LXR qemu/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#include "sysemu/kvm.h"
  29
  30void x86_iommu_iec_register_notifier(X86IOMMUState *iommu,
  31                                     iec_notify_fn fn, void *data)
  32{
  33    IEC_Notifier *notifier = g_new0(IEC_Notifier, 1);
  34
  35    notifier->iec_notify = fn;
  36    notifier->private = data;
  37
  38    QLIST_INSERT_HEAD(&iommu->iec_notifiers, notifier, list);
  39}
  40
  41void x86_iommu_iec_notify_all(X86IOMMUState *iommu, bool global,
  42                              uint32_t index, uint32_t mask)
  43{
  44    IEC_Notifier *notifier;
  45
  46    trace_x86_iommu_iec_notify(global, index, mask);
  47
  48    QLIST_FOREACH(notifier, &iommu->iec_notifiers, list) {
  49        if (notifier->iec_notify) {
  50            notifier->iec_notify(notifier->private, global,
  51                                 index, mask);
  52        }
  53    }
  54}
  55
  56/* Generate one MSI message from VTDIrq info */
  57void x86_iommu_irq_to_msi_message(X86IOMMUIrq *irq, MSIMessage *msg_out)
  58{
  59    X86IOMMU_MSIMessage msg = {};
  60
  61    /* Generate address bits */
  62    msg.dest_mode = irq->dest_mode;
  63    msg.redir_hint = irq->redir_hint;
  64    msg.dest = irq->dest;
  65    msg.__addr_hi = irq->dest & 0xffffff00;
  66    msg.__addr_head = cpu_to_le32(0xfee);
  67    /* Keep this from original MSI address bits */
  68    msg.__not_used = irq->msi_addr_last_bits;
  69
  70    /* Generate data bits */
  71    msg.vector = irq->vector;
  72    msg.delivery_mode = irq->delivery_mode;
  73    msg.level = 1;
  74    msg.trigger_mode = irq->trigger_mode;
  75
  76    msg_out->address = msg.msi_addr;
  77    msg_out->data = msg.msi_data;
  78}
  79
  80/* Default X86 IOMMU device */
  81static X86IOMMUState *x86_iommu_default = NULL;
  82
  83static void x86_iommu_set_default(X86IOMMUState *x86_iommu)
  84{
  85    assert(x86_iommu);
  86
  87    if (x86_iommu_default) {
  88        error_report("QEMU does not support multiple vIOMMUs "
  89                     "for x86 yet.");
  90        exit(1);
  91    }
  92
  93    x86_iommu_default = x86_iommu;
  94}
  95
  96X86IOMMUState *x86_iommu_get_default(void)
  97{
  98    return x86_iommu_default;
  99}
 100
 101IommuType x86_iommu_get_type(void)
 102{
 103    return x86_iommu_default->type;
 104}
 105
 106static void x86_iommu_realize(DeviceState *dev, Error **errp)
 107{
 108    X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev);
 109    X86IOMMUClass *x86_class = X86_IOMMU_GET_CLASS(dev);
 110    MachineState *ms = MACHINE(qdev_get_machine());
 111    MachineClass *mc = MACHINE_GET_CLASS(ms);
 112    PCMachineState *pcms =
 113        PC_MACHINE(object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE));
 114    QLIST_INIT(&x86_iommu->iec_notifiers);
 115    bool irq_all_kernel = kvm_irqchip_in_kernel() && !kvm_irqchip_is_split();
 116
 117    if (!pcms || !pcms->bus) {
 118        error_setg(errp, "Machine-type '%s' not supported by IOMMU",
 119                   mc->name);
 120        return;
 121    }
 122
 123    /* If the user didn't specify IR, choose a default value for it */
 124    if (x86_iommu->intr_supported == ON_OFF_AUTO_AUTO) {
 125        x86_iommu->intr_supported = irq_all_kernel ?
 126            ON_OFF_AUTO_OFF : ON_OFF_AUTO_ON;
 127    }
 128
 129    /* Both Intel and AMD IOMMU IR only support "kernel-irqchip={off|split}" */
 130    if (x86_iommu_ir_supported(x86_iommu) && irq_all_kernel) {
 131        error_setg(errp, "Interrupt Remapping cannot work with "
 132                         "kernel-irqchip=on, please use 'split|off'.");
 133        return;
 134    }
 135
 136    if (x86_class->realize) {
 137        x86_class->realize(dev, errp);
 138    }
 139
 140    x86_iommu_set_default(X86_IOMMU_DEVICE(dev));
 141}
 142
 143static Property x86_iommu_properties[] = {
 144    DEFINE_PROP_ON_OFF_AUTO("intremap", X86IOMMUState,
 145                            intr_supported, ON_OFF_AUTO_AUTO),
 146    DEFINE_PROP_BOOL("device-iotlb", X86IOMMUState, dt_supported, false),
 147    DEFINE_PROP_BOOL("pt", X86IOMMUState, pt_supported, true),
 148    DEFINE_PROP_END_OF_LIST(),
 149};
 150
 151static void x86_iommu_class_init(ObjectClass *klass, void *data)
 152{
 153    DeviceClass *dc = DEVICE_CLASS(klass);
 154    dc->realize = x86_iommu_realize;
 155    dc->props = x86_iommu_properties;
 156}
 157
 158bool x86_iommu_ir_supported(X86IOMMUState *s)
 159{
 160    return s->intr_supported == ON_OFF_AUTO_ON;
 161}
 162
 163static const TypeInfo x86_iommu_info = {
 164    .name          = TYPE_X86_IOMMU_DEVICE,
 165    .parent        = TYPE_SYS_BUS_DEVICE,
 166    .instance_size = sizeof(X86IOMMUState),
 167    .class_init    = x86_iommu_class_init,
 168    .class_size    = sizeof(X86IOMMUClass),
 169    .abstract      = true,
 170};
 171
 172static void x86_iommu_register_types(void)
 173{
 174    type_register_static(&x86_iommu_info);
 175}
 176
 177type_init(x86_iommu_register_types)
 178