[PATCH 03/12] s390/vfio-ap: wait for response code 05 to clear on queue reset

Tony Krowiak
2023-08-15T18:44:30Z

Response code 05, AP busy, is a valid response code for a ZAPQ or TAPQ.
Instead of returning error -EIO when a ZAPQ fails with response code 05,
let's wait until the queue is no longer busy and try the ZAPQ again.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Tested-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
---
drivers/s390/crypto/vfio_ap_ops.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index be92ba45226d..3f67cfb53d0c 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1611,6 +1611,7 @@ static int apq_status_check(int apqn, struct ap_queue_status *status)
case AP_RESPONSE_DECONFIGURED:
return 0;
case AP_RESPONSE_RESET_IN_PROGRESS:
+ case AP_RESPONSE_BUSY:
return -EBUSY;
default:
WARN(true,
@@ -1663,6 +1664,7 @@ static int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q)
}
break;
case AP_RESPONSE_RESET_IN_PROGRESS:
+ case AP_RESPONSE_BUSY:
/*
* There is a reset issued by another process in progress. Let's wait
* for that to complete. Since we have no idea whether it was a RAPQ or
--
2.39.3