Marc Zyngier | 2f4a07c | 2012-12-10 16:37:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012,2013 - ARM Ltd |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.com> |
| 4 | * |
| 5 | * Derived from arch/arm/kvm/guest.c: |
| 6 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University |
| 7 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 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 |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/err.h> |
| 24 | #include <linux/kvm_host.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/vmalloc.h> |
| 27 | #include <linux/fs.h> |
| 28 | #include <asm/cputype.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/kvm.h> |
| 31 | #include <asm/kvm_asm.h> |
| 32 | #include <asm/kvm_emulate.h> |
| 33 | #include <asm/kvm_coproc.h> |
| 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 | vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | static u64 core_reg_offset_from_id(u64 id) |
| 46 | { |
| 47 | return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE); |
| 48 | } |
| 49 | |
| 50 | static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 51 | { |
| 52 | /* |
| 53 | * Because the kvm_regs structure is a mix of 32, 64 and |
| 54 | * 128bit fields, we index it as if it was a 32bit |
| 55 | * array. Hence below, nr_regs is the number of entries, and |
| 56 | * off the index in the "array". |
| 57 | */ |
| 58 | __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr; |
| 59 | struct kvm_regs *regs = vcpu_gp_regs(vcpu); |
| 60 | int nr_regs = sizeof(*regs) / sizeof(__u32); |
| 61 | u32 off; |
| 62 | |
| 63 | /* Our ID is an index into the kvm_regs struct. */ |
| 64 | off = core_reg_offset_from_id(reg->id); |
| 65 | if (off >= nr_regs || |
| 66 | (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs) |
| 67 | return -ENOENT; |
| 68 | |
| 69 | if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id))) |
| 70 | return -EFAULT; |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 76 | { |
| 77 | __u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr; |
| 78 | struct kvm_regs *regs = vcpu_gp_regs(vcpu); |
| 79 | int nr_regs = sizeof(*regs) / sizeof(__u32); |
| 80 | __uint128_t tmp; |
| 81 | void *valp = &tmp; |
| 82 | u64 off; |
| 83 | int err = 0; |
| 84 | |
| 85 | /* Our ID is an index into the kvm_regs struct. */ |
| 86 | off = core_reg_offset_from_id(reg->id); |
| 87 | if (off >= nr_regs || |
| 88 | (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs) |
| 89 | return -ENOENT; |
| 90 | |
| 91 | if (KVM_REG_SIZE(reg->id) > sizeof(tmp)) |
| 92 | return -EINVAL; |
| 93 | |
| 94 | if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) { |
| 95 | err = -EFAULT; |
| 96 | goto out; |
| 97 | } |
| 98 | |
| 99 | if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) { |
| 100 | u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK; |
| 101 | switch (mode) { |
Marc Zyngier | 0d854a6 | 2013-02-07 10:46:46 +0000 | [diff] [blame^] | 102 | case COMPAT_PSR_MODE_USR: |
| 103 | case COMPAT_PSR_MODE_FIQ: |
| 104 | case COMPAT_PSR_MODE_IRQ: |
| 105 | case COMPAT_PSR_MODE_SVC: |
| 106 | case COMPAT_PSR_MODE_ABT: |
| 107 | case COMPAT_PSR_MODE_UND: |
Marc Zyngier | 2f4a07c | 2012-12-10 16:37:02 +0000 | [diff] [blame] | 108 | case PSR_MODE_EL0t: |
| 109 | case PSR_MODE_EL1t: |
| 110 | case PSR_MODE_EL1h: |
| 111 | break; |
| 112 | default: |
| 113 | err = -EINVAL; |
| 114 | goto out; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id)); |
| 119 | out: |
| 120 | return err; |
| 121 | } |
| 122 | |
| 123 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| 124 | { |
| 125 | return -EINVAL; |
| 126 | } |
| 127 | |
| 128 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) |
| 129 | { |
| 130 | return -EINVAL; |
| 131 | } |
| 132 | |
| 133 | static unsigned long num_core_regs(void) |
| 134 | { |
| 135 | return sizeof(struct kvm_regs) / sizeof(__u32); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG |
| 140 | * |
| 141 | * This is for all registers. |
