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