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_asm.h>
  30 #include <asm/kvm_mmio.h>
  31 #include <asm/ptrace.h>
  32 #include <asm/cputype.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_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
  42 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
  43
  44 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  45 {
  46         vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
  47 }
  48
  49 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
  50 {
  51         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
  52 }
  53
  54 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu)
  55 {
  56         return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
  57 }
  58
  59 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
  60 {
  61         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
  62 }
  63
  64 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
  65 {
  66         return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
  67 }
  68
  69 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
  70 {
  71         if (vcpu_mode_is_32bit(vcpu))
  72                 return kvm_condition_valid32(vcpu);
  73
  74         return true;
  75 }
  76
  77 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
  78 {
  79         if (vcpu_mode_is_32bit(vcpu))
  80                 kvm_skip_instr32(vcpu, is_wide_instr);
  81         else
  82                 *vcpu_pc(vcpu) += 4;
  83 }
  84
  85 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
  86 {
  87         *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
  88 }
  89
  90 static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num)
  91 {
  92         if (vcpu_mode_is_32bit(vcpu))
  93                 return vcpu_reg32(vcpu, reg_num);
  94
  95         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num];
  96 }
  97
  98 /* Get vcpu SPSR for current mode */
  99 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
 100 {
 101         if (vcpu_mode_is_32bit(vcpu))
 102                 return vcpu_spsr32(vcpu);
 103
 104         return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
 105 }
 106
 107 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 108 {
 109         u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 110
 111         if (vcpu_mode_is_32bit(vcpu))
 112                 return mode > COMPAT_PSR_MODE_USR;
 113
 114         return mode != PSR_MODE_EL0t;
 115 }
 116
 117 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
 118 {
 119         return vcpu->arch.fault.esr_el2;
 120 }
 121
 122 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
 123 {
 124         return vcpu->arch.fault.far_el2;
 125 }
 126
 127 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
 128 {
 129         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
 130 }
 131
 132 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
 133 {
 134         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
 135 }
 136
 137 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
 138 {
 139         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
 140 }
 141
 142 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 143 {
 144         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR);
 145 }
 146
 147 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
 148 {
 149         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
 150 }
 151
 152 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
 153 {
 154         return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
 155 }
 156
 157 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
 158 {
 159         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA);
 160 }
 161
 162 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
 163 {
 164         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
 165 }
 166
 167 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
 168 {
 169         return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
 170 }
 171
 172 /* This one is not specific to Data Abort */
 173 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 174 {
 175         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
 176 }
 177
 178 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 179 {
 180         return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT;
 181 }
 182
 183 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
 184 {
 185         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
 186 }
 187
 188 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
 189 {
 190         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
 191 }
 192
 193 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
 194 {
 195         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
 196 }
 197
 198 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 199 {
 200         return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
 201 }
 202
 203 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 204 {
 205         if (vcpu_mode_is_32bit(vcpu))
 206                 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT;
 207         else
 208                 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25);
 209 }
 210
 211 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 212 {
 213         if (vcpu_mode_is_32bit(vcpu))
 214                 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
 215
 216         return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
 217 }
 218
 219 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 220                                                     unsigned long data,
 221                                                     unsigned int len)
 222 {
 223         if (kvm_vcpu_is_be(vcpu)) {
 224                 switch (len) {
 225                 case 1:
 226                         return data & 0xff;
 227                 case 2:
 228                         return be16_to_cpu(data & 0xffff);
 229                 case 4:
 230                         return be32_to_cpu(data & 0xffffffff);
 231                 default:
 232                         return be64_to_cpu(data);
 233                 }
 234         } else {
 235                 switch (len) {
 236                 case 1:
 237                         return data & 0xff;
 238                 case 2:
 239                         return le16_to_cpu(data & 0xffff);
 240                 case 4:
 241                         return le32_to_cpu(data & 0xffffffff);
 242                 default:
 243                         return le64_to_cpu(data);
 244                 }
 245         }
 246
 247         return data;            /* Leave LE untouched */
 248 }
 249
 250 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 251                                                     unsigned long data,
 252                                                     unsigned int len)
 253 {
 254         if (kvm_vcpu_is_be(vcpu)) {
 255                 switch (len) {
 256                 case 1:
 257                         return data & 0xff;
 258                 case 2:
 259                         return cpu_to_be16(data & 0xffff);
 260                 case 4:
 261                         return cpu_to_be32(data & 0xffffffff);
 262                 default:
 263                         return cpu_to_be64(data);
 264                 }
 265         } else {
 266                 switch (len) {
 267                 case 1:
 268                         return data & 0xff;
 269                 case 2:
 270                         return cpu_to_le16(data & 0xffff);
 271                 case 4:
 272                         return cpu_to_le32(data & 0xffffffff);
 273                 default:
 274                         return cpu_to_le64(data);
 275                 }
 276         }
 277
 278         return data;            /* Leave LE untouched */
 279 }
 280
 281 #endif /* __ARM64_KVM_EMULATE_H__ */