LXR qemu/hw/intc/arm_gicv3_its

   1/*
   2 * KVM-based ITS implementation for a GICv3-based system
   3 *
   4 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
   5 * Written by Pavel Fedin <p.fedin@samsung.com>
   6 *
   7 * This library is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU Lesser General Public
   9 * License as published by the Free Software Foundation; either
  10 * version 2 of the License, or (at your option) any later version.
  11 *
  12 * This library is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 * Lesser General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU Lesser General Public
  18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21#include "qemu/osdep.h"
  22#include "qapi/error.h"
  23#include "hw/intc/arm_gicv3_its_common.h"
  24#include "sysemu/sysemu.h"
  25#include "sysemu/kvm.h"
  26#include "kvm_arm.h"
  27#include "migration/migration.h"
  28
  29#define TYPE_KVM_ARM_ITS "arm-its-kvm"
  30#define KVM_ARM_ITS(obj) OBJECT_CHECK(GICv3ITSState, (obj), TYPE_KVM_ARM_ITS)
  31
  32static int kvm_its_send_msi(GICv3ITSState *s, uint32_t value, uint16_t devid)
  33{
  34    struct kvm_msi msi;
  35
  36    if (unlikely(!s->translater_gpa_known)) {
  37        MemoryRegion *mr = &s->iomem_its_translation;
  38        MemoryRegionSection mrs;
  39
  40        mrs = memory_region_find(mr, 0, 1);
  41        memory_region_unref(mrs.mr);
  42        s->gits_translater_gpa = mrs.offset_within_address_space + 0x40;
  43        s->translater_gpa_known = true;
  44    }
  45
  46    msi.address_lo = extract64(s->gits_translater_gpa, 0, 32);
  47    msi.address_hi = extract64(s->gits_translater_gpa, 32, 32);
  48    msi.data = le32_to_cpu(value);
  49    msi.flags = KVM_MSI_VALID_DEVID;
  50    msi.devid = devid;
  51    memset(msi.pad, 0, sizeof(msi.pad));
  52
  53    return kvm_vm_ioctl(kvm_state, KVM_SIGNAL_MSI, &msi);
  54}
  55
  56static void kvm_arm_its_realize(DeviceState *dev, Error **errp)
  57{
  58    GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
  59
  60    s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false);
  61    if (s->dev_fd < 0) {
  62        error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS");
  63        return;
  64    }
  65
  66    /* explicit init of the ITS */
  67    kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
  68                      KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
  69
  70    /* register the base address */
  71    kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
  72                            KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd);
  73
  74    gicv3_its_init_mmio(s, NULL);
  75
  76    /*
  77     * Block migration of a KVM GICv3 ITS device: the API for saving and
  78     * restoring the state in the kernel is not yet available
  79     */
  80    error_setg(&s->migration_blocker, "vITS migration is not implemented");
  81    migrate_add_blocker(s->migration_blocker);
  82
  83    kvm_msi_use_devid = true;
  84    kvm_gsi_direct_mapping = false;
  85    kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
  86}
  87
  88static void kvm_arm_its_init(Object *obj)
  89{
  90    GICv3ITSState *s = KVM_ARM_ITS(obj);
  91
  92    object_property_add_link(obj, "parent-gicv3",
  93                             "kvm-arm-gicv3", (Object **)&s->gicv3,
  94                             object_property_allow_set_link,
  95                             OBJ_PROP_LINK_UNREF_ON_RELEASE,
  96                             &error_abort);
  97}
  98
  99static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
 100{
 101    DeviceClass *dc = DEVICE_CLASS(klass);
 102    GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
 103
 104    dc->realize = kvm_arm_its_realize;
 105    icc->send_msi = kvm_its_send_msi;
 106}
 107
 108static const TypeInfo kvm_arm_its_info = {
 109    .name = TYPE_KVM_ARM_ITS,
 110    .parent = TYPE_ARM_GICV3_ITS_COMMON,
 111    .instance_size = sizeof(GICv3ITSState),
 112    .instance_init = kvm_arm_its_init,
 113    .class_init = kvm_arm_its_class_init,
 114};
 115
 116static void kvm_arm_its_register_types(void)
 117{
 118    type_register_static(&kvm_arm_its_info);
 119}
 120
 121type_init(kvm_arm_its_register_types)
 122