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s390x/css: handle emw correctly for tsch

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We should not try to store the emw portion of the irb if extended
measurements are not applicable. In particular, we should not surprise
the guest by storing a larger irb if it did not enable extended
measurements.

Cc: qemu-stable@nongnu.org
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Cornelia Huck 2014-05-27 12:40:44 +02:00
parent 7721a30442
commit f068d320de
1 changed files with 20 additions and 4 deletions
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24
hw/s390x/css.c
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@ -779,9 +779,11 @@ out:
return ret;
}
static void copy_irb_to_guest(IRB *dest, const IRB *src)
static void copy_irb_to_guest(IRB *dest, const IRB *src, PMCW *pmcw)
{
int i;
uint16_t stctl = src->scsw.ctrl & SCSW_CTRL_MASK_STCTL;
uint16_t actl = src->scsw.ctrl & SCSW_CTRL_MASK_ACTL;
copy_scsw_to_guest(&dest->scsw, &src->scsw);
@ -791,8 +793,22 @@ static void copy_irb_to_guest(IRB *dest, const IRB *src)
for (i = 0; i < ARRAY_SIZE(dest->ecw); i++) {
dest->ecw[i] = cpu_to_be32(src->ecw[i]);
}
for (i = 0; i < ARRAY_SIZE(dest->emw); i++) {
dest->emw[i] = cpu_to_be32(src->emw[i]);
/* extended measurements enabled? */
if ((src->scsw.flags & SCSW_FLAGS_MASK_ESWF) ||
!(pmcw->flags & PMCW_FLAGS_MASK_TF) ||
!(pmcw->chars & PMCW_CHARS_MASK_XMWME)) {
return;
}
/* extended measurements pending? */
if (!(stctl & SCSW_STCTL_STATUS_PEND)) {
return;
}
if ((stctl & SCSW_STCTL_PRIMARY) ||
(stctl == SCSW_STCTL_SECONDARY) ||
((stctl & SCSW_STCTL_INTERMEDIATE) && (actl & SCSW_ACTL_SUSP))) {
for (i = 0; i < ARRAY_SIZE(dest->emw); i++) {
dest->emw[i] = cpu_to_be32(src->emw[i]);
}
}
}
@ -838,7 +854,7 @@ int css_do_tsch(SubchDev *sch, IRB *target_irb)
}
}
/* Store the irb to the guest. */
copy_irb_to_guest(target_irb, &irb);
copy_irb_to_guest(target_irb, &irb, p);
/* Clear conditions on subchannel, if applicable. */
if (stctl & SCSW_STCTL_STATUS_PEND) {