hw/i386/x86-iommu.c

   1 /*
   2  * QEMU emulation of common X86 IOMMU
   3  *
   4  * Copyright (C) 2016 Peter Xu, Red Hat <peterx@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "hw/sysbus.h"
  22 #include "hw/boards.h"
  23 #include "hw/i386/x86-iommu.h"
  24 #include "qemu/error-report.h"
  25
  26 /* Default X86 IOMMU device */
  27 static X86IOMMUState *x86_iommu_default = NULL;
  28
  29 static void x86_iommu_set_default(X86IOMMUState *x86_iommu)
  30 {
  31     assert(x86_iommu);
  32
  33     if (x86_iommu_default) {
  34         error_report("QEMU does not support multiple vIOMMUs "
  35                      "for x86 yet.");
  36         exit(1);
  37     }
  38
  39     x86_iommu_default = x86_iommu;
  40 }
  41
  42 X86IOMMUState *x86_iommu_get_default(void)
  43 {
  44     return x86_iommu_default;
  45 }
  46
  47 static void x86_iommu_realize(DeviceState *dev, Error **errp)
  48 {
  49     X86IOMMUClass *x86_class = X86_IOMMU_GET_CLASS(dev);
  50     if (x86_class->realize) {
  51         x86_class->realize(dev, errp);
  52     }
  53     x86_iommu_set_default(X86_IOMMU_DEVICE(dev));
  54 }
  55
  56 static void x86_iommu_class_init(ObjectClass *klass, void *data)
  57 {
  58     DeviceClass *dc = DEVICE_CLASS(klass);
  59     dc->realize = x86_iommu_realize;
  60 }
  61
  62 static const TypeInfo x86_iommu_info = {
  63     .name          = TYPE_X86_IOMMU_DEVICE,
  64     .parent        = TYPE_SYS_BUS_DEVICE,
  65     .instance_size = sizeof(X86IOMMUState),
  66     .class_init    = x86_iommu_class_init,
  67     .class_size    = sizeof(X86IOMMUClass),
  68     .abstract      = true,
  69 };
  70
  71 static void x86_iommu_register_types(void)
  72 {
  73     type_register_static(&x86_iommu_info);
  74 }
  75
  76 type_init(x86_iommu_register_types)