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s390/ap/zcrypt: Rework AP message buffer allocation

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Slight rework on the way how AP message buffers are allocated.
Instead of having multiple places with kmalloc() calls all
the AP message buffers are now allocated and freed on exactly
one place: ap_init_apmsg() allocates the current AP bus max
limit of ap_max_msg_size (defaults to 12KB). The AP message
buffer is then freed in ap_release_apmsg().

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Link: https://lore.kernel.org/r/20250424133619.16495-3-freude@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Harald Freudenberger
2025-04-24 15:35:56 +02:00
committed by Heiko Carstens
parent 43435495a0
commit 57db62a130
5 changed files with 87 additions and 66 deletions
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26
drivers/s390/crypto/ap_bus.c
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@@ -547,6 +547,32 @@ static void ap_poll_thread_stop(void)
#define is_card_dev(x) ((x)->parent == ap_root_device)
#define is_queue_dev(x) ((x)->parent != ap_root_device)
/*
* ap_init_apmsg() - Initialize ap_message.
*/
int ap_init_apmsg(struct ap_message *ap_msg)
{
unsigned int maxmsgsize = atomic_read(&ap_max_msg_size);
memset(ap_msg, 0, sizeof(*ap_msg));
ap_msg->msg = kmalloc(maxmsgsize, GFP_KERNEL);
if (!ap_msg->msg)
return -ENOMEM;
ap_msg->bufsize = maxmsgsize;
return 0;
}
EXPORT_SYMBOL(ap_init_apmsg);
/*
* ap_release_apmsg() - Release ap_message.
*/
void ap_release_apmsg(struct ap_message *ap_msg)
{
kfree_sensitive(ap_msg->msg);
}
EXPORT_SYMBOL(ap_release_apmsg);
/**
* ap_bus_match()
* @dev: Pointer to device