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 without
42 * intack.
43 */
kvm_cpu_has_interrupt(struct kvm_vcpu * v)44 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
45 {
46 struct kvm_pic *s;
47
48 if (!irqchip_in_kernel(v->kvm))
49 return v->arch.interrupt.pending;
50
51 if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
52 if (kvm_apic_accept_pic_intr(v)) {
53 s = pic_irqchip(v->kvm); /* PIC */
54 return s->output;
55 } else
56 return 0;
57 }
58 return 1;
59 }
60 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
61
62 /*
63 * Read pending interrupt vector and intack.
64 */
kvm_cpu_get_interrupt(struct kvm_vcpu * v)65 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
66 {
67 struct kvm_pic *s;
68 int vector;
69
70 if (!irqchip_in_kernel(v->kvm))
71 return v->arch.interrupt.nr;
72
73 vector = kvm_get_apic_interrupt(v); /* APIC */
74 if (vector == -1) {
75 if (kvm_apic_accept_pic_intr(v)) {
76 s = pic_irqchip(v->kvm);
77 s->output = 0; /* PIC */
78 vector = kvm_pic_read_irq(v->kvm);
79 }
80 }
81 return vector;
82 }
83 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
84
kvm_inject_pending_timer_irqs(struct kvm_vcpu * vcpu)85 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
86 {
87 kvm_inject_apic_timer_irqs(vcpu);
88 /* TODO: PIT, RTC etc. */
89 }
90 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
91
__kvm_migrate_timers(struct kvm_vcpu * vcpu)92 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
93 {
94 __kvm_migrate_apic_timer(vcpu);
95 __kvm_migrate_pit_timer(vcpu);
96 }
97