xref: /openbmc/qemu/hw/intc/arm_gicv3_kvm.c (revision fe44dc91)
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)
178