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85f455f7 ED |
1 | /* |
2 | * irq.c: API for in kernel interrupt controller | |
3 | * Copyright (c) 2007, Intel Corporation. | |
9611c187 | 4 | * Copyright 2009 Red Hat, Inc. and/or its affiliates. |
85f455f7 ED |
5 | * |
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. | |
9 | * | |
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. | |
14 | * | |
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> | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
edf88417 | 24 | #include <linux/kvm_host.h> |
85f455f7 | 25 | |
85f455f7 | 26 | #include "irq.h" |
7837699f | 27 | #include "i8254.h" |
8061823a | 28 | #include "x86.h" |
85f455f7 | 29 | |
3d80840d MT |
30 | /* |
31 | * check if there are pending timer events | |
32 | * to be processed. | |
33 | */ | |
34 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
35 | { | |
23e7a794 | 36 | return apic_has_pending_timer(vcpu); |
3d80840d MT |
37 | } |
38 | EXPORT_SYMBOL(kvm_cpu_has_pending_timer); | |
39 | ||
1c1a9ce9 SR |
40 | /* |
41 | * check if there is a pending userspace external interrupt | |
42 | */ | |
43 | static int pending_userspace_extint(struct kvm_vcpu *v) | |
44 | { | |
45 | return v->arch.pending_external_vector != -1; | |
46 | } | |
47 | ||
c7c9c56c YZ |
48 | /* |
49 | * check if there is pending interrupt from | |
50 | * non-APIC source without intack. | |
51 | */ | |
52 | static int kvm_cpu_has_extint(struct kvm_vcpu *v) | |
53 | { | |
1c1a9ce9 SR |
54 | u8 accept = kvm_apic_accept_pic_intr(v); |
55 | ||
56 | if (accept) { | |
57 | if (irqchip_split(v->kvm)) | |
58 | return pending_userspace_extint(v); | |
59 | else | |
60 | return pic_irqchip(v->kvm)->output; | |
61 | } else | |
c7c9c56c YZ |
62 | return 0; |
63 | } | |
64 | ||
65 | /* | |
66 | * check if there is injectable interrupt: | |
67 | * when virtual interrupt delivery enabled, | |
68 | * interrupt from apic will handled by hardware, | |
69 | * we don't need to check it here. | |
70 | */ | |
71 | int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v) | |
72 | { | |
35754c98 | 73 | if (!lapic_in_kernel(v)) |
c7c9c56c YZ |
74 | return v->arch.interrupt.pending; |
75 | ||
76 | if (kvm_cpu_has_extint(v)) | |
77 | return 1; | |
78 | ||
d50ab6c1 | 79 | if (kvm_vcpu_apic_vid_enabled(v)) |
c7c9c56c YZ |
80 | return 0; |
81 | ||
82 | return kvm_apic_has_interrupt(v) != -1; /* LAPIC */ | |
83 | } | |
84 | ||
85f455f7 ED |
85 | /* |
86 | * check if there is pending interrupt without | |
87 | * intack. | |
88 | */ | |
89 | int kvm_cpu_has_interrupt(struct kvm_vcpu *v) | |
90 | { | |
35754c98 | 91 | if (!lapic_in_kernel(v)) |
923c61bb | 92 | return v->arch.interrupt.pending; |
8061823a | 93 | |
c7c9c56c YZ |
94 | if (kvm_cpu_has_extint(v)) |
95 | return 1; | |
f3200d00 GN |
96 | |
97 | return kvm_apic_has_interrupt(v) != -1; /* LAPIC */ | |
85f455f7 ED |
98 | } |
99 | EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt); | |
100 | ||
c7c9c56c YZ |
101 | /* |
102 | * Read pending interrupt(from non-APIC source) | |
103 | * vector and intack. | |
104 | */ | |
105 | static int kvm_cpu_get_extint(struct kvm_vcpu *v) | |
106 | { | |
1c1a9ce9 SR |
107 | if (kvm_cpu_has_extint(v)) { |
108 | if (irqchip_split(v->kvm)) { | |
109 | int vector = v->arch.pending_external_vector; | |
110 | ||
111 | v->arch.pending_external_vector = -1; | |
112 | return vector; | |
113 | } else | |
114 | return kvm_pic_read_irq(v->kvm); /* PIC */ | |
115 | } else | |
116 | return -1; | |
c7c9c56c YZ |
117 | } |
118 | ||
85f455f7 ED |
119 | /* |
120 | * Read pending interrupt vector and intack. | |
121 | */ | |
122 | int kvm_cpu_get_interrupt(struct kvm_vcpu *v) | |
123 | { | |
c7c9c56c YZ |
124 | int vector; |
125 | ||
35754c98 | 126 | if (!lapic_in_kernel(v)) |
923c61bb | 127 | return v->arch.interrupt.nr; |
8061823a | 128 | |
c7c9c56c YZ |
129 | vector = kvm_cpu_get_extint(v); |
130 | ||
56cc2406 | 131 | if (vector != -1) |
c7c9c56c | 132 | return vector; /* PIC */ |
f3200d00 GN |
133 | |
134 | return kvm_get_apic_interrupt(v); /* APIC */ | |
85f455f7 | 135 | } |
77b0f5d6 | 136 | EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt); |
97222cc8 | 137 | |
1b9778da ED |
138 | void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu) |
139 | { | |
140 | kvm_inject_apic_timer_irqs(vcpu); | |
141 | /* TODO: PIT, RTC etc. */ | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs); | |
144 | ||
2f599714 MT |
145 | void __kvm_migrate_timers(struct kvm_vcpu *vcpu) |
146 | { | |
147 | __kvm_migrate_apic_timer(vcpu); | |
148 | __kvm_migrate_pit_timer(vcpu); | |
149 | } |