1 /* 2 * Copyright (C) 2012,2013 - ARM Ltd 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * Derived from arch/arm/include/kvm_emulate.h 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 #ifndef __ARM64_KVM_EMULATE_H__ 23 #define __ARM64_KVM_EMULATE_H__ 24 25 #include <linux/kvm_host.h> 26 27 #include <asm/esr.h> 28 #include <asm/kvm_arm.h> 29 #include <asm/kvm_mmio.h> 30 #include <asm/ptrace.h> 31 #include <asm/cputype.h> 32 #include <asm/virt.h> 33 34 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); 35 unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu); 36 37 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); 38 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); 39 40 void kvm_inject_undefined(struct kvm_vcpu *vcpu); 41 void kvm_inject_vabt(struct kvm_vcpu *vcpu); 42 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr); 43 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr); 44 45 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu) 46 { 47 vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; 48 if (is_kernel_in_hyp_mode()) 49 vcpu->arch.hcr_el2 |= HCR_E2H; 50 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) 51 vcpu->arch.hcr_el2 &= ~HCR_RW; 52 } 53 54 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu) 55 { 56 return vcpu->arch.hcr_el2; 57 } 58 59 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr) 60 { 61 vcpu->arch.hcr_el2 = hcr; 62 } 63 64 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) 65 { 66 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc; 67 } 68 69 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu) 70 { 71 return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1; 72 } 73 74 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) 75 { 76 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate; 77 } 78 79 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) 80 { 81 return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); 82 } 83 84 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu) 85 { 86 if (vcpu_mode_is_32bit(vcpu)) 87 return kvm_condition_valid32(vcpu); 88 89 return true; 90 } 91 92 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr) 93 { 94 if (vcpu_mode_is_32bit(vcpu)) 95 kvm_skip_instr32(vcpu, is_wide_instr); 96 else 97 *vcpu_pc(vcpu) += 4; 98 } 99 100 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) 101 { 102 *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT; 103 } 104 105 /* 106 * vcpu_get_reg and vcpu_set_reg should always be passed a register number 107 * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on 108 * AArch32 with banked registers. 109 */ 110 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu, 111 u8 reg_num) 112 { 113 return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num]; 114 } 115 116 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num, 117 unsigned long val) 118 { 119 if (reg_num != 31) 120 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val; 121 } 122 123 /* Get vcpu SPSR for current mode */ 124 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu) 125 { 126 if (vcpu_mode_is_32bit(vcpu)) 127 return vcpu_spsr32(vcpu); 128 129 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; 130 } 131 132 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) 133 { 134 u32 mode; 135 136 if (vcpu_mode_is_32bit(vcpu)) { 137 mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK; 138 return mode > COMPAT_PSR_MODE_USR; 139 } 140 141 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; 142 143 return mode != PSR_MODE_EL0t; 144 } 145 146 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) 147 { 148 return vcpu->arch.fault.esr_el2; 149 } 150 151 static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu) 152 { 153 u32 esr = kvm_vcpu_get_hsr(vcpu); 154 155 if (esr & ESR_ELx_CV) 156 return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT; 157 158 return -1; 159 } 160 161 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) 162 { 163 return vcpu->arch.fault.far_el2; 164 } 165 166 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) 167 { 168 return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; 169 } 170 171 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu) 172 { 173 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK; 174 } 175 176 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) 177 { 178 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV); 179 } 180 181 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) 182 { 183 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR); 184 } 185 186 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) 187 { 188 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE); 189 } 190 191 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) 192 { 193 return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT; 194 } 195 196 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) 197 { 198 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA); 199 } 200 201 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) 202 { 203 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW); 204 } 205 206 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu) 207 { 208 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM); 209 } 210 211 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) 212 { 213 return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT); 214 } 215 216 /* This one is not specific to Data Abort */ 217 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) 218 { 219 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL); 220 } 221 222 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) 223 { 224 return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu)); 225 } 226 227 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) 228 { 229 return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW; 230 } 231 232 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) 233 { 234 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC; 235 } 236 237 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) 238 { 239 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE; 240 } 241 242 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu) 243 { 244 return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK; 245 } 246 247 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) 248 { 249 if (vcpu_mode_is_32bit(vcpu)) 250 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT; 251 else 252 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25); 253 } 254 255 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) 256 { 257 if (vcpu_mode_is_32bit(vcpu)) 258 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT); 259 260 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); 261 } 262 263 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, 264 unsigned long data, 265 unsigned int len) 266 { 267 if (kvm_vcpu_is_be(vcpu)) { 268 switch (len) { 269 case 1: 270 return data & 0xff; 271 case 2: 272 return be16_to_cpu(data & 0xffff); 273 case 4: 274 return be32_to_cpu(data & 0xffffffff); 275 default: 276 return be64_to_cpu(data); 277 } 278 } else { 279 switch (len) { 280 case 1: 281 return data & 0xff; 282 case 2: 283 return le16_to_cpu(data & 0xffff); 284 case 4: 285 return le32_to_cpu(data & 0xffffffff); 286 default: 287 return le64_to_cpu(data); 288 } 289 } 290 291 return data; /* Leave LE untouched */ 292 } 293 294 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, 295 unsigned long data, 296 unsigned int len) 297 { 298 if (kvm_vcpu_is_be(vcpu)) { 299 switch (len) { 300 case 1: 301 return data & 0xff; 302 case 2: 303 return cpu_to_be16(data & 0xffff); 304 case 4: 305 return cpu_to_be32(data & 0xffffffff); 306 default: 307 return cpu_to_be64(data); 308 } 309 } else { 310 switch (len) { 311 case 1: 312 return data & 0xff; 313 case 2: 314 return cpu_to_le16(data & 0xffff); 315 case 4: 316 return cpu_to_le32(data & 0xffffffff); 317 default: 318 return cpu_to_le64(data); 319 } 320 } 321 322 return data; /* Leave LE untouched */ 323 } 324 325 #endif /* __ARM64_KVM_EMULATE_H__ */ 326