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virtio-blk: fail get_features when both scsi and 1.0 were set 

SCSI passthrough was no longer supported in virtio 1.0, so this patch
fail the get_features() when both 1.0 and scsi is set. And also only
advertise VIRTIO_BLK_F_SCSI for legacy virtio-blk device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jason Wang 2015-07-27 17:49:20 +08:00 committed by Michael S. Tsirkin
parent 9d5b731dd2
commit efb8206ca7
1 changed files with 9 additions and 1 deletions
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10
hw/block/virtio-blk.c
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@ -731,8 +731,16 @@ static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
if (__virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
if (s->conf.scsi) {
error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
return 0;
}
virtio_add_feature(&features, VIRTIO_F_ANY_LAYOUT);
} else {
virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
}
if (s->conf.config_wce) {
virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE);