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css: mss/mcss-e vs. migration

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Our main channel_subsys structure is not a device (yet), but we need
to setup mss/mcss-e again if the guest had enabled it before. Use
a hack that should catch most configurations (assuming that the guest
will have enabled at least one device in higher subchannel sets or
channel subsystems if it enabled the functionality.)

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Cornelia Huck 2015-06-24 10:57:23 +02:00
parent fa8b0ca5d1
commit ec7353a146
1 changed files with 15 additions and 0 deletions
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15
hw/s390x/css.c
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@ -1464,6 +1464,21 @@ int subch_device_load(SubchDev *s, QEMUFile *f)
}
s->ccw_fmt_1 = qemu_get_byte(f);
s->ccw_no_data_cnt = qemu_get_byte(f);
/*
* Hack alert. We don't migrate the channel subsystem status (no
* device!), but we need to find out if the guest enabled mss/mcss-e.
* If the subchannel is enabled, it certainly was able to access it,
* so adjust the max_ssid/max_cssid values for relevant ssid/cssid
* values. This is not watertight, but better than nothing.
*/
if (s->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA) {
if (s->ssid) {
channel_subsys->max_ssid = MAX_SSID;
}
if (s->cssid != channel_subsys->default_cssid) {
channel_subsys->max_cssid = MAX_CSSID;
}
}
return 0;
}