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         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  */
  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
  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
  92 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
  93 {
  94         __kvm_migrate_apic_timer(vcpu);
  95         __kvm_migrate_pit_timer(vcpu);
  96 }