Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| 3 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/kvm_host.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/vmalloc.h> |
| 24 | #include <linux/fs.h> |
Marc Zyngier | 728d577 | 2012-10-15 12:09:45 +0100 | [diff] [blame] | 25 | #include <asm/cputype.h> |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/kvm.h> |
| 28 | #include <asm/kvm_asm.h> |
| 29 | #include <asm/kvm_emulate.h> |
Christoffer Dall | 1138245 | 2013-01-20 18:28:10 -0500 | [diff] [blame] | 30 | #include <asm/kvm_coproc.h> |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 31 | |
| 32 | #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM } |
| 33 | #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU } |
| 34 | |
| 35 | struct kvm_stats_debugfs_item debugfs_entries[] = { |
| 36 | { NULL } |
| 37 | }; |
| 38 | |
| 39 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) |
| 40 | { |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | static u64 core_reg_offset_from_id(u64 id) |
| 45 | { |
| 46 | return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE); |
| 47 | } |
| 48 | |
| 49 | static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 50 | { |
| 51 | u32 __user *uaddr = (u32 __user *)(long)reg->addr; |
| 52 | struct kvm_regs *regs = &vcpu->arch.regs; |
| 53 | u64 off; |
| 54 | |
| 55 | if (KVM_REG_SIZE(reg->id) != 4) |
| 56 | return -ENOENT; |
| 57 | |
| 58 | /* Our ID is an index into the kvm_regs struct. */ |
| 59 | off = core_reg_offset_from_id(reg->id); |
| 60 | if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id)) |
| 61 | return -ENOENT; |
| 62 | |
| 63 | return put_user(((u32 *)regs)[off], uaddr); |
| 64 | } |
| 65 | |
| 66 | static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 67 | { |
| 68 | u32 __user *uaddr = (u32 __user *)(long)reg->addr; |
| 69 | struct kvm_regs *regs = &vcpu->arch.regs; |
| 70 | u64 off, val; |
| 71 | |
| 72 | if (KVM_REG_SIZE(reg->id) != 4) |
| 73 | return -ENOENT; |
| 74 | |
| 75 | /* Our ID is an index into the kvm_regs struct. */ |
| 76 | off = core_reg_offset_from_id(reg->id); |
| 77 | if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id)) |
| 78 | return -ENOENT; |
| 79 | |
| 80 | if (get_user(val, uaddr) != 0) |
| 81 | return -EFAULT; |
| 82 | |
| 83 | if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) { |
| 84 | unsigned long mode = val & MODE_MASK; |
| 85 | switch (mode) { |
| 86 | case USR_MODE: |
| 87 | case FIQ_MODE: |
| 88 | case IRQ_MODE: |
| 89 | case SVC_MODE: |
| 90 | case ABT_MODE: |
| 91 | case UND_MODE: |
| 92 | break; |
| 93 | default: |
| 94 | return -EINVAL; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | ((u32 *)regs)[off] = val; |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| 103 | { |
| 104 | return -EINVAL; |
| 105 | } |
| 106 | |
| 107 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| 108 | { |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | |
| 112 | static unsigned long num_core_regs(void) |
| 113 | { |
| 114 | return sizeof(struct kvm_regs) / sizeof(u32); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG |
| 119 | * |
| 120 | * This is for all registers. |
| 121 | */ |
| 122 | unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) |
| 123 | { |
Christoffer Dall | 1138245 | 2013-01-20 18:28:10 -0500 | [diff] [blame] | 124 | return num_core_regs() + kvm_arm_num_coproc_regs(vcpu); |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | /** |
| 128 | * kvm_arm_copy_reg_indices - get indices of all registers. |
| 129 | * |
| 130 | * We do core registers right here, then we apppend coproc regs. |
| 131 | */ |
| 132 | int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) |
| 133 | { |
| 134 | unsigned int i; |
| 135 | const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE; |
| 136 | |
| 137 | for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) { |
| 138 | if (put_user(core_reg | i, uindices)) |
| 139 | return -EFAULT; |
| 140 | uindices++; |
| 141 | } |
| 142 | |
Christoffer Dall | 1138245 | 2013-01-20 18:28:10 -0500 | [diff] [blame] | 143 | return kvm_arm_copy_coproc_indices(vcpu, uindices); |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 147 | { |
