[Qemu-devel] [PATCH V4 2/3] virtio-blk: fail get_features when both scsi and 1.0 were set

[Jason Wang <jasowang@redhat.com>]

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>
---
 hw/block/virtio-blk.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index a6cf008..9acbc3a 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -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, "Virtio 1.0 does not support scsi passthrough!");
+            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);
-- 
2.1.4