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- Fix zcrypt ioctl hang due to AP queue msg counter dropping below 0 when

Browse source 
pending requests are purged.
 
 - Two fixes for the machine check handler in the entry code.
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Merge tag 's390-5.13-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - Fix zcrypt ioctl hang due to AP queue msg counter dropping below 0
   when pending requests are purged.

 - Two fixes for the machine check handler in the entry code.

* tag 's390-5.13-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/ap: Fix hanging ioctl caused by wrong msg counter
  s390/mcck: fix invalid KVM guest condition check
  s390/mcck: fix calculation of SIE critical section size
This commit is contained in:
Linus Torvalds 2021-06-19 08:39:13 -07:00
commit e14c779ade
2 changed files with 11 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/s390/kernel/entry.S
View file

@ -651,9 +651,9 @@ ENDPROC(stack_overflow)
.Lcleanup_sie_mcck:
larl %r13,.Lsie_entry
slgr %r9,%r13
larl %r13,.Lsie_skip
lghi %r13,.Lsie_skip - .Lsie_entry
clgr %r9,%r13
jh .Lcleanup_sie_int
jhe .Lcleanup_sie_int
oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
.Lcleanup_sie_int:
BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)

11
drivers/s390/crypto/ap_queue.c
View file

@ -135,12 +135,13 @@ static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
{
struct ap_queue_status status;
struct ap_message *ap_msg;
bool found = false;
status = ap_dqap(aq->qid, &aq->reply->psmid,
aq->reply->msg, aq->reply->len);
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
aq->queue_count--;
aq->queue_count = max_t(int, 0, aq->queue_count - 1);
if (aq->queue_count > 0)
mod_timer(&aq->timeout,
jiffies + aq->request_timeout);
@ -150,8 +151,14 @@ static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
list_del_init(&ap_msg->list);
aq->pendingq_count--;
ap_msg->receive(aq, ap_msg, aq->reply);
found = true;
break;
}
if (!found) {
AP_DBF_WARN("%s unassociated reply psmid=0x%016llx on 0x%02x.%04x\n",
__func__, aq->reply->psmid,
AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
}
fallthrough;
case AP_RESPONSE_NO_PENDING_REPLY:
if (!status.queue_empty || aq->queue_count <= 0)
@ -232,7 +239,7 @@ static enum ap_sm_wait ap_sm_write(struct ap_queue *aq)
ap_msg->flags & AP_MSG_FLAG_SPECIAL);
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
aq->queue_count++;
aq->queue_count = max_t(int, 1, aq->queue_count + 1);
if (aq->queue_count == 1)
mod_timer(&aq->timeout, jiffies + aq->request_timeout);
list_move_tail(&ap_msg->list, &aq->pendingq);