hw/intc/arm_gicv3_kvm.c

   1 /*
   2  * ARM Generic Interrupt Controller using KVM in-kernel support
   3  *
   4  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
   5  * Written by Pavel Fedin
   6  * Based on vGICv2 code by Peter Maydell
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation, either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "qemu/osdep.h"
  23 #include "qapi/error.h"
  24 #include "hw/intc/arm_gicv3_common.h"
  25 #include "hw/sysbus.h"
  26 #include "sysemu/kvm.h"
  27 #include "kvm_arm.h"
  28 #include "vgic_common.h"
  29 #include "migration/migration.h"
  30
  31 #ifdef DEBUG_GICV3_KVM
  32 #define DPRINTF(fmt, ...) \
  33     do { fprintf(stderr, "kvm_gicv3: " fmt, ## __VA_ARGS__); } while (0)
  34 #else
  35 #define DPRINTF(fmt, ...) \
  36     do { } while (0)
  37 #endif
  38
  39 #define TYPE_KVM_ARM_GICV3 "kvm-arm-gicv3"
  40 #define KVM_ARM_GICV3(obj) \
  41      OBJECT_CHECK(GICv3State, (obj), TYPE_KVM_ARM_GICV3)
  42 #define KVM_ARM_GICV3_CLASS(klass) \
  43      OBJECT_CLASS_CHECK(KVMARMGICv3Class, (klass), TYPE_KVM_ARM_GICV3)
  44 #define KVM_ARM_GICV3_GET_CLASS(obj) \
  45      OBJECT_GET_CLASS(KVMARMGICv3Class, (obj), TYPE_KVM_ARM_GICV3)
  46
  47 typedef struct KVMARMGICv3Class {
  48     ARMGICv3CommonClass parent_class;
  49     DeviceRealize parent_realize;
  50     void (*parent_reset)(DeviceState *dev);
  51 } KVMARMGICv3Class;
  52
  53 static void kvm_arm_gicv3_set_irq(void *opaque, int irq, int level)
  54 {
  55     GICv3State *s = (GICv3State *)opaque;
  56
  57     kvm_arm_gic_set_irq(s->num_irq, irq, level);
  58 }
  59
  60 static void kvm_arm_gicv3_put(GICv3State *s)
  61 {
  62     /* TODO */
  63     DPRINTF("Cannot put kernel gic state, no kernel interface\n");
  64 }
  65
  66 static void kvm_arm_gicv3_get(GICv3State *s)
  67 {
  68     /* TODO */
  69     DPRINTF("Cannot get kernel gic state, no kernel interface\n");
  70 }
  71
  72 static void kvm_arm_gicv3_reset(DeviceState *dev)
  73 {
  74     GICv3State *s = ARM_GICV3_COMMON(dev);
  75     KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s);
  76
  77     DPRINTF("Reset\n");
  78
  79     kgc->parent_reset(dev);
  80     kvm_arm_gicv3_put(s);
  81 }
  82
  83 static void kvm_arm_gicv3_realize(DeviceState *dev, Error **errp)
  84 {
  85     GICv3State *s = KVM_ARM_GICV3(dev);
  86     KVMARMGICv3Class *kgc = KVM_ARM_GICV3_GET_CLASS(s);
  87     Error *local_err = NULL;
  88     int i;
  89
  90     DPRINTF("kvm_arm_gicv3_realize\n");
  91
  92     kgc->parent_realize(dev, &local_err);
  93     if (local_err) {
  94         error_propagate(errp, local_err);
  95         return;
  96     }
  97
  98     if (s->security_extn) {
  99         error_setg(errp, "the in-kernel VGICv3 does not implement the "
 100                    "security extensions");
 101         return;
 102     }
 103
 104     gicv3_init_irqs_and_mmio(s, kvm_arm_gicv3_set_irq, NULL);
 105
 106     /* Block migration of a KVM GICv3 device: the API for saving and restoring
 107      * the state in the kernel is not yet finalised in the kernel or
 108      * implemented in QEMU.
 109      */
 110     error_setg(&s->migration_blocker, "vGICv3 migration is not implemented");
 111     migrate_add_blocker(s->migration_blocker, &local_err);
 112     if (local_err) {
 113         error_propagate(errp, local_err);
 114         error_free(s->migration_blocker);
 115         return;
 116     }
 117
 118     /* Try to create the device via the device control API */
 119     s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V3, false);
 120     if (s->dev_fd < 0) {
 121         error_setg_errno(errp, -s->dev_fd, "error creating in-kernel VGIC");
 122         return;
 123     }
 124
 125     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
 126                       0, &s->num_irq, true);
 127
 128     /* Tell the kernel to complete VGIC initialization now */
 129     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 130                       KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
 131
 132     kvm_arm_register_device(&s->iomem_dist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
 133                             KVM_VGIC_V3_ADDR_TYPE_DIST, s->dev_fd);
 134     kvm_arm_register_device(&s->iomem_redist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
 135                             KVM_VGIC_V3_ADDR_TYPE_REDIST, s->dev_fd);
 136
 137     if (kvm_has_gsi_routing()) {
 138         /* set up irq routing */
 139         kvm_init_irq_routing(kvm_state);
 140         for (i = 0; i < s->num_irq - GIC_INTERNAL; ++i) {
 141             kvm_irqchip_add_irq_route(kvm_state, i, 0, i);
 142         }
 143
 144         kvm_gsi_routing_allowed = true;
 145
 146         kvm_irqchip_commit_routes(kvm_state);
 147     }
 148 }
 149
 150 static void kvm_arm_gicv3_class_init(ObjectClass *klass, void *data)
 151 {
 152     DeviceClass *dc = DEVICE_CLASS(klass);
 153     ARMGICv3CommonClass *agcc = ARM_GICV3_COMMON_CLASS(klass);
 154     KVMARMGICv3Class *kgc = KVM_ARM_GICV3_CLASS(klass);
 155
 156     agcc->pre_save = kvm_arm_gicv3_get;
 157     agcc->post_load = kvm_arm_gicv3_put;
 158     kgc->parent_realize = dc->realize;
 159     kgc->parent_reset = dc->reset;
 160     dc->realize = kvm_arm_gicv3_realize;
 161     dc->reset = kvm_arm_gicv3_reset;
 162 }
 163
 164 static const TypeInfo kvm_arm_gicv3_info = {
 165     .name = TYPE_KVM_ARM_GICV3,
 166     .parent = TYPE_ARM_GICV3_COMMON,
 167     .instance_size = sizeof(GICv3State),
 168     .class_init = kvm_arm_gicv3_class_init,
 169     .class_size = sizeof(KVMARMGICv3Class),
 170 };
 171
 172 static void kvm_arm_gicv3_register_types(void)
 173 {
 174     type_register_static(&kvm_arm_gicv3_info);
 175 }
 176
 177 type_init(kvm_arm_gicv3_register_types)