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161 lines
3.6 KiB
161 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* irq.c: API for in kernel interrupt controller |
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* Copyright (c) 2007, Intel Corporation. |
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* Copyright 2009 Red Hat, Inc. and/or its affiliates. |
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* |
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* Authors: |
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* Yaozu (Eddie) Dong <[email protected]> |
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*/ |
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#include <linux/export.h> |
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#include <linux/kvm_host.h> |
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#include "irq.h" |
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#include "i8254.h" |
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#include "x86.h" |
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#include "xen.h" |
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/* |
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* check if there are pending timer events |
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* to be processed. |
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*/ |
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int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) |
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{ |
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if (lapic_in_kernel(vcpu)) |
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return apic_has_pending_timer(vcpu); |
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return 0; |
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} |
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EXPORT_SYMBOL(kvm_cpu_has_pending_timer); |
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/* |
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* check if there is a pending userspace external interrupt |
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*/ |
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static int pending_userspace_extint(struct kvm_vcpu *v) |
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{ |
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return v->arch.pending_external_vector != -1; |
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} |
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/* |
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* check if there is pending interrupt from |
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* non-APIC source without intack. |
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*/ |
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int kvm_cpu_has_extint(struct kvm_vcpu *v) |
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{ |
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/* |
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* FIXME: interrupt.injected represents an interrupt whose |
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* side-effects have already been applied (e.g. bit from IRR |
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* already moved to ISR). Therefore, it is incorrect to rely |
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* on interrupt.injected to know if there is a pending |
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* interrupt in the user-mode LAPIC. |
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* This leads to nVMX/nSVM not be able to distinguish |
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* if it should exit from L2 to L1 on EXTERNAL_INTERRUPT on |
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* pending interrupt or should re-inject an injected |
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* interrupt. |
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*/ |
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if (!lapic_in_kernel(v)) |
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return v->arch.interrupt.injected; |
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if (kvm_xen_has_interrupt(v)) |
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return 1; |
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if (!kvm_apic_accept_pic_intr(v)) |
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return 0; |
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if (irqchip_split(v->kvm)) |
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return pending_userspace_extint(v); |
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else |
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return v->kvm->arch.vpic->output; |
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} |
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/* |
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* check if there is injectable interrupt: |
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* when virtual interrupt delivery enabled, |
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* interrupt from apic will handled by hardware, |
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* we don't need to check it here. |
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*/ |
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int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v) |
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{ |
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if (kvm_cpu_has_extint(v)) |
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return 1; |
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if (!is_guest_mode(v) && kvm_vcpu_apicv_active(v)) |
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return 0; |
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return kvm_apic_has_interrupt(v) != -1; /* LAPIC */ |
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} |
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EXPORT_SYMBOL_GPL(kvm_cpu_has_injectable_intr); |
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/* |
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* check if there is pending interrupt without |
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* intack. |
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*/ |
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int kvm_cpu_has_interrupt(struct kvm_vcpu *v) |
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{ |
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if (kvm_cpu_has_extint(v)) |
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return 1; |
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return kvm_apic_has_interrupt(v) != -1; /* LAPIC */ |
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} |
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EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt); |
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/* |
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* Read pending interrupt(from non-APIC source) |
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* vector and intack. |
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*/ |
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static int kvm_cpu_get_extint(struct kvm_vcpu *v) |
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{ |
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if (!kvm_cpu_has_extint(v)) { |
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WARN_ON(!lapic_in_kernel(v)); |
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return -1; |
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} |
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if (!lapic_in_kernel(v)) |
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return v->arch.interrupt.nr; |
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if (kvm_xen_has_interrupt(v)) |
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return v->kvm->arch.xen.upcall_vector; |
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if (irqchip_split(v->kvm)) { |
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int vector = v->arch.pending_external_vector; |
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v->arch.pending_external_vector = -1; |
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return vector; |
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} else |
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return kvm_pic_read_irq(v->kvm); /* PIC */ |
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} |
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/* |
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* Read pending interrupt vector and intack. |
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*/ |
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int kvm_cpu_get_interrupt(struct kvm_vcpu *v) |
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{ |
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int vector = kvm_cpu_get_extint(v); |
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if (vector != -1) |
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return vector; /* PIC */ |
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return kvm_get_apic_interrupt(v); /* APIC */ |
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} |
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EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt); |
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void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu) |
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{ |
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if (lapic_in_kernel(vcpu)) |
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kvm_inject_apic_timer_irqs(vcpu); |
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} |
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EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs); |
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void __kvm_migrate_timers(struct kvm_vcpu *vcpu) |
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{ |
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__kvm_migrate_apic_timer(vcpu); |
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__kvm_migrate_pit_timer(vcpu); |
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static_call_cond(kvm_x86_migrate_timers)(vcpu); |
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} |
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bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args) |
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{ |
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bool resample = args->flags & KVM_IRQFD_FLAG_RESAMPLE; |
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return resample ? irqchip_kernel(kvm) : irqchip_in_kernel(kvm); |
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}
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