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_reg should always be passed a register number coming from a
 104  * read of ESR_EL2. Otherwise, it may give the wrong result on AArch32
 105  * with banked registers.
 106  */
 107 static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num)
 108 {
 109         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num];
 110 }
 111
 112 /* Get vcpu SPSR for current mode */
 113 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
 114 {
 115         if (vcpu_mode_is_32bit(vcpu))
 116                 return vcpu_spsr32(vcpu);
 117
 118         return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
 119 }
 120
 121 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 122 {
 123         u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 124
 125         if (vcpu_mode_is_32bit(vcpu))
 126                 return mode > COMPAT_PSR_MODE_USR;
 127
 128         return mode != PSR_MODE_EL0t;
 129 }
 130
 131 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
 132 {
 133         return vcpu->arch.fault.esr_el2;
 134 }
 135
 136 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
 137 {
 138         return vcpu->arch.fault.far_el2;
 139 }
 140
 141 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
 142 {
 143         return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
 144 }
 145
 146 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
 147 {
 148         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
 149 }
 150
 151 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
 152 {
 153         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
 154 }
 155
 156 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 157 {
 158         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR);
 159 }
 160
 161 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
 162 {
 163         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
 164 }
 165
 166 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
 167 {
 168         return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
 169 }
 170
 171 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
 172 {
 173         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA);
 174 }
 175
 176 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
 177 {
 178         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
 179 }
 180
 181 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
 182 {
 183         return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
 184 }
 185
 186 /* This one is not specific to Data Abort */
 187 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 188 {
 189         return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
 190 }
 191
 192 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 193 {
 194         return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT;
 195 }
 196
 197 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
 198 {
 199         return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
 200 }
 201
 202 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
 203 {
 204         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
 205 }
 206
 207 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
 208 {
 209         return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
 210 }
 211
 212 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 213 {
 214         return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
 215 }
 216
 217 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 218 {
 219         if (vcpu_mode_is_32bit(vcpu))
 220                 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT;
 221         else
 222                 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25);
 223 }
 224
 225 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 226 {
 227         if (vcpu_mode_is_32bit(vcpu))
 228                 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
 229
 230         return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
 231 }
 232
 233 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 234                                                     unsigned long data,
 235                                                     unsigned int len)
 236 {
 237         if (kvm_vcpu_is_be(vcpu)) {
 238                 switch (len) {
 239                 case 1:
 240                         return data & 0xff;
 241                 case 2:
 242                         return be16_to_cpu(data & 0xffff);
 243                 case 4:
 244                         return be32_to_cpu(data & 0xffffffff);
 245                 default:
 246                         return be64_to_cpu(data);
 247                 }
 248         } else {
 249                 switch (len) {
 250                 case 1:
 251                         return data & 0xff;
 252                 case 2:
 253                         return le16_to_cpu(data & 0xffff);
 254                 case 4:
 255                         return le32_to_cpu(data & 0xffffffff);
 256                 default:
 257                         return le64_to_cpu(data);
 258                 }
 259         }
 260
 261         return data;            /* Leave LE untouched */
 262 }
 263
 264 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 265                                                     unsigned long data,
 266                                                     unsigned int len)
 267 {
 268         if (kvm_vcpu_is_be(vcpu)) {
 269                 switch (len) {
 270                 case 1:
 271                         return data & 0xff;
 272                 case 2:
 273                         return cpu_to_be16(data & 0xffff);
 274                 case 4:
 275                         return cpu_to_be32(data & 0xffffffff);
 276                 default:
 277                         return cpu_to_be64(data);
 278                 }
 279         } else {
 280                 switch (len) {
 281                 case 1:
 282                         return data & 0xff;
 283                 case 2:
 284                         return cpu_to_le16(data & 0xffff);
 285                 case 4:
 286                         return cpu_to_le32(data & 0xffffffff);
 287                 default:
 288                         return cpu_to_le64(data);
 289                 }
 290         }
 291
 292         return data;            /* Leave LE untouched */
 293 }
 294
 295 #endif /* __ARM64_KVM_EMULATE_H__ */