From: Farhan Ali <al...@linux.ibm.com>
According to PoPs, when the SCHIB.PMCW bit 8 is 0 status presented by
the device is not made available to the program. So don't inject an
interrupt in the guest if the guest OS has not enabled the
subchannel.
Signed-off-by: Farhan Ali <al...@linux.ibm.com>
Signed-off-by: Eric Farman <far...@linux.ibm.com>
---
Notes:
v0->v1: [EF]
- Update commit message, as the bit in question is bit 8 not 15
hw/vfio/ccw.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 0919ddbeb8..0590a6f512 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -230,6 +230,11 @@ static void vfio_ccw_io_notifier_handler(void *opaque)
return;
}
+ /* Virtual subchannel is not enabled */
+ if (!(schib->pmcw.flags & PMCW_FLAGS_MASK_ENA)) {
+ return;
+ }
+
size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
vcdev->io_region_offset);
if (size == -1) {
--
2.17.1
