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 */
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)34 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
35 {
36 return apic_has_pending_timer(vcpu);
37 }
38 EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
39
40 /*
41 * check if there is pending interrupt from
42 * non-APIC source without intack.
43 */
kvm_cpu_has_extint(struct kvm_vcpu * v)44 static 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 */
kvm_cpu_has_injectable_intr(struct kvm_vcpu * v)58 int 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 */
kvm_cpu_has_interrupt(struct kvm_vcpu * v)76 int 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 }
86 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
87
88 /*
89 * Read pending interrupt(from non-APIC source)
90 * vector and intack.
91 */
kvm_cpu_get_extint(struct kvm_vcpu * v)92 static 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 */
kvm_cpu_get_interrupt(struct kvm_vcpu * v)102 int 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 (vector != -1)
112 return vector; /* PIC */
113
114 return kvm_get_apic_interrupt(v); /* APIC */
115 }
116 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
117
kvm_inject_pending_timer_irqs(struct kvm_vcpu * vcpu)118 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
119 {
120 kvm_inject_apic_timer_irqs(vcpu);
121 /* TODO: PIT, RTC etc. */
122 }
123 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
124
__kvm_migrate_timers(struct kvm_vcpu * vcpu)125 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
126 {
127 __kvm_migrate_apic_timer(vcpu);
128 __kvm_migrate_pit_timer(vcpu);
129 }
130