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/qdev-properties.h"
  25 #include "hw/i386/pc.h"
  26 #include "qapi/error.h"
  27 #include "qemu/error-report.h"
  28 #include "trace.h"
  29 #include "sysemu/kvm.h"
  30
  31 void x86_iommu_iec_register_notifier(X86IOMMUState *iommu,
  32                                      iec_notify_fn fn, void *data)
  33 {
  34     IEC_Notifier *notifier = g_new0(IEC_Notifier, 1);
  35
  36     notifier->iec_notify = fn;
  37     notifier->private = data;
  38
  39     QLIST_INSERT_HEAD(&iommu->iec_notifiers, notifier, list);
  40 }
  41
  42 void x86_iommu_iec_notify_all(X86IOMMUState *iommu, bool global,
  43                               uint32_t index, uint32_t mask)
  44 {
  45     IEC_Notifier *notifier;
  46
  47     trace_x86_iommu_iec_notify(global, index, mask);
  48
  49     QLIST_FOREACH(notifier, &iommu->iec_notifiers, list) {
  50         if (notifier->iec_notify) {
  51             notifier->iec_notify(notifier->private, global,
  52                                  index, mask);
  53         }
  54     }
  55 }
  56
  57 /* Generate one MSI message from VTDIrq info */
  58 void x86_iommu_irq_to_msi_message(X86IOMMUIrq *irq, MSIMessage *msg_out)
  59 {
  60     X86IOMMU_MSIMessage msg = {};
  61
  62     /* Generate address bits */
  63     msg.dest_mode = irq->dest_mode;
  64     msg.redir_hint = irq->redir_hint;
  65     msg.dest = irq->dest;
  66     msg.__addr_hi = irq->dest & 0xffffff00;
  67     msg.__addr_head = cpu_to_le32(0xfee);
  68     /* Keep this from original MSI address bits */
  69     msg.__not_used = irq->msi_addr_last_bits;
  70
  71     /* Generate data bits */
  72     msg.vector = irq->vector;
  73     msg.delivery_mode = irq->delivery_mode;
  74     msg.level = 1;
  75     msg.trigger_mode = irq->trigger_mode;
  76
  77     msg_out->address = msg.msi_addr;
  78     msg_out->data = msg.msi_data;
  79 }
  80
  81 /* Default X86 IOMMU device */
  82 static X86IOMMUState *x86_iommu_default = NULL;
  83
  84 static void x86_iommu_set_default(X86IOMMUState *x86_iommu)
  85 {
  86     assert(x86_iommu);
  87
  88     if (x86_iommu_default) {
  89         error_report("QEMU does not support multiple vIOMMUs "
  90                      "for x86 yet.");
  91         exit(1);
  92     }
  93
  94     x86_iommu_default = x86_iommu;
  95 }
  96
  97 X86IOMMUState *x86_iommu_get_default(void)
  98 {
  99     return x86_iommu_default;
 100 }
 101
 102 IommuType x86_iommu_get_type(void)
 103 {
 104     return x86_iommu_default->type;
 105 }
 106
 107 static void x86_iommu_realize(DeviceState *dev, Error **errp)
 108 {
 109     X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
 110     X86IOMMUClass *x86_class = X86_IOMMU_DEVICE_GET_CLASS(dev);
 111     MachineState *ms = MACHINE(qdev_get_machine());
 112     MachineClass *mc = MACHINE_GET_CLASS(ms);
 113     PCMachineState *pcms =
 114         PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
 115     QLIST_INIT(&x86_iommu->iec_notifiers);
 116     bool irq_all_kernel = kvm_irqchip_in_kernel() && !kvm_irqchip_is_split();
 117
 118     if (!pcms || !pcms->bus) {
 119         error_setg(errp, "Machine-type '%s' not supported by IOMMU",
 120                    mc->name);
 121         return;
 122     }
 123
 124     /* If the user didn't specify IR, choose a default value for it */
 125     if (x86_iommu->intr_supported == ON_OFF_AUTO_AUTO) {
 126         x86_iommu->intr_supported = irq_all_kernel ?
 127             ON_OFF_AUTO_OFF : ON_OFF_AUTO_ON;
 128     }
 129
 130     /* Both Intel and AMD IOMMU IR only support "kernel-irqchip={off|split}" */
 131     if (x86_iommu_ir_supported(x86_iommu) && irq_all_kernel) {
 132         error_setg(errp, "Interrupt Remapping cannot work with "
 133                          "kernel-irqchip=on, please use 'split|off'.");
 134         return;
 135     }
 136
 137     if (x86_class->realize) {
 138         x86_class->realize(dev, errp);
 139     }
 140
 141     x86_iommu_set_default(X86_IOMMU_DEVICE(dev));
 142 }
 143
 144 static Property x86_iommu_properties[] = {
 145     DEFINE_PROP_ON_OFF_AUTO("intremap", X86IOMMUState,
 146                             intr_supported, ON_OFF_AUTO_AUTO),
 147     DEFINE_PROP_BOOL("device-iotlb", X86IOMMUState, dt_supported, false),
 148     DEFINE_PROP_BOOL("pt", X86IOMMUState, pt_supported, true),
 149     DEFINE_PROP_END_OF_LIST(),
 150 };
 151
 152 static void x86_iommu_class_init(ObjectClass *klass, void *data)
 153 {
 154     DeviceClass *dc = DEVICE_CLASS(klass);
 155     dc->realize = x86_iommu_realize;
 156     device_class_set_props(dc, x86_iommu_properties);
 157 }
 158
 159 bool x86_iommu_ir_supported(X86IOMMUState *s)
 160 {
 161     return s->intr_supported == ON_OFF_AUTO_ON;
 162 }
 163
 164 static const TypeInfo x86_iommu_info = {
 165     .name          = TYPE_X86_IOMMU_DEVICE,
 166     .parent        = TYPE_SYS_BUS_DEVICE,
 167     .instance_size = sizeof(X86IOMMUState),
 168     .class_init    = x86_iommu_class_init,
 169     .class_size    = sizeof(X86IOMMUClass),
 170     .abstract      = true,
 171 };
 172
 173 static void x86_iommu_register_types(void)
 174 {
 175     type_register_static(&x86_iommu_info);
 176 }
 177
 178 type_init(x86_iommu_register_types)