Message ID | 1503965694-10794-37-git-send-email-mdroth@linux.vnet.ibm.com |
---|---|
State | New |
Headers | show
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Series |
Patch Round-up for stable 2.9.1, freeze on 2017-09-04
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expand
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diff --git a/hw/s390x/css.c b/hw/s390x/css.c index 37caa98..b24e8b7 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -14,6 +14,7 @@ #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" @@ -1676,13 +1677,26 @@ void subch_device_save(SubchDev *s, QEMUFile *f) 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]; diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 00b3bde..c0c1db8 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -1264,9 +1264,13 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) SubchDev *s = ccw_dev->sch; VirtIODevice *vdev = virtio_ccw_get_vdev(s); int len; + int ret; s->driver_data = dev; - subch_device_load(s, f); + ret = subch_device_load(s, f); + if (ret) { + return ret; + } len = qemu_get_be32(f); if (len != 0) { dev->indicators = get_indicator(qemu_get_be64(f), len);