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virtio: allow to fail setting status

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virtio-1 allow setting of the FEATURES_OK status bit to fail if
the negotiated feature bits are inconsistent: let's fail
virtio_set_status() in that case and update virtio-ccw to post an
error to the guest.

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>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2015-06-04 12:34:15 +02:00 • committed by Michael S. Tsirkin
parent 6c0196d702
commit 0b352fd680
3 changed files with 37 additions and 10 deletions
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20
hw/s390x/virtio-ccw.c
View file

@ -497,15 +497,19 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
virtio_ccw_stop_ioeventfd(dev);
}
virtio_set_status(vdev, status);
if (vdev->status == 0) {
virtio_reset(vdev);
if (virtio_set_status(vdev, status) == 0) {
if (vdev->status == 0) {
virtio_reset(vdev);
}
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
virtio_ccw_start_ioeventfd(dev);
}
sch->curr_status.scsw.count = ccw.count - sizeof(status);
ret = 0;
} else {
/* Trigger a command reject. */
ret = -ENOSYS;
}
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
virtio_ccw_start_ioeventfd(dev);
}
sch->curr_status.scsw.count = ccw.count - sizeof(status);
ret = 0;
}
break;
case CCW_CMD_SET_IND: