arch/x86/kvm/irq.c

   1 /*
   2  * irq.c: API for in kernel interrupt controller
   3  * Copyright (c) 2007, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  * Authors:
  18  *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
  19  *
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kvm_host.h>
  24
  25 #include "irq.h"
  26 #include "i8254.h"
  27
  28 /*
  29  * check if there are pending timer events
  30  * to be processed.
  31  */
  32 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
  33 {
  34         int ret;
  35
  36         ret = pit_has_pending_timer(vcpu);
  37         ret |= apic_has_pending_timer(vcpu);
  38
  39         return ret;
  40 }
  41 EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
  42
  43 /*
  44  * check if there is pending interrupt without
  45  * intack.
  46  */
  47 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  48 {
  49         struct kvm_pic *s;
  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         vector = kvm_get_apic_interrupt(v);     /* APIC */
  71         if (vector == -1) {
  72                 if (kvm_apic_accept_pic_intr(v)) {
  73                         s = pic_irqchip(v->kvm);
  74                         s->output = 0;          /* PIC */
  75                         vector = kvm_pic_read_irq(v->kvm);
  76                 }
  77         }
  78         return vector;
  79 }
  80 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
  81
  82 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
  83 {
  84         kvm_inject_apic_timer_irqs(vcpu);
  85         kvm_inject_pit_timer_irqs(vcpu);
  86         /* TODO: PIT, RTC etc. */
  87 }
  88 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
  89
  90 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
  91 {
  92         __kvm_migrate_apic_timer(vcpu);
  93         __kvm_migrate_pit_timer(vcpu);
  94 }