| 142 | */ |
| 143 | unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) |
| 144 | { |
| 145 | return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * kvm_arm_copy_reg_indices - get indices of all registers. |
| 150 | * |
| 151 | * We do core registers right here, then we apppend system regs. |
| 152 | */ |
| 153 | int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) |
| 154 | { |
| 155 | unsigned int i; |
| 156 | const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE; |
| 157 | |
| 158 | for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) { |
| 159 | if (put_user(core_reg | i, uindices)) |
| 160 | return -EFAULT; |
| 161 | uindices++; |
| 162 | } |
| 163 | |
| 164 | return kvm_arm_copy_sys_reg_indices(vcpu, uindices); |
| 165 | } |
| 166 | |
| 167 | int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 168 | { |
| 169 | /* We currently use nothing arch-specific in upper 32 bits */ |
| 170 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32) |
| 171 | return -EINVAL; |
| 172 | |
| 173 | /* Register group 16 means we want a core register. */ |
| 174 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) |
| 175 | return get_core_reg(vcpu, reg); |
| 176 | |
| 177 | return kvm_arm_sys_reg_get_reg(vcpu, reg); |
| 178 | } |
| 179 | |
| 180 | int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) |
| 181 | { |
| 182 | /* We currently use nothing arch-specific in upper 32 bits */ |
| 183 | if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32) |
| 184 | return -EINVAL; |
| 185 | |
| 186 | /* Register group 16 means we set a core register. */ |
| 187 | if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE) |
| 188 | return set_core_reg(vcpu, reg); |
| 189 | |
| 190 | return kvm_arm_sys_reg_set_reg(vcpu, reg); |
| 191 | } |
| 192 | |
| 193 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, |
| 194 | struct kvm_sregs *sregs) |
| 195 | { |
| 196 | return -EINVAL; |
| 197 | } |
| 198 | |
| 199 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, |
| 200 | struct kvm_sregs *sregs) |
| 201 | { |
| 202 | return -EINVAL; |
| 203 | } |
| 204 | |
| 205 | int __attribute_const__ kvm_target_cpu(void) |
| 206 | { |
| 207 | unsigned long implementor = read_cpuid_implementor(); |
| 208 | unsigned long part_number = read_cpuid_part_number(); |
| 209 | |
| 210 | if (implementor != ARM_CPU_IMP_ARM) |
| 211 | return -EINVAL; |
| 212 | |
| 213 | switch (part_number) { |
| 214 | case ARM_CPU_PART_AEM_V8: |
| 215 | return KVM_ARM_TARGET_AEM_V8; |
| 216 | case ARM_CPU_PART_FOUNDATION: |
| 217 | return KVM_ARM_TARGET_FOUNDATION_V8; |
| 218 | case ARM_CPU_PART_CORTEX_A57: |
| 219 | /* Currently handled by the generic backend */ |
| 220 | return KVM_ARM_TARGET_CORTEX_A57; |
| 221 | default: |
| 222 | return -EINVAL; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, |
| 227 | const struct kvm_vcpu_init *init) |
| 228 | { |
| 229 | unsigned int i; |
| 230 | int phys_target = kvm_target_cpu(); |
| 231 | |
| 232 | if (init->target != phys_target) |
| 233 | return -EINVAL; |
| 234 | |
| 235 | vcpu->arch.target = phys_target; |
| 236 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); |
| 237 | |
| 238 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ |
| 239 | for (i = 0; i < sizeof(init->features) * 8; i++) { |
| 240 | if (init->features[i / 32] & (1 << (i % 32))) { |
| 241 | if (i >= KVM_VCPU_MAX_FEATURES) |
| 242 | return -ENOENT; |
| 243 | set_bit(i, vcpu->arch.features); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /* Now we know what it is, we can reset it. */ |
| 248 | return kvm_reset_vcpu(vcpu); |
| 249 | } |
| 250 | |
| 251 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| 252 | { |
| 253 | return -EINVAL; |
| 254 | } |
| 255 | |
| 256 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) |
| 257 | { |
| 258 | return -EINVAL; |
| 259 | } |
| 260 | |
| 261 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, |
| 262 | struct kvm_translation *tr) |
| 263 | { |
| 264 | return -EINVAL; |
| 265 | } |