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 #include "x86.h"
  28
  29 /*
  30  * check if there are pending timer events
  31  * to be processed.
  32  */
  33 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
  34 {
  35         int ret;
  36
  37         ret = pit_has_pending_timer(vcpu);
  38         ret |= apic_has_pending_timer(vcpu);
  39
  40         return ret;
  41 }
  42 EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
  43
  44 /*
  45  * check if there is pending interrupt without
  46  * intack.
  47  */
  48 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  49 {
  50         struct kvm_pic *s;
  51
  52         if (!irqchip_in_kernel(v->kvm))
  53                 return v->arch.interrupt.pending;
  54
  55         if (kvm_apic_has_interrupt(v) == -1) {  /* LAPIC */
  56                 if (kvm_apic_accept_pic_intr(v)) {
  57                         s = pic_irqchip(v->kvm);        /* PIC */
  58                         return s->output;
  59                 } else
  60                         return 0;
  61         }
  62         return 1;
  63 }
  64 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
  65
  66 /*
  67  * Read pending interrupt vector and intack.
  68  */
  69 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
  70 {
  71         struct kvm_pic *s;
  72         int vector;
  73
  74         if (!irqchip_in_kernel(v->kvm))
  75                 return v->arch.interrupt.nr;
  76
  77         vector = kvm_get_apic_interrupt(v);     /* APIC */
  78         if (vector == -1) {
  79                 if (kvm_apic_accept_pic_intr(v)) {
  80                         s = pic_irqchip(v->kvm);
  81                         s->output = 0;          /* PIC */
  82                         vector = kvm_pic_read_irq(v->kvm);
  83                 }
  84         }
  85         return vector;
  86 }
  87 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
  88
  89 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
  90 {
  91         kvm_inject_apic_timer_irqs(vcpu);
  92         kvm_inject_pit_timer_irqs(vcpu);
  93         /* TODO: PIT, RTC etc. */
  94 }
  95 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
  96
  97 void __kvm_migrate_timers(struct kvm_vcpu *vcpu)
  98 {
  99         __kvm_migrate_apic_timer(vcpu);
 100         __kvm_migrate_pit_timer(vcpu);
 101 }