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 "hw/i386/pc.h"
  25 #include "qapi/error.h"
  26 #include "qemu/error-report.h"
  27 #include "trace.h"
  28
  29 void x86_iommu_iec_register_notifier(X86IOMMUState *iommu,
  30                                      iec_notify_fn fn, void *data)
  31 {
  32     IEC_Notifier *notifier = g_new0(IEC_Notifier, 1);
  33
  34     notifier->iec_notify = fn;
  35     notifier->private = data;
  36
  37     QLIST_INSERT_HEAD(&iommu->iec_notifiers, notifier, list);
  38 }
  39
  40 void x86_iommu_iec_notify_all(X86IOMMUState *iommu, bool global,
  41                               uint32_t index, uint32_t mask)
  42 {
  43     IEC_Notifier *notifier;
  44
  45     trace_x86_iommu_iec_notify(global, index, mask);
  46
  47     QLIST_FOREACH(notifier, &iommu->iec_notifiers, list) {
  48         if (notifier->iec_notify) {
  49             notifier->iec_notify(notifier->private, global,
  50                                  index, mask);
  51         }
  52     }
  53 }
  54
  55 /* Default X86 IOMMU device */
  56 static X86IOMMUState *x86_iommu_default = NULL;
  57
  58 static void x86_iommu_set_default(X86IOMMUState *x86_iommu)
  59 {
  60     assert(x86_iommu);
  61
  62     if (x86_iommu_default) {
  63         error_report("QEMU does not support multiple vIOMMUs "
  64                      "for x86 yet.");
  65         exit(1);
  66     }
  67
  68     x86_iommu_default = x86_iommu;
  69 }
  70
  71 X86IOMMUState *x86_iommu_get_default(void)
  72 {
  73     return x86_iommu_default;
  74 }
  75
  76 IommuType x86_iommu_get_type(void)
  77 {
  78     return x86_iommu_default->type;
  79 }
  80
  81 static void x86_iommu_realize(DeviceState *dev, Error **errp)
  82 {
  83     X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
  84     X86IOMMUClass *x86_class = X86_IOMMU_GET_CLASS(dev);
  85     MachineState *ms = MACHINE(qdev_get_machine());
  86     MachineClass *mc = MACHINE_GET_CLASS(ms);
  87     PCMachineState *pcms =
  88         PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
  89     QLIST_INIT(&x86_iommu->iec_notifiers);
  90
  91     if (!pcms || !pcms->bus) {
  92         error_setg(errp, "Machine-type '%s' not supported by IOMMU",
  93                    mc->name);
  94         return;
  95     }
  96
  97     if (x86_class->realize) {
  98         x86_class->realize(dev, errp);
  99     }
 100
 101     x86_iommu_set_default(X86_IOMMU_DEVICE(dev));
 102 }
 103
 104 static Property x86_iommu_properties[] = {
 105     DEFINE_PROP_BOOL("intremap", X86IOMMUState, intr_supported, false),
 106     DEFINE_PROP_BOOL("device-iotlb", X86IOMMUState, dt_supported, false),
 107     DEFINE_PROP_BOOL("pt", X86IOMMUState, pt_supported, true),
 108     DEFINE_PROP_END_OF_LIST(),
 109 };
 110
 111 static void x86_iommu_class_init(ObjectClass *klass, void *data)
 112 {
 113     DeviceClass *dc = DEVICE_CLASS(klass);
 114     dc->realize = x86_iommu_realize;
 115     dc->props = x86_iommu_properties;
 116 }
 117
 118 static const TypeInfo x86_iommu_info = {
 119     .name          = TYPE_X86_IOMMU_DEVICE,
 120     .parent        = TYPE_SYS_BUS_DEVICE,
 121     .instance_size = sizeof(X86IOMMUState),
 122     .class_init    = x86_iommu_class_init,
 123     .class_size    = sizeof(X86IOMMUClass),
 124     .abstract      = true,
 125 };
 126
 127 static void x86_iommu_register_types(void)
 128 {
 129     type_register_static(&x86_iommu_info);
 130 }
 131
 132 type_init(x86_iommu_register_types)