virt/kvm/irq_comm.c

   1 /*
   2  * irq_comm.c: Common 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/kvm_host.h>
  23 #include "irq.h"
  24
  25 #include "ioapic.h"
  26
  27 /* This should be called with the kvm->lock mutex held */
  28 void kvm_set_irq(struct kvm *kvm, int irq, int level)
  29 {
  30         /* Not possible to detect if the guest uses the PIC or the
  31          * IOAPIC.  So set the bit in both. The guest will ignore
  32          * writes to the unused one.
  33          */
  34         kvm_ioapic_set_irq(kvm->arch.vioapic, irq, level);
  35 #ifdef CONFIG_X86
  36         kvm_pic_set_irq(pic_irqchip(kvm), irq, level);
  37 #endif
  38 }
  39
  40 void kvm_notify_acked_irq(struct kvm *kvm, unsigned gsi)
  41 {
  42         struct kvm_irq_ack_notifier *kian;
  43         struct hlist_node *n;
  44
  45         hlist_for_each_entry(kian, n, &kvm->arch.irq_ack_notifier_list, link)
  46                 if (kian->gsi == gsi)
  47                         kian->irq_acked(kian);
  48 }
  49
  50 void kvm_register_irq_ack_notifier(struct kvm *kvm,
  51                                    struct kvm_irq_ack_notifier *kian)
  52 {
  53         hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
  54 }
  55
  56 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
  57                                      struct kvm_irq_ack_notifier *kian)
  58 {
  59         hlist_del(&kian->link);
  60 }