[PATCH RFC v2 12/12] vfio/ccw: update sense data if a unit check is pending

Dong Jia Shi
2017-01-12T07:25:13Z

Concurrent-sense data is currently not delivered. This patch stores
the concurrent-sense data to the subchannel if a unit check is pending
and the concurrent-sense bit is enabled. Then a TSCH can retreive the
right IRB data back to the guest.

Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
---
hw/vfio/ccw.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 34c719a..cc745b0 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -94,6 +94,7 @@ static void vfio_ccw_io_notifier_handler(void *opaque)
CcwDevice *ccw_dev = CCW_DEVICE(cdev);
SubchDev *sch = ccw_dev->sch;
SCSW *s = &sch->curr_status.scsw;
+ PMCW *p = &sch->curr_status.pmcw;
IRB irb;

if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
@@ -133,6 +134,12 @@ static void vfio_ccw_io_notifier_handler(void *opaque)
/* Update control block via irb. */
copy_scsw_to_guest(s, &irb.scsw);

+ /* If a uint check is pending, copy sense data. */
+ if ((s->dstat & SCSW_DSTAT_UNIT_CHECK) &&
+ (p->chars & PMCW_CHARS_MASK_CSENSE)) {
+ memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
+ }
+
read_err:
css_inject_io_interrupt(sch);
}
--
2.8.4