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s390/zcrypt: externalize AP queue interrupt control

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KVM has a need to control the interrupts on real and virtualized
AP queue devices. This fix provides a new function to control
the interrupt facilities of an AP queue device.

Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Harald Freudenberger
2016-11-09 15:00:23 +01:00
committed by Martin Schwidefsky
parent 050349b5b7
commit 46fde9a9d2
3 changed files with 65 additions and 4 deletions
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9
drivers/s390/crypto/ap_asm.h
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@@ -69,16 +69,19 @@ static inline struct ap_queue_status ap_rapq(ap_qid_t qid)
}
/**
* ap_aqic(): Enable interruption for a specific AP.
* ap_aqic(): Control interruption for a specific AP.
* @qid: The AP queue number
* @qirqctrl: struct ap_qirq_ctrl (64 bit value)
* @ind: The notification indicator byte
*
* Returns AP queue status.
*/
static inline struct ap_queue_status ap_aqic(ap_qid_t qid, void *ind)
static inline struct ap_queue_status ap_aqic(ap_qid_t qid,
struct ap_qirq_ctrl qirqctrl,
void *ind)
{
register unsigned long reg0 asm ("0") = qid | (3UL << 24);
register unsigned long reg1_in asm ("1") = (8UL << 44) | AP_ISC;
register struct ap_qirq_ctrl reg1_in asm ("1") = qirqctrl;
register struct ap_queue_status reg1_out asm ("1");
register void *reg2 asm ("2") = ind;