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                 s = pic_irqchip(v->kvm);        /* PIC */
  37                 return s->output;
  38         }
  39         return 1;
  40 }
  41 EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
  42
  43 /*
  44  * Read pending interrupt vector and intack.
  45  */
  46 int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
  47 {
  48         struct kvm_pic *s;
  49         int vector;
  50
  51         vector = kvm_get_apic_interrupt(v);     /* APIC */
  52         if (vector == -1) {
  53                 s = pic_irqchip(v->kvm);
  54                 s->output = 0;          /* PIC */
  55                 vector = kvm_pic_read_irq(s);
  56         }
  57         return vector;
  58 }
  59 EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
  60
  61 static void vcpu_kick_intr(void *info)
  62 {
  63 #ifdef DEBUG
  64         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
  65         printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
  66 #endif
  67 }
  68
  69 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
  70 {
  71         int ipi_pcpu = vcpu->cpu;
  72
  73         if (waitqueue_active(&vcpu->wq)) {
  74                 wake_up_interruptible(&vcpu->wq);
  75                 ++vcpu->stat.halt_wakeup;
  76         }
  77         if (vcpu->guest_mode)
  78                 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0, 0);
  79 }
  80
  81 void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
  82 {
  83         kvm_inject_apic_timer_irqs(vcpu);
  84         /* TODO: PIT, RTC etc. */
  85 }
  86 EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);
  87
  88 void kvm_timer_intr_post(struct kvm_vcpu *vcpu, int vec)
  89 {
  90         kvm_apic_timer_intr_post(vcpu, vec);
  91         /* TODO: PIT, RTC etc. */
  92 }
  93 EXPORT_SYMBOL_GPL(kvm_timer_intr_post);