#include "qapi/visitor.h"
#include "hw/qdev.h"
#include "qemu/bitops.h"
+#include "qemu/error-report.h"
#include "exec/address-spaces.h"
#include "cpu.h"
#include "hw/s390x/ioinst.h"
int subch_device_load(SubchDev *s, QEMUFile *f)
{
SubchDev *old_s;
+ Error *err = NULL;
uint16_t old_schid = s->schid;
+ uint16_t old_devno = s->devno;
int i;
s->cssid = qemu_get_byte(f);
s->ssid = qemu_get_byte(f);
s->schid = qemu_get_be16(f);
s->devno = qemu_get_be16(f);
+ if (s->devno != old_devno) {
+ /* Only possible if machine < 2.7 (no css_dev_path) */
+
+ error_setg(&err, "%x != %x", old_devno, s->devno);
+ error_append_hint(&err, "Devno mismatch, tried to load wrong section!"
+ " Likely reason: some sequences of plug and unplug"
+ " can break migration for machine versions prior to"
+ " 2.7 (known design flaw).\n");
+ error_report_err(err);
+ return -EINVAL;
+ }
/* Re-assign subch. */
if (old_schid != s->schid) {
old_s = channel_subsys.css[s->cssid]->sch_set[s->ssid]->sch[old_schid];