Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 1 | /* |
| 2 | * VGIC: KVM DEVICE API |
| 3 | * |
| 4 | * Copyright (C) 2015 ARM Ltd. |
| 5 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | #include <linux/kvm_host.h> |
| 17 | #include <kvm/arm_vgic.h> |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 18 | #include <linux/uaccess.h> |
| 19 | #include "vgic.h" |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 20 | |
| 21 | /* common helpers */ |
| 22 | |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 23 | static int vgic_set_common_attr(struct kvm_device *dev, |
| 24 | struct kvm_device_attr *attr) |
| 25 | { |
| 26 | switch (attr->group) { |
| 27 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: { |
| 28 | u32 __user *uaddr = (u32 __user *)(long)attr->addr; |
| 29 | u32 val; |
| 30 | int ret = 0; |
| 31 | |
| 32 | if (get_user(val, uaddr)) |
| 33 | return -EFAULT; |
| 34 | |
| 35 | /* |
| 36 | * We require: |
| 37 | * - at least 32 SPIs on top of the 16 SGIs and 16 PPIs |
| 38 | * - at most 1024 interrupts |
| 39 | * - a multiple of 32 interrupts |
| 40 | */ |
| 41 | if (val < (VGIC_NR_PRIVATE_IRQS + 32) || |
| 42 | val > VGIC_MAX_RESERVED || |
| 43 | (val & 31)) |
| 44 | return -EINVAL; |
| 45 | |
| 46 | mutex_lock(&dev->kvm->lock); |
| 47 | |
| 48 | if (vgic_ready(dev->kvm) || dev->kvm->arch.vgic.nr_spis) |
| 49 | ret = -EBUSY; |
| 50 | else |
| 51 | dev->kvm->arch.vgic.nr_spis = |
| 52 | val - VGIC_NR_PRIVATE_IRQS; |
| 53 | |
| 54 | mutex_unlock(&dev->kvm->lock); |
| 55 | |
| 56 | return ret; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | return -ENXIO; |
| 61 | } |
| 62 | |
| 63 | static int vgic_get_common_attr(struct kvm_device *dev, |
| 64 | struct kvm_device_attr *attr) |
| 65 | { |
| 66 | int r = -ENXIO; |
| 67 | |
| 68 | switch (attr->group) { |
| 69 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: { |
| 70 | u32 __user *uaddr = (u32 __user *)(long)attr->addr; |
| 71 | |
| 72 | r = put_user(dev->kvm->arch.vgic.nr_spis + |
| 73 | VGIC_NR_PRIVATE_IRQS, uaddr); |
| 74 | break; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | return r; |
| 79 | } |
| 80 | |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 81 | static int vgic_create(struct kvm_device *dev, u32 type) |
| 82 | { |
| 83 | return kvm_vgic_create(dev->kvm, type); |
| 84 | } |
| 85 | |
| 86 | static void vgic_destroy(struct kvm_device *dev) |
| 87 | { |
| 88 | kfree(dev); |
| 89 | } |
| 90 | |
| 91 | void kvm_register_vgic_device(unsigned long type) |
| 92 | { |
| 93 | switch (type) { |
| 94 | case KVM_DEV_TYPE_ARM_VGIC_V2: |
| 95 | kvm_register_device_ops(&kvm_arm_vgic_v2_ops, |
| 96 | KVM_DEV_TYPE_ARM_VGIC_V2); |
| 97 | break; |
| 98 | #ifdef CONFIG_KVM_ARM_VGIC_V3 |
| 99 | case KVM_DEV_TYPE_ARM_VGIC_V3: |
| 100 | kvm_register_device_ops(&kvm_arm_vgic_v3_ops, |
| 101 | KVM_DEV_TYPE_ARM_VGIC_V3); |
| 102 | break; |
| 103 | #endif |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | /* V2 ops */ |
| 108 | |
| 109 | static int vgic_v2_set_attr(struct kvm_device *dev, |
| 110 | struct kvm_device_attr *attr) |
| 111 | { |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 112 | int ret; |
| 113 | |
| 114 | ret = vgic_set_common_attr(dev, attr); |
| 115 | return ret; |
| 116 | |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | static int vgic_v2_get_attr(struct kvm_device *dev, |
| 120 | struct kvm_device_attr *attr) |
| 121 | { |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 122 | int ret; |
| 123 | |
| 124 | ret = vgic_get_common_attr(dev, attr); |
| 125 | return ret; |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static int vgic_v2_has_attr(struct kvm_device *dev, |
| 129 | struct kvm_device_attr *attr) |
| 130 | { |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 131 | switch (attr->group) { |
| 132 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: |
| 133 | return 0; |
| 134 | } |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 135 | return -ENXIO; |
| 136 | } |
| 137 | |
| 138 | struct kvm_device_ops kvm_arm_vgic_v2_ops = { |
| 139 | .name = "kvm-arm-vgic-v2", |
| 140 | .create = vgic_create, |
| 141 | .destroy = vgic_destroy, |
| 142 | .set_attr = vgic_v2_set_attr, |
| 143 | .get_attr = vgic_v2_get_attr, |
| 144 | .has_attr = vgic_v2_has_attr, |
| 145 | }; |
| 146 | |
| 147 | /* V3 ops */ |
| 148 | |
| 149 | #ifdef CONFIG_KVM_ARM_VGIC_V3 |
| 150 | |
| 151 | static int vgic_v3_set_attr(struct kvm_device *dev, |
| 152 | struct kvm_device_attr *attr) |
| 153 | { |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 154 | return vgic_set_common_attr(dev, attr); |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | static int vgic_v3_get_attr(struct kvm_device *dev, |
| 158 | struct kvm_device_attr *attr) |
| 159 | { |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 160 | return vgic_get_common_attr(dev, attr); |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | static int vgic_v3_has_attr(struct kvm_device *dev, |
| 164 | struct kvm_device_attr *attr) |
| 165 | { |
Eric Auger | fca2560 | 2015-12-21 16:33:22 +0100 | [diff] [blame^] | 166 | switch (attr->group) { |
| 167 | case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: |
| 168 | return 0; |
| 169 | } |
Eric Auger | c86c772 | 2015-11-30 14:01:58 +0100 | [diff] [blame] | 170 | return -ENXIO; |
| 171 | } |
| 172 | |
| 173 | struct kvm_device_ops kvm_arm_vgic_v3_ops = { |
| 174 | .name = "kvm-arm-vgic-v3", |
| 175 | .create = vgic_create, |
| 176 | .destroy = vgic_destroy, |
| 177 | .set_attr = vgic_v3_set_attr, |
| 178 | .get_attr = vgic_v3_get_attr, |
| 179 | .has_attr = vgic_v3_has_attr, |
| 180 | }; |
| 181 | |
| 182 | #endif /* CONFIG_KVM_ARM_VGIC_V3 */ |
| 183 | |