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     Error *local_err = NULL;
  60
  61     /*
  62      * Block migration of a KVM GICv3 ITS device: the API for saving and
  63      * restoring the state in the kernel is not yet available
  64      */
  65     error_setg(&s->migration_blocker, "vITS migration is not implemented");
  66     migrate_add_blocker(s->migration_blocker, &local_err);
  67     if (local_err) {
  68         error_propagate(errp, local_err);
  69         error_free(s->migration_blocker);
  70         return;
  71     }
  72
  73     s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, false);
  74     if (s->dev_fd < 0) {
  75         error_setg_errno(errp, -s->dev_fd, "error creating in-kernel ITS");
  76         return;
  77     }
  78
  79     /* explicit init of the ITS */
  80     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
  81                       KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
  82
  83     /* register the base address */
  84     kvm_arm_register_device(&s->iomem_its_cntrl, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
  85                             KVM_VGIC_ITS_ADDR_TYPE, s->dev_fd);
  86
  87     gicv3_its_init_mmio(s, NULL);
  88
  89     kvm_msi_use_devid = true;
  90     kvm_gsi_direct_mapping = false;
  91     kvm_msi_via_irqfd_allowed = kvm_irqfds_enabled();
  92 }
  93
  94 static void kvm_arm_its_init(Object *obj)
  95 {
  96     GICv3ITSState *s = KVM_ARM_ITS(obj);
  97
  98     object_property_add_link(obj, "parent-gicv3",
  99                              "kvm-arm-gicv3", (Object **)&s->gicv3,
 100                              object_property_allow_set_link,
 101                              OBJ_PROP_LINK_UNREF_ON_RELEASE,
 102                              &error_abort);
 103 }
 104
 105 static void kvm_arm_its_class_init(ObjectClass *klass, void *data)
 106 {
 107     DeviceClass *dc = DEVICE_CLASS(klass);
 108     GICv3ITSCommonClass *icc = ARM_GICV3_ITS_COMMON_CLASS(klass);
 109
 110     dc->realize = kvm_arm_its_realize;
 111     icc->send_msi = kvm_its_send_msi;
 112 }
 113
 114 static const TypeInfo kvm_arm_its_info = {
 115     .name = TYPE_KVM_ARM_ITS,
 116     .parent = TYPE_ARM_GICV3_ITS_COMMON,
 117     .instance_size = sizeof(GICv3ITSState),
 118     .instance_init = kvm_arm_its_init,
 119     .class_init = kvm_arm_its_class_init,
 120 };
 121
 122 static void kvm_arm_its_register_types(void)
 123 {
 124     type_register_static(&kvm_arm_its_info);
 125 }
 126
 127 type_init(kvm_arm_its_register_types)