Commit 411b0109 authored by Tony Krowiak's avatar Tony Krowiak Committed by Heiko Carstens
Browse files

s390/vfio-ap: wait for response code 05 to clear on queue reset 



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: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Acked-by: default avatarJanosch Frank <frankja@linux.ibm.com>
Tested-by: default avatarViktor Mihajlovski <mihajlov@linux.ibm.com>
Link: https://lore.kernel.org/r/20230815184333.6554-4-akrowiak@linux.ibm.com


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 7aa7b2a8

drivers/s390/crypto/vfio_ap_ops.c

+2 −0
Original line number Diff line number Diff line
@@ -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