arch/x86/kernel/kvm.c

   1 /*
   2  * KVM paravirt_ops implementation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  * Copyright (C) 2007, Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  19  * Copyright IBM Corporation, 2007
  20  *   Authors: Anthony Liguori <aliguori@us.ibm.com>
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/kvm_para.h>
  26 #include <linux/cpu.h>
  27 #include <linux/mm.h>
  28
  29 /*
  30  * No need for any "IO delay" on KVM
  31  */
  32 static void kvm_io_delay(void)
  33 {
  34 }
  35
  36 static void paravirt_ops_setup(void)
  37 {
  38         pv_info.name = "KVM";
  39         pv_info.paravirt_enabled = 1;
  40
  41         if (kvm_para_has_feature(KVM_FEATURE_NOP_IO_DELAY))
  42                 pv_cpu_ops.io_delay = kvm_io_delay;
  43
  44 }
  45
  46 void __init kvm_guest_init(void)
  47 {
  48         if (!kvm_para_available())
  49                 return;
  50
  51         paravirt_ops_setup();
  52 }