| 148 | /* We currently use nothing arch-specific in upper 32 bits */ |
| 149 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) |
| 150 | return -EINVAL; |
| 151 | |
| 152 | /* Register group 16 means we want a core register. */ |
| 153 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) |
| 154 | return get_core_reg(vcpu, reg); |
| 155 | |
Christoffer Dall | 1138245 | 2013-01-20 18:28:10 -0500 | [diff] [blame] | 156 | return kvm_arm_coproc_get_reg(vcpu, reg); |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 160 | { |
| 161 | /* We currently use nothing arch-specific in upper 32 bits */ |
| 162 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32) |
| 163 | return -EINVAL; |
| 164 | |
| 165 | /* Register group 16 means we set a core register. */ |
| 166 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) |
| 167 | return set_core_reg(vcpu, reg); |
| 168 | |
Christoffer Dall | 1138245 | 2013-01-20 18:28:10 -0500 | [diff] [blame] | 169 | return kvm_arm_coproc_set_reg(vcpu, reg); |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, |
| 173 | struct kvm_sregs *sregs) |
| 174 | { |
| 175 | return -EINVAL; |
| 176 | } |
| 177 | |
| 178 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, |
| 179 | struct kvm_sregs *sregs) |
| 180 | { |
| 181 | return -EINVAL; |
| 182 | } |
| 183 | |
Marc Zyngier | 728d577 | 2012-10-15 12:09:45 +0100 | [diff] [blame] | 184 | int __attribute_const__ kvm_target_cpu(void) |
| 185 | { |
| 186 | unsigned long implementor = read_cpuid_implementor(); |
| 187 | unsigned long part_number = read_cpuid_part_number(); |
| 188 | |
| 189 | if (implementor != ARM_CPU_IMP_ARM) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | switch (part_number) { |
Jonathan Austin | e8c2d99 | 2013-09-26 16:49:28 +0100 | [diff] [blame] | 193 | case ARM_CPU_PART_CORTEX_A7: |
| 194 | return KVM_ARM_TARGET_CORTEX_A7; |
Marc Zyngier | 728d577 | 2012-10-15 12:09:45 +0100 | [diff] [blame] | 195 | case ARM_CPU_PART_CORTEX_A15: |
| 196 | return KVM_ARM_TARGET_CORTEX_A15; |
| 197 | default: |
| 198 | return -EINVAL; |
| 199 | } |
| 200 | } |
| 201 | |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 202 | int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, |
| 203 | const struct kvm_vcpu_init *init) |
| 204 | { |
| 205 | unsigned int i; |
| 206 | |
Jonathan Austin | e8c2d99 | 2013-09-26 16:49:28 +0100 | [diff] [blame] | 207 | /* We can only cope with guest==host and only on A15/A7 (for now). */ |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 208 | if (init->target != kvm_target_cpu()) |
| 209 | return -EINVAL; |
| 210 | |
| 211 | vcpu->arch.target = init->target; |
| 212 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); |
| 213 | |
| 214 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ |
| 215 | for (i = 0; i < sizeof(init->features) * 8; i++) { |
| 216 | if (test_bit(i, (void *)init->features)) { |
| 217 | if (i >= KVM_VCPU_MAX_FEATURES) |
| 218 | return -ENOENT; |
| 219 | set_bit(i, vcpu->arch.features); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Now we know what it is, we can reset it. */ |
| 224 | return kvm_reset_vcpu(vcpu); |
| 225 | } |
| 226 | |
Anup Patel | 4a6fee8 | 2013-09-30 14:20:05 +0530 | [diff] [blame] | 227 | int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init) |
| 228 | { |
| 229 | int target = kvm_target_cpu(); |
| 230 | |
| 231 | if (target < 0) |
| 232 | return -ENODEV; |
| 233 | |
| 234 | memset(init, 0, sizeof(*init)); |
| 235 | |
| 236 | /* |
| 237 | * For now, we don't return any features. |
| 238 | * In future, we might use features to return target |
| 239 | * specific features available for the preferred |
| 240 | * target type. |
| 241 | */ |
| 242 | init->target = (__u32)target; |
| 243 | |
| 244 | return 0; |
| 245 | } |
| 246 | |
Christoffer Dall | 749cf76c | 2013-01-20 18:28:06 -0500 | [diff] [blame] | 247 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| 248 | { |
| 249 | return -EINVAL; |
| 250 | } |
| 251 | |
| 252 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| 253 | { |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | |
| 257 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, |
| 258 | struct kvm_translation *tr) |
| 259 | { |
| 260 | return -EINVAL; |
| 261 | } |