[Qemu-devel] [PATCH] virtio-scsi: scsi events must be converted to target endianness

[Greg Kurz <gkurz@linux.vnet.ibm.com>]

From: Cédric Le Goater <clg@fr.ibm.com>

Virtio SCSI Events need to be byteswapped before being pushed
when host and guest have a different endianness. Not doing so
breaks hotplug of virtio scsi disks, with the following error
message being printed in the guest console:

virtio_scsi: Unsupport virtio scsi event 1000000

This issue got uncovered while testing disk hotplug with a PowerKVM
ppc64le guest. I have checked that this issue also affects a x86_64
guest run on a ppc64 host.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
[ Ported from PowerKVM,
  Greg Kurz <gkurz@linux.vnet.ibm.com> ]
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
---
 hw/scsi/virtio-scsi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 0b0a331..5568479 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -591,8 +591,8 @@ static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
 
     evt = &req->resp.event;
     memset(evt, 0, sizeof(VirtIOSCSIEvent));
-    evt->event = event;
-    evt->reason = reason;
+    evt->event = virtio_tswap32(vdev, event);
+    evt->reason = virtio_tswap32(vdev, reason);
     if (!dev) {
         assert(event == VIRTIO_SCSI_T_EVENTS_MISSED);
     } else {