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virtio-scsi: scsi events must be converted to target endianness 

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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cédric Le Goater 2014-06-30 17:17:17 +02:00 committed by Paolo Bonzini
parent dfecbb95e3
commit 424baff549
1 changed files with 2 additions and 2 deletions
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4
hw/scsi/virtio-scsi.c
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@ -587,8 +587,8 @@ 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 {