This regression test demonstrates that detect-zeroes works with
registered buffers. Bug details:
https://gitlab.com/qemu-project/qemu/-/issues/1404
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20230207203719.242926-5-stefanha@redhat.com>