by
the guest.  Fix this by introducing a common wrapper to be used by all
virtio bus implementations.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2011-11-24 13:28:52 +01:00 • committed by Anthony Liguori
parent ae0f940e6b
commit ad0c93328d
5 changed files with 23 additions and 20 deletions
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9
hw/virtio-pci.c
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@ -285,14 +285,9 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
case VIRTIO_PCI_GUEST_FEATURES:
/* Guest does not negotiate properly? We have to assume nothing. */
if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
if (vdev->bad_features)
val = proxy->host_features & vdev->bad_features(vdev);
else
val = 0;
val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
}
if (vdev->set_features)
vdev->set_features(vdev, val);
vdev->guest_features = val;
virtio_set_features(vdev, val);
break;
case VIRTIO_PCI_QUEUE_PFN:
pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;