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11380b3619
If you run a qemu advertising VERSION_1 with an old kernel where
vhost did not yet support VERSION_1, you'll end up with a device
that is {modern pci|ccw revision 1} but does not advertise VERSION_1.
This is not a sensible configuration and is rejected by the Linux
guest drivers.
To fix this, add a ->post_plugged() callback invoked after features
have been queried that can handle the VERSION_1 bit being withdrawn
and change ccw to fall back to revision 0 if VERSION_1 is gone.
Note that pci is _not_ fixed; we'll need to rethink the approach
for the next release but at least for pci it's not a regression.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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|---|---|---|
| .. | ||
| dataplane | ||
| vhost-backend.h | ||
| vhost-scsi.h | ||
| vhost.h | ||
| virtio-9p.h | ||
| virtio-access.h | ||
| virtio-balloon.h | ||
| virtio-blk.h | ||
| virtio-bus.h | ||
| virtio-gpu.h | ||
| virtio-input.h | ||
| virtio-net.h | ||
| virtio-rng.h | ||
| virtio-scsi.h | ||
| virtio-serial.h | ||
| virtio.h | ||