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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-05-04 12:38:48 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2015-10-13 15:50:34 +0200
commit238293b14d9b1f5689e2aa68710000b0f25aa612 (patch)
treef67f8367b2c17e22d26e8a5617f868a1f9b1d81d
parentKVM: s390: simplify in-kernel program irq injection (diff)
downloadlinux-238293b14d9b1f5689e2aa68710000b0f25aa612.tar.xz
linux-238293b14d9b1f5689e2aa68710000b0f25aa612.zip
KVM: s390: correctly handle injection of pgm irqs and per events
PER events can always co-exist with other program interrupts. For now, we always overwrite all program interrupt parameters when injecting any type of program interrupt. Let's handle that correctly by only overwriting the relevant portion of the program interrupt parameters. Therefore we can now inject PER events and ordinary program interrupts concurrently, resulting in no loss of program interrupts. This will especially by helpful when manually detecting PER events later - as both types might be triggered during one SIE exit. Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
-rw-r--r--arch/s390/kvm/interrupt.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index f603bacf6ac9..a8be542b9cb0 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -972,7 +972,26 @@ static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
irq->u.pgm.code, 0);
- li->irq.pgm = irq->u.pgm;
+ if (irq->u.pgm.code == PGM_PER) {
+ li->irq.pgm.code |= PGM_PER;
+ /* only modify PER related information */
+ li->irq.pgm.per_address = irq->u.pgm.per_address;
+ li->irq.pgm.per_code = irq->u.pgm.per_code;
+ li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
+ li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
+ } else if (!(irq->u.pgm.code & PGM_PER)) {
+ li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
+ irq->u.pgm.code;
+ /* only modify non-PER information */
+ li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
+ li->irq.pgm.mon_code = irq->u.pgm.mon_code;
+ li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
+ li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
+ li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
+ li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
+ } else {
+ li->irq.pgm = irq->u.pgm;
+ }
set_bit(IRQ_PEND_PROG, &li->pending_irqs);
return 0;
}