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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2014-12-01 15:55:42 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2015-03-31 21:07:29 +0200
commitb4aec92567f3146167cbc262c686ff73730aa4ca (patch)
treecced47f38169145b3c4ba310ecf24dc3827b3271
parent6d3da241416e6088f83a7ff1f37fb6bb518d9bc8 (diff)
KVM: s390: cpu timer irq priority
We now have a mechanism for delivering interrupts according to their priority. Let's inject them using our new infrastructure (instead of letting only hardware handle them), so we can be sure that the irq priorities are satisfied. For s390, the cpu timer and the clock comparator are to be checked for common code kvm_cpu_has_pending_timer(), although the cpu timer is only stepped when the guest is being executed. 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> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
-rw-r--r--arch/s390/kvm/interrupt.c34
1 files changed, 27 insertions, 7 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 2872fdb4d01a..8a0786ccaf68 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -70,6 +70,26 @@ static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
return 1;
}
+static int ckc_irq_pending(struct kvm_vcpu *vcpu)
+{
+ if (!(vcpu->arch.sie_block->ckc <
+ get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
+ return 0;
+ return ckc_interrupts_enabled(vcpu);
+}
+
+static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
+{
+ return !psw_extint_disabled(vcpu) &&
+ (vcpu->arch.sie_block->gcr[0] & 0x400ul);
+}
+
+static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
+{
+ return (vcpu->arch.sie_block->cputm >> 63) &&
+ cpu_timer_interrupts_enabled(vcpu);
+}
+
static inline int is_ioirq(unsigned long irq_type)
{
return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
@@ -809,12 +829,7 @@ int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
- if (!(vcpu->arch.sie_block->ckc <
- get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
- return 0;
- if (!ckc_interrupts_enabled(vcpu))
- return 0;
- return 1;
+ return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
}
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
@@ -918,9 +933,14 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
/* pending ckc conditions might have been invalidated */
clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
- if (kvm_cpu_has_pending_timer(vcpu))
+ if (ckc_irq_pending(vcpu))
set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
+ /* pending cpu timer conditions might have been invalidated */
+ clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+ if (cpu_timer_irq_pending(vcpu))
+ set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
+
do {
irqs = deliverable_irqs(vcpu);
/* bits are in the order of interrupt priority */

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