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s390/vfio-ap: clean up irq resources if possible 

The architecture does not specify whether interrupts are disabled as part
of the asynchronous reset or upon return from the PQAP/ZAPQ instruction.
If, however, PQAP/ZAPQ completes with APQSW response code 0 and the
interrupt bit in the status word is also 0, we know the interrupts are
disabled and we can go ahead and clean up the corresponding resources;
otherwise, we must wait until the asynchronous reset has completed.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Suggested-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Tested-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
Link: https://lore.kernel.org/r/20230815184333.6554-3-akrowiak@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Tony Krowiak 2023-08-15 14:43:23 -04:00 committed by Heiko Carstens
parent 680b7ddd7e
commit 7aa7b2a80c
1 changed files with 7 additions and 4 deletions
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11
drivers/s390/crypto/vfio_ap_ops.c
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@ -1654,9 +1654,13 @@ retry_zapq:
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
ret = 0;
/* if the reset has not completed, wait for it to take effect */
if (!status.queue_empty || status.irq_enabled)
if (!status.irq_enabled)
vfio_ap_free_aqic_resources(q);
if (!status.queue_empty || status.irq_enabled) {
ret = apq_reset_check(q);
if (status.irq_enabled && ret == 0)
vfio_ap_free_aqic_resources(q);
}
break;
case AP_RESPONSE_RESET_IN_PROGRESS:
/*
@ -1675,6 +1679,7 @@ retry_zapq:
* completed successfully.
*/
ret = 0;
vfio_ap_free_aqic_resources(q);
break;
default:
WARN(true,
@ -1684,8 +1689,6 @@ retry_zapq:
return -EIO;
}
vfio_ap_free_aqic_resources(q);
return ret;
}