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s390x: css: report errors from ccw_dstream_read/write

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ccw_dstream_read/write functions returned values are sometime
not taking into account and reported back to the upper level
of interpretation of CCW instructions.

It follows that accessing an invalid address does not trigger
a subchannel status program check to the guest as it should.

Let's test the return values of ccw_dstream_write[_buf] and
ccw_dstream_read[_buf] and report it to the caller.

Cc: qemu-stable@nongnu.org
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Message-Id: <1617899529-9329-2-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Pierre Morel 2021-04-08 18:32:09 +02:00 • committed by Cornelia Huck
parent d8724020dd
commit d895d25ae2
4 changed files with 69 additions and 27 deletions
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14
hw/s390x/css.c
View file

@ -1055,10 +1055,11 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
}
}
len = MIN(ccw.count, sizeof(sch->sense_data));
ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
ret = ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
memset(sch->sense_data, 0, sizeof(sch->sense_data));
ret = 0;
if (!ret) {
memset(sch->sense_data, 0, sizeof(sch->sense_data));
}
break;
case CCW_CMD_SENSE_ID:
{
@ -1083,9 +1084,10 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
} else {
sense_id[0] = 0;
}
ccw_dstream_write_buf(&sch->cds, sense_id, len);
sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
ret = 0;
ret = ccw_dstream_write_buf(&sch->cds, sense_id, len);
if (!ret) {
sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
}
break;
}
case CCW_CMD_TIC: