Commit 7847a19b authored by Tony Krowiak's avatar Tony Krowiak Committed by Heiko Carstens
Browse files

s390/vfio-ap: check for TAPQ response codes 0x35 and 0x36 



Check for response codes 0x35 and 0x36 which are asynchronous return codes
indicating a failure of the guest to associate a secret with a queue. Since
there can be no interaction with this queue from the guest (i.e., the vcpus
are out of SIE for hot unplug, the guest is being shut down or an emulated
subsystem reset of the guest is taking place), let's go ahead and re-issue
the ZAPQ to reset and zeroize the queue.

Signed-off-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: default avatarJason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: default avatarHalil Pasic <pasic@linux.ibm.com>
Tested-by: default avatarViktor Mihajlovski <mihajlov@linux.ibm.com>
Link: https://lore.kernel.org/r/20230815184333.6554-10-akrowiak@linux.ibm.com


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent e1f17f8e

drivers/s390/crypto/vfio_ap_ops.c

+12 −1
Original line number Diff line number Diff line
@@ -1612,6 +1612,16 @@ static int apq_status_check(int apqn, struct ap_queue_status *status) 
	case AP_RESPONSE_RESET_IN_PROGRESS:

	case AP_RESPONSE_BUSY:

		return -EBUSY;

	case AP_RESPONSE_ASSOC_SECRET_NOT_UNIQUE:

	case AP_RESPONSE_ASSOC_FAILED:

		/*

		 * These asynchronous response codes indicate a PQAP(AAPQ)

		 * instruction to associate a secret with the guest failed. All

		 * subsequent AP instructions will end with the asynchronous

		 * response code until the AP queue is reset; so, let's return

		 * a value indicating a reset needs to be performed again.

		 */

		return -EAGAIN;

	default:

		WARN(true,

		     "failed to verify reset of queue %02x.%04x: TAPQ rc=%u\n",
@@ -1648,7 +1658,8 @@ static void apq_reset_check(struct work_struct *reset_work) 
		} else {

			if (q->reset_status.response_code == AP_RESPONSE_RESET_IN_PROGRESS ||

			    q->reset_status.response_code == AP_RESPONSE_BUSY ||

			    q->reset_status.response_code == AP_RESPONSE_STATE_CHANGE_IN_PROGRESS) {

			    q->reset_status.response_code == AP_RESPONSE_STATE_CHANGE_IN_PROGRESS ||

			    ret == -EAGAIN) {

				status = ap_zapq(q->apqn, 0);

				memcpy(&q->reset_status, &status, sizeof(status));

				continue;