arch/arm/include/asm/kvm_emulate.h

   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 #ifndef __ARM_KVM_EMULATE_H__
  20 #define __ARM_KVM_EMULATE_H__
  21
  22 #include <linux/kvm_host.h>
  23 #include <asm/kvm_asm.h>
  24 #include <asm/kvm_mmio.h>
  25 #include <asm/kvm_arm.h>
  26 #include <asm/cputype.h>
  27
  28 /* arm64 compatibility macros */
  29 #define COMPAT_PSR_MODE_ABT     ABT_MODE
  30 #define COMPAT_PSR_MODE_UND     UND_MODE
  31 #define COMPAT_PSR_T_BIT        PSR_T_BIT
  32 #define COMPAT_PSR_I_BIT        PSR_I_BIT
  33 #define COMPAT_PSR_A_BIT        PSR_A_BIT
  34 #define COMPAT_PSR_E_BIT        PSR_E_BIT
  35 #define COMPAT_PSR_IT_MASK      PSR_IT_MASK
  36
  37 unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
  38
  39 static inline unsigned long *vcpu_reg32(struct kvm_vcpu *vcpu, u8 reg_num)
  40 {
  41         return vcpu_reg(vcpu, reg_num);
  42 }
  43
  44 unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
  45
  46 static inline unsigned long vcpu_get_reg(struct kvm_vcpu *vcpu,
  47                                          u8 reg_num)
  48 {
  49         return *vcpu_reg(vcpu, reg_num);
  50 }
  51
  52 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
  53                                 unsigned long val)
  54 {
  55         *vcpu_reg(vcpu, reg_num) = val;
  56 }
  57
  58 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
  59 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
  60 void kvm_inject_undef32(struct kvm_vcpu *vcpu);
  61 void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr);
  62 void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr);
  63 void kvm_inject_vabt(struct kvm_vcpu *vcpu);
  64
  65 static inline void kvm_inject_undefined(struct kvm_vcpu *vcpu)
  66 {
  67         kvm_inject_undef32(vcpu);
  68 }
  69
  70 static inline void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
  71 {
  72         kvm_inject_dabt32(vcpu, addr);
  73 }
  74
  75 static inline void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
  76 {
  77         kvm_inject_pabt32(vcpu, addr);
  78 }
  79
  80 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
  81 {
  82         return kvm_condition_valid32(vcpu);
  83 }
  84
  85 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
  86 {
  87         kvm_skip_instr32(vcpu, is_wide_instr);
  88 }
  89
  90 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  91 {
  92         vcpu->arch.hcr = HCR_GUEST_MASK;
  93 }
  94
  95 static inline unsigned long vcpu_get_hcr(const struct kvm_vcpu *vcpu)
  96 {
  97         return vcpu->arch.hcr;
  98 }
  99
 100 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
 101 {
 102         vcpu->arch.hcr = hcr;
 103 }
 104
 105 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
 106 {
 107         return 1;
 108 }
 109
 110 static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
 111 {
 112         return &vcpu->arch.ctxt.gp_regs.usr_regs.ARM_pc;
 113 }
 114
 115 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
 116 {
 117         return (unsigned long *)&vcpu->arch.ctxt.gp_regs.usr_regs.ARM_cpsr;
 118 }
 119
 120 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
 121 {
 122         *vcpu_cpsr(vcpu) |= PSR_T_BIT;
 123 }
 124
 125 static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
 126 {
 127         unsigned long cpsr_mode = vcpu->arch.ctxt.gp_regs.usr_regs.ARM_cpsr & MODE_MASK;
 128         return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
 129 }
 130
 131 static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
 132 {
 133         unsigned long cpsr_mode = vcpu->arch.ctxt.gp_regs.usr_regs.ARM_cpsr & MODE_MASK;
 134         return cpsr_mode > USR_MODE;
 135 }
 136
 137 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
 138 {
 139         return vcpu->arch.fault.hsr;
 140 }
 141
 142 static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
 143 {
 144         u32 hsr = kvm_vcpu_get_hsr(vcpu);
 145
 146         if (hsr & HSR_CV)
 147                 return (hsr & HSR_COND) >> HSR_COND_SHIFT;
 148
 149         return -1;
 150 }
 151
 152 static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
 153 {
 154         return vcpu->arch.fault.hxfar;
 155 }
 156
 157 static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
 158 {
 159         return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
 160 }
 161
 162 static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
 163 {
 164         return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
 165 }
 166
 167 static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
 168 {
 169         return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
 170 }
 171
 172 static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
 173 {
 174         return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
