[19/21] vfio/ccw: update sense data if a unit check is pending

Commit Message

Cornelia Huck May 19, 2017, 10:55 a.m. UTC

From: Dong Jia Shi <[e-mail]>

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.

Acked-by: Alex Williamson <[e-mail]>
Signed-off-by: Dong Jia Shi <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Cornelia Huck <[e-mail]>
---
 hw/vfio/ccw.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 007ce435f1..12d0262336 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;
     int size;
 
@@ -143,6 +144,12 @@  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);
 }