[Qemu-devel] [PATCH 3/4] virtio-blk: Don't realize zoned block devices

[Dmitry Fomichev <dmitry.fomichev@wdc.com>]

Prevent virtio-blk code from attaching a zoned block device because
it will otherwise appear as a reqular block device at the guest and
that will most certainly cause problems.

The functionality to support ZBDs via virtio-blk should be pretty
useful and there are some attempts underway to get it implemented,
but such work will inevitably lead to some modifications in virtio
protocol spec. Therefore, this activity is considered a more
long-term effort.

So for now, we just don't allow zoned block devices to work via
virtio-blk.

Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
---
 hw/block/virtio-blk.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index cbb3729158..c11e028308 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1140,6 +1140,11 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    if (blk_is_zoned(conf->conf.blk)) {
+        error_setg(errp, "zoned block devices are not supported");
+        return;
+    }
+
     if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) &&
         (!conf->max_discard_sectors ||
          conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) {
-- 
2.21.0