diff options
Diffstat (limited to 'virt/kvm/ioapic.c')
| -rw-r--r-- | virt/kvm/ioapic.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index a49fcd5..97c67a5 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -147,6 +147,22 @@ static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic) __rtc_irq_eoi_tracking_restore_one(vcpu); } +static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu) +{ + if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) + --ioapic->rtc_status.pending_eoi; + + WARN_ON(ioapic->rtc_status.pending_eoi < 0); +} + +static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic) +{ + if (ioapic->rtc_status.pending_eoi > 0) + return true; /* coalesced */ + + return false; +} + static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx, bool line_status) { @@ -260,6 +276,7 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status) { union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; struct kvm_lapic_irq irqe; + int ret; ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " "vector=%x trig_mode=%x\n", @@ -275,7 +292,15 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status) irqe.level = 1; irqe.shorthand = 0; - return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); + if (irq == RTC_GSI && line_status) { + BUG_ON(ioapic->rtc_status.pending_eoi != 0); + ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, + ioapic->rtc_status.dest_map); + ioapic->rtc_status.pending_eoi = ret; + } else + ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); + + return ret; } int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, @@ -299,6 +324,12 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, ret = 1; } else { int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG); + + if (irq == RTC_GSI && line_status && + rtc_irq_check_coalesced(ioapic)) { + ret = 0; /* coalesced */ + goto out; + } ioapic->irr |= mask; if ((edge && old_irr != ioapic->irr) || (!edge && !entry.fields.remote_irr)) @@ -306,6 +337,7 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, else ret = 0; /* report coalesced interrupt */ } +out: trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0); spin_unlock(&ioapic->lock); @@ -333,6 +365,8 @@ static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, if (ent->fields.vector != vector) continue; + if (i == RTC_GSI) + rtc_irq_eoi(ioapic, vcpu); /* * We are dropping lock while calling ack notifiers because ack * notifier callbacks for assigned devices call into IOAPIC |
