hw/intc/arm_gicv3_its_kvm.c

   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
  32 static 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
  56 static 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
  88 static 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
  99 static 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
 108 static 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
 116 static void kvm_arm_its_register_types(void)
 117 {
 118     type_register_static(&kvm_arm_its_info);
 119 }
 120
 121 type_init(kvm_arm_its_register_types)