pseries: Reset vscsi properly

Currently the PAPR vscsi implementation does not properly clear its table
of request tags when the system is reset.  This patch adds a reset hook
to do so.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

hw/spapr_vscsi.c

@@ -893,16 +893,20 @@ static const struct SCSIBusInfo vscsi_scsi_info = {
     .cancel = vscsi_request_cancelled
 };
 
-static int spapr_vscsi_init(VIOsPAPRDevice *dev)
+static void spapr_vscsi_reset(VIOsPAPRDevice *dev)
 {
     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
     int i;
 
-    /* Initialize qemu request tags */
     memset(s->reqs, 0, sizeof(s->reqs));
     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
         s->reqs[i].qtag = i;
     }
+}
+
+static int spapr_vscsi_init(VIOsPAPRDevice *dev)
+{
+    VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 
     dev->crq.SendFunc = vscsi_do_crq;
 
@@ -952,6 +956,7 @@ static void spapr_vscsi_class_init(ObjectClass *klass, void *data)
     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 
     k->init = spapr_vscsi_init;
+    k->reset = spapr_vscsi_reset;
     k->devnode = spapr_vscsi_devnode;
     k->dt_name = "v-scsi";
     k->dt_type = "vscsi";