arch/arm64/include/asm/kvm_emulate.h

   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 void kvm_inject_undef32(struct kvm_vcpu *vcpu);
  45 void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr);
  46 void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr);
  47
  48 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  49 {
  50         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
  51         if (is_kernel_in_hyp_mode())
  52                 vcpu->arch.hcr_el2 |= HCR_E2H;
  53         if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
  54                 /* route synchronous external abort exceptions to EL2 */
  55                 vcpu->arch.hcr_el2 |= HCR_TEA;
  56                 /* trap error record accesses */
  57                 vcpu->arch.hcr_el2 |= HCR_TERR;
  58         }
  59
  60         if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
  61                 vcpu->arch.hcr_el2 &= ~HCR_RW;
  62 }
  63
  64 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu)
  65 {
  66         return vcpu->arch.hcr_el2;
  67 }
  68
  69 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
  70 {
  71         vcpu->arch.hcr_el2 = hcr;
  72 }
  73
  74 static inline void vcpu_set_vsesr(struct kvm_vcpu *vcpu, u64 vsesr)
  75 {
  76         vcpu->arch.vsesr_el2 = vsesr;
  77 }
  78
  79 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
  80 {
  81         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
  82 }
  83
  84 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu)
  85 {
  86         return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
  87 }
  88
  89 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
  90 {
  91         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
  92 }
  93
  94 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
  95 {
  96         return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
  97 }
  98
  99 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
 100 {
 101         if (vcpu_mode_is_32bit(vcpu))
 102                 return kvm_condition_valid32(vcpu);
 103
 104         return true;
 105 }
 106
 107 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
 108 {
 109         if (vcpu_mode_is_32bit(vcpu))
 110                 kvm_skip_instr32(vcpu, is_wide_instr);
 111         else
 112                 *vcpu_pc(vcpu) += 4;
 113 }
 114
 115 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
 116 {
 117         *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
 118 }
 119
 120 /*
 121  * vcpu_get_reg and vcpu_set_reg should always be passed a register number
 122  * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
 123  * AArch32 with banked registers.
 124  */
 125 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
 126                                          u8 reg_num)
 127 {
 128         return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num];
 129 }
 130
 131 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
 132                                 unsigned long val)
 133 {
 134         if (reg_num != 31)
 135                 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val;
 136 }
 137
 138 /* Get vcpu SPSR for current mode */
 139 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
 140 {
 141         if (vcpu_mode_is_32bit(vcpu))
 142                 return vcpu_spsr32(vcpu);
 143
 144         return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
 145 }
 146
 147 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 148 {
 149         u32 mode;
 150
 151         if (vcpu_mode_is_32bit(vcpu)) {
 152                 mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
 153                 return mode > COMPAT_PSR_MODE_USR;
 154         }
 155
 156         mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 157
 158         return mode != PSR_MODE_EL0t;
 159 }
 160
 161 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
 162 {
 163         return vcpu->arch.fault.esr_el2;
 164 }
 165
 166 static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
 167 {
 168         u32 esr = kvm_vcpu_get_hsr(vcpu);
 169
 170         if (esr & ESR_ELx_CV)
 171                 return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
 172
 173         return -1;
 174 }
 175
 176 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
 177 {
 178         return vcpu->arch.fault.far_el2;
 179 }
 180
 181 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
 182 {
 183         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
 184 }
 185
 186 static inline u64 kvm_vcpu_get_disr(const struct kvm_vcpu *vcpu)
 187 {
 188         return vcpu->arch.fault.disr_el1;
 189 }
 190
 191 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
 192 {
 193         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
 194 }
 195
 196 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
 197 {
 198         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
 199 }
 200
 201 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
 202 {
 203         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
 204 }
 205
 206 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
 207 {
 208         return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
 209 }
 210
 211 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
 212 {
 213         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
 214 }
 215
 216 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 217 {
 218         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR) ||
 219                 kvm_vcpu_dabt_iss1tw(vcpu); /* AF/DBM update */
 220 }
 221
 222 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
 223 {
 224         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM);
 225 }
 226
 227 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
 228 {
 229         return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
 230 }
 231
 232 /* This one is not specific to Data Abort */
 233 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 234 {
 235         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
 236 }
 237
 238 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 239 {
 240         return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
 241 }
 242
 243 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
 244 {
 245         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
 246 }
 247
 248 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
 249 {
 250         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
 251 }
 252
 253 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
 254 {
 255         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
 256 }
 257
 258 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
 259 {
 260         switch (kvm_vcpu_trap_get_fault(vcpu)) {
 261         case FSC_SEA:
 262         case FSC_SEA_TTW0:
 263         case FSC_SEA_TTW1:
 264         case FSC_SEA_TTW2:
 265         case FSC_SEA_TTW3:
 266         case FSC_SECC:
 267         case FSC_SECC_TTW0:
 268         case FSC_SECC_TTW1:
 269         case FSC_SECC_TTW2:
 270         case FSC_SECC_TTW3:
 271                 return true;
 272         default:
 273                 return false;
 274         }
 275 }
 276
 277 static inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
 278 {
 279         u32 esr = kvm_vcpu_get_hsr(vcpu);
 280         return (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
 281 }
 282
 283 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 284 {
 285         return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
 286 }
 287
 288 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 289 {
 290         if (vcpu_mode_is_32bit(vcpu))
 291                 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT;
 292         else
 293                 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25);
 294 }
 295
 296 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 297 {
 298         if (vcpu_mode_is_32bit(vcpu))
 299                 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
 300
 301         return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
 302 }
 303
 304 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 305                                                     unsigned long data,
 306                                                     unsigned int len)
 307 {
 308         if (kvm_vcpu_is_be(vcpu)) {
 309                 switch (len) {
 310                 case 1:
 311                         return data & 0xff;
 312                 case 2:
 313                         return be16_to_cpu(data & 0xffff);
 314                 case 4:
 315                         return be32_to_cpu(data & 0xffffffff);
 316                 default:
 317                         return be64_to_cpu(data);
 318                 }
 319         } else {
 320                 switch (len) {
 321                 case 1:
 322                         return data & 0xff;
 323                 case 2:
 324                         return le16_to_cpu(data & 0xffff);
 325                 case 4:
 326                         return le32_to_cpu(data & 0xffffffff);
 327                 default:
 328                         return le64_to_cpu(data);
 329                 }
 330         }
 331
 332         return data;            /* Leave LE untouched */
 333 }
 334
 335 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 336                                                     unsigned long data,
 337                                                     unsigned int len)
 338 {
 339         if (kvm_vcpu_is_be(vcpu)) {
 340                 switch (len) {
 341                 case 1:
 342                         return data & 0xff;
 343                 case 2:
 344                         return cpu_to_be16(data & 0xffff);
 345                 case 4:
 346                         return cpu_to_be32(data & 0xffffffff);
 347                 default:
 348                         return cpu_to_be64(data);
 349                 }
 350         } else {
 351                 switch (len) {
 352                 case 1:
 353                         return data & 0xff;
 354                 case 2:
 355                         return cpu_to_le16(data & 0xffff);
 356                 case 4:
 357                         return cpu_to_le32(data & 0xffffffff);
 358                 default:
 359                         return cpu_to_le64(data);
 360                 }
 361         }
 362
 363         return data;            /* Leave LE untouched */
 364 }
 365
 366 #endif /* __ARM64_KVM_EMULATE_H__ */