drivers/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
  24 #include "kvm.h"
  25 #include "x86.h"
  26 #include "irq.h"
  27
  28 /*
  29  * check if there is pending interrupt without
  30  * intack.
  31  */
  32 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
  33 {
  34         struct kvm_pic *s;
  35
  36         if (kvm_apic_has_interrupt(v) == -1) {  /* LAPIC */
  37                 if (kvm_apic_accept_pic_intr(v)) {
  38                         s = pic_irqchip(v->kvm);        /* PIC */
  39                         return s->output;
  40                 } else
  41                         return 0;
  42         }
  43         return 1;
  44 }
  45 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
  46
  47 /*
  48  * Read pending interrupt vector and intack.
  49  */
  50 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
  51 {
  52         struct kvm_pic *s;
  53         int vector;
  54
  55         vector = kvm_get_apic_interrupt(v);     /* APIC */
  56         if (vector == -1) {
  57                 if (kvm_apic_accept_pic_intr(v)) {
  58                         s = pic_irqchip(v->kvm);
  59                         s->output = 0;          /* PIC */
  60                         vector = kvm_pic_read_irq(s);
  61                 }
  62         }
  63         return vector;
  64 }
  65 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
  66
  67 static void vcpu_kick_intr(void *info)
  68 {
  69 #ifdef DEBUG
  70         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
  71         printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
  72 #endif
  73 }
  74
  75 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
  76 {
  77         int ipi_pcpu = vcpu->cpu;
  78
  79         if (waitqueue_active(&vcpu->wq)) {
  80                 wake_up_interruptible(&vcpu->wq);
  81                 ++vcpu->stat.halt_wakeup;
  82         }
  83         if (vcpu->guest_mode)
  84                 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
  85 }
  86
  87 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
  88 {
  89         kvm_inject_apic_timer_irqs(vcpu);
  90         /* TODO: PIT, RTC etc. */
  91 }
  92 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
  93
  94 void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
  95 {
  96         kvm_apic_timer_intr_post(vcpu, vec);
  97         /* TODO: PIT, RTC etc. */
  98 }
  99 EXPORT_SYMBOL_GPL(kvm_timer_intr_post);