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s390/zcrypt: introduce new internal AP queue se_bound attribute

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This patch introduces a new AP queue internal attribute
se_bound which reflects the bound state of an APQN within
a Secure Execution environment.

With introduction of Secure Execution guests now an
AP firmware queue needs to be bound to the guest before
usage. This patch introduces a new internal attribute
reflecting this bound state and some glue code to handle
this new field during lifetime of an AP queue device.

Together with that now the zcrypt scheduler considers
the state of the AP queues when a message is about to be
distributed among the existing queues. There is a new
function ap_queue_usable() which returns true only when
all conditions for using this AP queue device are fulfilled.
In details this means: the AP queue needs to be configured,
not checkstopped and within an SE environment it needs
to be bound. So the new function gives and indication
if the AP queue device is ready to serve requests or not.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Harald Freudenberger
2023-09-12 10:08:51 +02:00
committed by Vasily Gorbik
parent 32d1d9204f
commit a19a161482
3 changed files with 55 additions and 6 deletions
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2
drivers/s390/crypto/ap_bus.h
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@@ -207,6 +207,7 @@ struct ap_queue {
bool chkstop; /* checkstop state */
ap_qid_t qid; /* AP queue id. */
bool interrupt; /* indicate if interrupts are enabled */
bool se_bound; /* SE bound state */
unsigned int assoc_idx; /* SE association index */
int queue_count; /* # messages currently on AP queue. */
int pendingq_count; /* # requests on pendingq list. */
@@ -271,6 +272,7 @@ enum ap_sm_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_sm_event event);
int ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg);
void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg);
void ap_flush_queue(struct ap_queue *aq);
bool ap_queue_usable(struct ap_queue *aq);
void *ap_airq_ptr(void);
int ap_sb_available(void);