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s390x/css: fence off MIDA

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MIDA (modified indirect data addressing) is an optional facility, and
we (currently) don't support it. Let's post an operand exception if
the guest tries to set it in the orb and a channel program check
if it is set in a ccw, as specified in the Principles of Operation.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Cornelia Huck 2017-05-24 14:06:12 +02:00 • committed by Christian Borntraeger
parent 8ed179c937
commit 4e19b57b0e
3 changed files with 10 additions and 0 deletions
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5
hw/s390x/css.c
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@ -433,6 +433,11 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
return -EINVAL;
}
/* We don't support MIDA. */
if (ccw.flags & CCW_FLAG_MIDA) {
return -EINVAL;
}
if (ccw.flags & CCW_FLAG_SUSPEND) {
return suspend_allowed ? -EINPROGRESS : -EINVAL;
}