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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.
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>
24#include <linux/kvm_host.h>
25
26#include "irq.h"
27#include "i8254.h"
28#include "x86.h"
29
30/*
31 * check if there are pending timer events
32 * to be processed.
33 */
34int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
35{
36 return apic_has_pending_timer(vcpu);
37}
38EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
39
40/*
41 * check if there is pending interrupt from
42 * non-APIC source without intack.
43 */
44static int kvm_cpu_has_extint(struct kvm_vcpu *v)
45{
46 if (kvm_apic_accept_pic_intr(v))
47 return pic_irqchip(v->kvm)->output; /* PIC */
48 else
49 return 0;
50}
51
52/*
53 * check if there is injectable interrupt:
54 * when virtual interrupt delivery enabled,
55 * interrupt from apic will handled by hardware,
56 * we don't need to check it here.
57 */
58int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
59{
60 if (!irqchip_in_kernel(v->kvm))
61 return v->arch.interrupt.pending;
62
63 if (kvm_cpu_has_extint(v))
64 return 1;
65
66 if (kvm_apic_vid_enabled(v->kvm))
67 return 0;
68
69 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
70}
71
72/*
73 * check if there is pending interrupt without
74 * intack.
75 */
76int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
77{
78 if (!irqchip_in_kernel(v->kvm))
79 return v->arch.interrupt.pending;
80
81 if (kvm_cpu_has_extint(v))
82 return 1;
83
84 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
85}
86EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
87
88/*
89 * Read pending interrupt(from non-APIC source)
90 * vector and intack.
91 */
92static int kvm_cpu_get_extint(struct kvm_vcpu *v)
93{
94 if (kvm_cpu_has_extint(v))
95 return kvm_pic_read_irq(v->kvm); /* PIC */
96 return -1;
97}
98
99/*
100 * Read pending interrupt vector and intack.
101 */
102int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
103{
104 int vector;
105
106 if (!irqchip_in_kernel(v->kvm))
107 return v->arch.interrupt.nr;
108
109 vector = kvm_cpu_get_extint(v);
110
111 if (kvm_apic_vid_enabled(v->kvm) || vector != -1)
112 return vector; /* PIC */
113
114 return kvm_get_apic_interrupt(v); /* APIC */
115}
116
117void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
118{
119 kvm_inject_apic_timer_irqs(vcpu);
120 /* TODO: PIT, RTC etc. */
121}
122EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
123
124void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
125{
126 __kvm_migrate_apic_timer(vcpu);
127 __kvm_migrate_pit_timer(vcpu);
128}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * irq.c: API for in kernel interrupt controller
4 * Copyright (c) 2007, Intel Corporation.
5 * Copyright 2009 Red Hat, Inc. and/or its affiliates.
6 *
7 * Authors:
8 * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
9 */
10
11#include <linux/export.h>
12#include <linux/kvm_host.h>
13
14#include "irq.h"
15#include "i8254.h"
16#include "x86.h"
17#include "xen.h"
18
19/*
20 * check if there are pending timer events
21 * to be processed.
22 */
23int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
24{
25 int r = 0;
26
27 if (lapic_in_kernel(vcpu))
28 r = apic_has_pending_timer(vcpu);
29 if (kvm_xen_timer_enabled(vcpu))
30 r += kvm_xen_has_pending_timer(vcpu);
31
32 return r;
33}
34
35/*
36 * check if there is a pending userspace external interrupt
37 */
38static int pending_userspace_extint(struct kvm_vcpu *v)
39{
40 return v->arch.pending_external_vector != -1;
41}
42
43/*
44 * check if there is pending interrupt from
45 * non-APIC source without intack.
46 */
47int kvm_cpu_has_extint(struct kvm_vcpu *v)
48{
49 /*
50 * FIXME: interrupt.injected represents an interrupt whose
51 * side-effects have already been applied (e.g. bit from IRR
52 * already moved to ISR). Therefore, it is incorrect to rely
53 * on interrupt.injected to know if there is a pending
54 * interrupt in the user-mode LAPIC.
55 * This leads to nVMX/nSVM not be able to distinguish
56 * if it should exit from L2 to L1 on EXTERNAL_INTERRUPT on
57 * pending interrupt or should re-inject an injected
58 * interrupt.
59 */
60 if (!lapic_in_kernel(v))
61 return v->arch.interrupt.injected;
62
63 if (kvm_xen_has_interrupt(v))
64 return 1;
65
66 if (!kvm_apic_accept_pic_intr(v))
67 return 0;
68
69 if (irqchip_split(v->kvm))
70 return pending_userspace_extint(v);
71 else
72 return v->kvm->arch.vpic->output;
73}
74
75/*
76 * check if there is injectable interrupt:
77 * when virtual interrupt delivery enabled,
78 * interrupt from apic will handled by hardware,
79 * we don't need to check it here.
80 */
81int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
82{
83 if (kvm_cpu_has_extint(v))
84 return 1;
85
86 if (!is_guest_mode(v) && kvm_vcpu_apicv_active(v))
87 return 0;
88
89 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
90}
91EXPORT_SYMBOL_GPL(kvm_cpu_has_injectable_intr);
92
93/*
94 * check if there is pending interrupt without
95 * intack.
96 */
97int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
98{
99 if (kvm_cpu_has_extint(v))
100 return 1;
101
102 return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
103}
104EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
105
106/*
107 * Read pending interrupt(from non-APIC source)
108 * vector and intack.
109 */
110static int kvm_cpu_get_extint(struct kvm_vcpu *v)
111{
112 if (!kvm_cpu_has_extint(v)) {
113 WARN_ON(!lapic_in_kernel(v));
114 return -1;
115 }
116
117 if (!lapic_in_kernel(v))
118 return v->arch.interrupt.nr;
119
120 if (kvm_xen_has_interrupt(v))
121 return v->kvm->arch.xen.upcall_vector;
122
123 if (irqchip_split(v->kvm)) {
124 int vector = v->arch.pending_external_vector;
125
126 v->arch.pending_external_vector = -1;
127 return vector;
128 } else
129 return kvm_pic_read_irq(v->kvm); /* PIC */
130}
131
132/*
133 * Read pending interrupt vector and intack.
134 */
135int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
136{
137 int vector = kvm_cpu_get_extint(v);
138 if (vector != -1)
139 return vector; /* PIC */
140
141 return kvm_get_apic_interrupt(v); /* APIC */
142}
143EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
144
145void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
146{
147 if (lapic_in_kernel(vcpu))
148 kvm_inject_apic_timer_irqs(vcpu);
149 if (kvm_xen_timer_enabled(vcpu))
150 kvm_xen_inject_timer_irqs(vcpu);
151}
152
153void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
154{
155 __kvm_migrate_apic_timer(vcpu);
156 __kvm_migrate_pit_timer(vcpu);
157 static_call_cond(kvm_x86_migrate_timers)(vcpu);
158}
159
160bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args)
161{
162 bool resample = args->flags & KVM_IRQFD_FLAG_RESAMPLE;
163
164 return resample ? irqchip_kernel(kvm) : irqchip_in_kernel(kvm);
165}
166
167bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
168{
169 return irqchip_in_kernel(kvm);
170}