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
  89     DPRINTF("kvm_arm_gicv3_realize\n");
  90
  91     kgc->parent_realize(dev, &local_err);
  92     if (local_err) {
  93         error_propagate(errp, local_err);
  94         return;
  95     }
  96
  97     if (s->security_extn) {
  98         error_setg(errp, "the in-kernel VGICv3 does not implement the "
  99                    "security extensions");
 100         return;
 101     }
 102
 103     gicv3_init_irqs_and_mmio(s, kvm_arm_gicv3_set_irq, NULL);
 104
 105     /* Try to create the device via the device control API */
 106     s->dev_fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V3, false);
 107     if (s->dev_fd < 0) {
 108         error_setg_errno(errp, -s->dev_fd, "error creating in-kernel VGIC");
 109         return;
 110     }
 111
 112     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS,
 113                       0, &s->num_irq, true);
 114
 115     /* Tell the kernel to complete VGIC initialization now */
 116     kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
 117                       KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
 118
 119     kvm_arm_register_device(&s->iomem_dist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
 120                             KVM_VGIC_V3_ADDR_TYPE_DIST, s->dev_fd);
 121     kvm_arm_register_device(&s->iomem_redist, -1, KVM_DEV_ARM_VGIC_GRP_ADDR,
 122                             KVM_VGIC_V3_ADDR_TYPE_REDIST, s->dev_fd);
 123
 124     /* Block migration of a KVM GICv3 device: the API for saving and restoring
 125      * the state in the kernel is not yet finalised in the kernel or
 126      * implemented in QEMU.
 127      */
 128     error_setg(&s->migration_blocker, "vGICv3 migration is not implemented");
 129     migrate_add_blocker(s->migration_blocker);
 130 }
 131
 132 static void kvm_arm_gicv3_class_init(ObjectClass *klass, void *data)
 133 {
 134     DeviceClass *dc = DEVICE_CLASS(klass);
 135     ARMGICv3CommonClass *agcc = ARM_GICV3_COMMON_CLASS(klass);
 136     KVMARMGICv3Class *kgc = KVM_ARM_GICV3_CLASS(klass);
 137
 138     agcc->pre_save = kvm_arm_gicv3_get;
 139     agcc->post_load = kvm_arm_gicv3_put;
 140     kgc->parent_realize = dc->realize;
 141     kgc->parent_reset = dc->reset;
 142     dc->realize = kvm_arm_gicv3_realize;
 143     dc->reset = kvm_arm_gicv3_reset;
 144 }
 145
 146 static const TypeInfo kvm_arm_gicv3_info = {
 147     .name = TYPE_KVM_ARM_GICV3,
 148     .parent = TYPE_ARM_GICV3_COMMON,
 149     .instance_size = sizeof(GICv3State),
 150     .class_init = kvm_arm_gicv3_class_init,
 151     .class_size = sizeof(KVMARMGICv3Class),
 152 };
 153
 154 static void kvm_arm_gicv3_register_types(void)
 155 {
 156     type_register_static(&kvm_arm_gicv3_info);
 157 }
 158
 159 type_init(kvm_arm_gicv3_register_types)