b111aee815f811b60806c8e4849ece5daae04fdb
[linux-3.10.git] / arch / x86 / kvm / irq.c
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  */
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  */
44 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
45 {
46         if (!irqchip_in_kernel(v->kvm))
47                 return v->arch.interrupt.pending;
48
49         if (kvm_apic_accept_pic_intr(v) && pic_irqchip(v->kvm)->output)
50                 return pic_irqchip(v->kvm)->output;     /* PIC */
51
52         return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
53 }
54 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
55
56 /*
57  * Read pending interrupt vector and intack.
58  */
59 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
60 {
61         if (!irqchip_in_kernel(v->kvm))
62                 return v->arch.interrupt.nr;
63
64         if (kvm_apic_accept_pic_intr(v) && pic_irqchip(v->kvm)->output)
65                 return kvm_pic_read_irq(v->kvm);        /* PIC */
66
67         return kvm_get_apic_interrupt(v);       /* APIC */
68 }
69 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
70
71 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
72 {
73         kvm_inject_apic_timer_irqs(vcpu);
74         /* TODO: PIT, RTC etc. */
75 }
76 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
77
78 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
79 {
80         __kvm_migrate_apic_timer(vcpu);
81         __kvm_migrate_pit_timer(vcpu);
82 }