Linux 4.6-rc6
[linux/fpc-iii.git] / arch / x86 / kvm / irq.c
blob95fcc7b13866c8af1535edd2b8d66728448dc506
1 /*
2 * irq.c: API for in kernel interrupt controller
3 * Copyright (c) 2007, Intel Corporation.
4 * Copyright 2009 Red Hat, Inc. and/or its affiliates.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
17 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Authors:
19 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
23 #include <linux/module.h>
24 #include <linux/kvm_host.h>
26 #include "irq.h"
27 #include "i8254.h"
28 #include "x86.h"
31 * check if there are pending timer events
32 * to be processed.
34 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
36 if (lapic_in_kernel(vcpu))
37 return apic_has_pending_timer(vcpu);
39 return 0;
41 EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
44 * check if there is a pending userspace external interrupt
46 static int pending_userspace_extint(struct kvm_vcpu *v)
48 return v->arch.pending_external_vector != -1;
52 * check if there is pending interrupt from
53 * non-APIC source without intack.
55 static int kvm_cpu_has_extint(struct kvm_vcpu *v)
57 u8 accept = kvm_apic_accept_pic_intr(v);
59 if (accept) {
60 if (irqchip_split(v->kvm))
61 return pending_userspace_extint(v);
62 else
63 return pic_irqchip(v->kvm)->output;
64 } else
65 return 0;
69 * check if there is injectable interrupt:
70 * when virtual interrupt delivery enabled,
71 * interrupt from apic will handled by hardware,
72 * we don't need to check it here.
74 int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
76 if (!lapic_in_kernel(v))
77 return v->arch.interrupt.pending;
79 if (kvm_cpu_has_extint(v))
80 return 1;
82 if (kvm_vcpu_apicv_active(v))
83 return 0;
85 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
89 * check if there is pending interrupt without
90 * intack.
92 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
94 if (!lapic_in_kernel(v))
95 return v->arch.interrupt.pending;
97 if (kvm_cpu_has_extint(v))
98 return 1;
100 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
102 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
105 * Read pending interrupt(from non-APIC source)
106 * vector and intack.
108 static int kvm_cpu_get_extint(struct kvm_vcpu *v)
110 if (kvm_cpu_has_extint(v)) {
111 if (irqchip_split(v->kvm)) {
112 int vector = v->arch.pending_external_vector;
114 v->arch.pending_external_vector = -1;
115 return vector;
116 } else
117 return kvm_pic_read_irq(v->kvm); /* PIC */
118 } else
119 return -1;
123 * Read pending interrupt vector and intack.
125 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
127 int vector;
129 if (!lapic_in_kernel(v))
130 return v->arch.interrupt.nr;
132 vector = kvm_cpu_get_extint(v);
134 if (vector != -1)
135 return vector; /* PIC */
137 return kvm_get_apic_interrupt(v); /* APIC */
139 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
141 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
143 if (lapic_in_kernel(vcpu))
144 kvm_inject_apic_timer_irqs(vcpu);
146 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
148 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
150 __kvm_migrate_apic_timer(vcpu);
151 __kvm_migrate_pit_timer(vcpu);