virtio-scsi: Fix some endian bugs with virtio-scsi

The virtio-scsi specification does not specify the correct endianness for
fields in the request structure.  It's therefore best to assume that it is
"guest native" endian since that's the (stupid and poorly defined) norm in
virtio.

However, the qemu device for virtio-scsi has no byteswaps at all, and so
will break if the guest has different endianness from the host.  This patch
fixes it by adding tswap() calls for the sense_len and resid fields in
the request structure.  In theory status_qualifier needs swaps as well,
but that field is never actually touched.  The tag field is a uint64_t, but
since its value is completely arbitrary, it might as well be uint8_t[8]
and so it does not need swapping.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul 'Rusty' Russell <rusty@rustcorp.com.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index 7d546f6ca7c6f26a08c1c1ca2256b46601661c0b..924fc69b739094f662f4a1c00921d7143f463453 100644 (file)
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -424,15 +424,17 @@ static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
                                          size_t resid)
 {
     VirtIOSCSIReq *req = r->hba_private;
+    uint32_t sense_len;
 
     req->resp.cmd->response = VIRTIO_SCSI_S_OK;
     req->resp.cmd->status = status;
     if (req->resp.cmd->status == GOOD) {
-        req->resp.cmd->resid = resid;
+        req->resp.cmd->resid = tswap32(resid);
     } else {
         req->resp.cmd->resid = 0;
-        req->resp.cmd->sense_len =
-            scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE);
+        sense_len = scsi_req_get_sense(r, req->resp.cmd->sense,
+                                       VIRTIO_SCSI_SENSE_SIZE);
+        req->resp.cmd->sense_len = tswap32(sense_len);
     }
     virtio_scsi_complete_req(req);
 }