From 4925663a079c77d95d8685228ad6675fc5639c8e Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Wed, 4 Feb 2009 17:28:14 +0200 Subject: KVM: Report IRQ injection status to userspace. IRQ injection status is either -1 (if there was no CPU found that should except the interrupt because IRQ was masked or ioapic was misconfigured or ...) or >= 0 in that case the number indicates to how many CPUs interrupt was injected. If the value is 0 it means that the interrupt was coalesced and probably should be reinjected. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity --- virt/kvm/ioapic.c | 23 ++++++++++++++++------- virt/kvm/ioapic.h | 2 +- virt/kvm/irq_comm.c | 41 ++++++++++++++++++++++++++++------------- 3 files changed, 45 insertions(+), 21 deletions(-) (limited to 'virt') diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 1c986ac59ad..c3b99def9cb 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -83,19 +83,22 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic, return result; } -static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx) +static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx) { union ioapic_redir_entry *pent; + int injected = -1; pent = &ioapic->redirtbl[idx]; if (!pent->fields.mask) { - int injected = ioapic_deliver(ioapic, idx); + injected = ioapic_deliver(ioapic, idx); if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG) pent->fields.remote_irr = 1; } if (!pent->fields.trig_mode) ioapic->irr &= ~(1 << idx); + + return injected; } static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) @@ -207,7 +210,7 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) u8 trig_mode = ioapic->redirtbl[irq].fields.trig_mode; u32 deliver_bitmask; struct kvm_vcpu *vcpu; - int vcpu_id, r = 0; + int vcpu_id, r = -1; ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " "vector=%x trig_mode=%x\n", @@ -247,7 +250,9 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) deliver_bitmask &= ~(1 << vcpu_id); vcpu = ioapic->kvm->vcpus[vcpu_id]; if (vcpu) { - r = ioapic_inj_irq(ioapic, vcpu, vector, + if (r < 0) + r = 0; + r += ioapic_inj_irq(ioapic, vcpu, vector, trig_mode, delivery_mode); } } @@ -258,8 +263,10 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) continue; deliver_bitmask &= ~(1 << vcpu_id); vcpu = ioapic->kvm->vcpus[vcpu_id]; - if (vcpu) + if (vcpu) { ioapic_inj_nmi(vcpu); + r = 1; + } else ioapic_debug("NMI to vcpu %d failed\n", vcpu->vcpu_id); @@ -273,11 +280,12 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) return r; } -void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level) +int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level) { u32 old_irr = ioapic->irr; u32 mask = 1 << irq; union ioapic_redir_entry entry; + int ret = 1; if (irq >= 0 && irq < IOAPIC_NUM_PINS) { entry = ioapic->redirtbl[irq]; @@ -288,9 +296,10 @@ void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level) ioapic->irr |= mask; if ((!entry.fields.trig_mode && old_irr != ioapic->irr) || !entry.fields.remote_irr) - ioapic_service(ioapic, irq); + ret = ioapic_service(ioapic, irq); } } + return ret; } static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int pin, diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h index 49c9581d258..a34bd5e6436 100644 --- a/virt/kvm/ioapic.h +++ b/virt/kvm/ioapic.h @@ -83,7 +83,7 @@ struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector, unsigned long bitmap); void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode); int kvm_ioapic_init(struct kvm *kvm); -void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level); +int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level); void kvm_ioapic_reset(struct kvm_ioapic *ioapic); u32 kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest, u8 dest_mode); diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 6bc7439eff6..be8aba79155 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -29,22 +29,24 @@ #include "ioapic.h" -static void kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm, int level) +static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) { #ifdef CONFIG_X86 - kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); + return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); +#else + return -1; #endif } -static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm, int level) +static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) { - kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); + return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); } -static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm, int level) +static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) { int vcpu_id; struct kvm_vcpu *vcpu; @@ -88,13 +90,20 @@ static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, default: break; } + return 1; } -/* This should be called with the kvm->lock mutex held */ -void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) +/* This should be called with the kvm->lock mutex held + * Return value: + * < 0 Interrupt was ignored (masked or not delivered for other reasons) + * = 0 Interrupt was coalesced (previous irq is still pending) + * > 0 Number of CPUs interrupt was delivered to + */ +int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) { struct kvm_kernel_irq_routing_entry *e; unsigned long *irq_state, sig_level; + int ret = -1; if (irq < KVM_IOAPIC_NUM_PINS) { irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; @@ -113,8 +122,14 @@ void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) * writes to the unused one. */ list_for_each_entry(e, &kvm->irq_routing, link) - if (e->gsi == irq) - e->set(e, kvm, sig_level); + if (e->gsi == irq) { + int r = e->set(e, kvm, sig_level); + if (r < 0) + continue; + + ret = r + ((ret < 0) ? 0 : ret); + } + return ret; } void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) @@ -232,7 +247,7 @@ int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, e->set = kvm_set_pic_irq; break; case KVM_IRQCHIP_PIC_SLAVE: - e->set = kvm_set_pic_irq; + e->set = kvm_set_pic_irq; delta = 8; break; case KVM_IRQCHIP_IOAPIC: -- cgit v1.2.3