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_mmio.h> 30 #include <asm/ptrace.h> 31 #include <asm/cputype.h> 32 #include <asm/virt.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 (is_kernel_in_hyp_mode()) 48 vcpu->arch.hcr_el2 |= HCR_E2H; 49 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) 50 vcpu->arch.hcr_el2 &= ~HCR_RW; 51 } 52 53 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu) 54 { 55 return vcpu->arch.hcr_el2; 56 } 57 58 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr) 59 { 60 vcpu->arch.hcr_el2 = hcr; 61 } 62 63 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) 64 { 65 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc; 66 } 67 68 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu) 69 { 70 return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1; 71 } 72 73 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) 74 { 75 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate; 76 } 77 78 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) 79 { 80 return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); 81 } 82 83 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu) 84 { 85 if (vcpu_mode_is_32bit(vcpu)) 86 return kvm_condition_valid32(vcpu); 87 88 return true; 89 } 90 91 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr) 92 { 93 if (vcpu_mode_is_32bit(vcpu)) 94 kvm_skip_instr32(vcpu, is_wide_instr); 95 else 96 *vcpu_pc(vcpu) += 4; 97 } 98 99 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) 100 { 101 *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT; 102 } 103 104 /* 105 * vcpu_get_reg and vcpu_set_reg should always be passed a register number 106 * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on 107 * AArch32 with banked registers. 108 */ 109 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu, 110 u8 reg_num) 111 { 112 return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num]; 113 } 114 115 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num, 116 unsigned long val) 117 { 118 if (reg_num != 31) 119 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val; 120 } 121 122 /* Get vcpu SPSR for current mode */ 123 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu) 124 { 125 if (vcpu_mode_is_32bit(vcpu)) 126 return vcpu_spsr32(vcpu); 127 128 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; 129 } 130 131 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) 132 { 133 u32 mode; 134 135 if (vcpu_mode_is_32bit(vcpu)) { 136 mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK; 137 return mode > COMPAT_PSR_MODE_USR; 138 } 139 140 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; 141 142 return mode != PSR_MODE_EL0t; 143 } 144 145 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) 146 { 147 return vcpu->arch.fault.esr_el2; 148 } 149 150 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) 151 { 152 return vcpu->arch.fault.far_el2; 153 } 154 155 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) 156 { 157 return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; 158 } 159 160 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu) 161 { 162 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK; 163 } 164 165 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) 166 { 167 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV); 168 } 169 170 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) 171 { 172 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR); 173 } 174 175 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) 176 { 177 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE); 178 } 179 180 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) 181 { 182 return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT; 183 } 184 185 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) 186 { 187 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA); 188 } 189 190 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) 191 { 192 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW); 193 } 194 195 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu) 196 { 197 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM); 198 } 199 200 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) 201 { 202 return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT); 203 } 204 205 /* This one is not specific to Data Abort */ 206 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) 207 { 208 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL); 209 } 210 211 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) 212 { 213 return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT; 214 } 215 216 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) 217 { 218 return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW; 219 } 220 221 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) 222 { 223 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC; 224 } 225 226 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) 227 { 228 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE; 229 } 230 231 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu) 232 { 233 return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK; 234 } 235 236 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) 237 { 238 if (vcpu_mode_is_32bit(vcpu)) 239 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT; 240 else 241 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25); 242 } 243 244 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) 245 { 246 if (vcpu_mode_is_32bit(vcpu)) 247 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT); 248 249 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); 250 } 251 252 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, 253 unsigned long data, 254 unsigned int len) 255 { 256 if (kvm_vcpu_is_be(vcpu)) { 257 switch (len) { 258 case 1: 259 return data & 0xff; 260 case 2: 261 return be16_to_cpu(data & 0xffff); 262 case 4: 263 return be32_to_cpu(data & 0xffffffff); 264 default: 265 return be64_to_cpu(data); 266 } 267 } else { 268 switch (len) { 269 case 1: 270 return data & 0xff; 271 case 2: 272 return le16_to_cpu(data & 0xffff); 273 case 4: 274 return le32_to_cpu(data & 0xffffffff); 275 default: 276 return le64_to_cpu(data); 277 } 278 } 279 280 return data; /* Leave LE untouched */ 281 } 282 283 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, 284 unsigned long data, 285 unsigned int len) 286 { 287 if (kvm_vcpu_is_be(vcpu)) { 288 switch (len) { 289 case 1: 290 return data & 0xff; 291 case 2: 292 return cpu_to_be16(data & 0xffff); 293 case 4: 294 return cpu_to_be32(data & 0xffffffff); 295 default: 296 return cpu_to_be64(data); 297 } 298 } else { 299 switch (len) { 300 case 1: 301 return data & 0xff; 302 case 2: 303 return cpu_to_le16(data & 0xffff); 304 case 4: 305 return cpu_to_le32(data & 0xffffffff); 306 default: 307 return cpu_to_le64(data); 308 } 309 } 310 311 return data; /* Leave LE untouched */ 312 } 313 314 #endif /* __ARM64_KVM_EMULATE_H__ */ 315