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virtio: handle non-virtio-1-capable backend for ccw
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post_plugged() callback invoked after features have been queried that can handle the VERSION_1 bit being withdrawn and change ccw to fall back to revision 0 if VERSION_1 is gone.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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@ -59,6 +59,11 @@ typedef struct VirtioBusClass {
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* This is called by virtio-bus just after the device is plugged.
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*/
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void (*device_plugged)(DeviceState *d, Error **errp);
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/*
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* Re-evaluate setup after feature bits have been validated
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* by the device backend.
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*/
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void (*post_plugged)(DeviceState *d, Error **errp);
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/*
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* transport independent exit function.
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* This is called by virtio-bus just before the device is unplugged.
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