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