 175 }
 176
 177 static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
 178 {
 179         return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
 180 }
 181
 182 static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
 183 {
 184         return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
 185 }
 186
 187 static inline bool kvm_vcpu_dabt_is_cm(struct kvm_vcpu *vcpu)
 188 {
 189         return !!(kvm_vcpu_get_hsr(vcpu) & HSR_DABT_CM);
 190 }
 191
 192 /* Get Access Size from a data abort */
 193 static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
 194 {
 195         switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
 196         case 0:
 197                 return 1;
 198         case 1:
 199                 return 2;
 200         case 2:
 201                 return 4;
 202         default:
 203                 kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
 204                 return -EFAULT;
 205         }
 206 }
 207
 208 /* This one is not specific to Data Abort */
 209 static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
 210 {
 211         return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
 212 }
 213
 214 static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
 215 {
 216         return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
 217 }
 218
 219 static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
 220 {
 221         return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
 222 }
 223
 224 static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
 225 {
 226         return kvm_vcpu_get_hsr(vcpu) & HSR_FSC;
 227 }
 228
 229 static inline u8 kvm_vcpu_trap_get_fault_type(struct kvm_vcpu *vcpu)
 230 {
 231         return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
 232 }
 233
 234 static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
 235 {
 236         switch (kvm_vcpu_trap_get_fault(vcpu)) {
 237         case FSC_SEA:
 238         case FSC_SEA_TTW0:
 239         case FSC_SEA_TTW1:
 240         case FSC_SEA_TTW2:
 241         case FSC_SEA_TTW3:
 242         case FSC_SECC:
 243         case FSC_SECC_TTW0:
 244         case FSC_SECC_TTW1:
 245         case FSC_SECC_TTW2:
 246         case FSC_SECC_TTW3:
 247                 return true;
 248         default:
 249                 return false;
 250         }
 251 }
 252
 253 static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
 254 {
 255         return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
 256 }
 257
 258 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 259 {
 260         return vcpu_cp15(vcpu, c0_MPIDR) & MPIDR_HWID_BITMASK;
 261 }
 262
 263 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 264 {
 265         *vcpu_cpsr(vcpu) |= PSR_E_BIT;
 266 }
 267
 268 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 269 {
 270         return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
 271 }
 272
 273 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 274                                                     unsigned long data,
 275                                                     unsigned int len)
 276 {
 277         if (kvm_vcpu_is_be(vcpu)) {
 278                 switch (len) {
 279                 case 1:
 280                         return data & 0xff;
 281                 case 2:
 282                         return be16_to_cpu(data & 0xffff);
 283                 default:
 284                         return be32_to_cpu(data);
 285                 }
 286         } else {
 287                 switch (len) {
 288                 case 1:
 289                         return data & 0xff;
 290                 case 2:
 291                         return le16_to_cpu(data & 0xffff);
 292                 default:
 293                         return le32_to_cpu(data);
 294                 }
 295         }
 296 }
 297
 298 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 299                                                     unsigned long data,
 300                                                     unsigned int len)
 301 {
 302         if (kvm_vcpu_is_be(vcpu)) {
 303                 switch (len) {
 304                 case 1:
 305                         return data & 0xff;
 306                 case 2:
 307                         return cpu_to_be16(data & 0xffff);
 308                 default:
 309                         return cpu_to_be32(data);
 310                 }
 311         } else {
 312                 switch (len) {
 313                 case 1:
 314                         return data & 0xff;
 315                 case 2:
 316                         return cpu_to_le16(data & 0xffff);
 317                 default:
 318                         return cpu_to_le32(data);
 319                 }
 320         }
 321 }
 322
 323 #endif /* __ARM_KVM_EMULATE_H__ */