From c7c9c56ca26f7b9458711b2d78b60b60e0d38ba7 Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 25 Jan 2013 10:18:51 +0800 Subject: x86, apicv: add virtual interrupt delivery support Virtual interrupt delivery avoids KVM to inject vAPIC interrupts manually, which is fully taken care of by the hardware. This needs some special awareness into existing interrupr injection path: - for pending interrupt, instead of direct injection, we may need update architecture specific indicators before resuming to guest. - A pending interrupt, which is masked by ISR, should be also considered in above update action, since hardware will decide when to inject it at right time. Current has_interrupt and get_interrupt only returns a valid vector from injection p.o.v. Reviewed-by: Marcelo Tosatti Signed-off-by: Kevin Tian Signed-off-by: Yang Zhang Signed-off-by: Gleb Natapov --- virt/kvm/ioapic.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) (limited to 'virt/kvm/ioapic.c') diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index f3abbef46c42..ce82b9401958 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -115,6 +116,42 @@ static void update_handled_vectors(struct kvm_ioapic *ioapic) smp_wmb(); } +void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu, + u64 *eoi_exit_bitmap) +{ + struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; + union kvm_ioapic_redirect_entry *e; + struct kvm_lapic_irq irqe; + int index; + + spin_lock(&ioapic->lock); + /* traverse ioapic entry to set eoi exit bitmap*/ + for (index = 0; index < IOAPIC_NUM_PINS; index++) { + e = &ioapic->redirtbl[index]; + if (!e->fields.mask && + (e->fields.trig_mode == IOAPIC_LEVEL_TRIG || + kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, + index))) { + irqe.dest_id = e->fields.dest_id; + irqe.vector = e->fields.vector; + irqe.dest_mode = e->fields.dest_mode; + irqe.delivery_mode = e->fields.delivery_mode << 8; + kvm_calculate_eoi_exitmap(vcpu, &irqe, eoi_exit_bitmap); + } + } + spin_unlock(&ioapic->lock); +} +EXPORT_SYMBOL_GPL(kvm_ioapic_calculate_eoi_exitmap); + +void kvm_ioapic_make_eoibitmap_request(struct kvm *kvm) +{ + struct kvm_ioapic *ioapic = kvm->arch.vioapic; + + if (!kvm_apic_vid_enabled(kvm) || !ioapic) + return; + kvm_make_update_eoibitmap_request(kvm); +} + static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) { unsigned index; @@ -156,6 +193,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG && ioapic->irr & (1 << index)) ioapic_service(ioapic, index); + kvm_ioapic_make_eoibitmap_request(ioapic->kvm); break; } } @@ -455,6 +493,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) spin_lock(&ioapic->lock); memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); update_handled_vectors(ioapic); + kvm_ioapic_make_eoibitmap_request(kvm); spin_unlock(&ioapic->lock); return 0; } -- cgit v1.2.1