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__ */ 304