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 33 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); 34 unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu); 35 36 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); 37 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); 38 39 void kvm_inject_undefined(struct kvm_vcpu *vcpu); 40 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr); 41 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr); 42 43 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu) 44 { 45 vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; 46 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) 47 vcpu->arch.hcr_el2 &= ~HCR_RW; 48 } 49 50 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu) 51 { 52 return vcpu->arch.hcr_el2; 53 } 54 55 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr) 56 { 57 vcpu->arch.hcr_el2 = hcr; 58 } 59 60 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) 61 { 62 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc; 63 } 64 65 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu) 66 { 67 return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1; 68 } 69 70 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) 71 { 72 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate; 73 } 74 75 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) 76 { 77 return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); 78 } 79 80 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu) 81 { 82 if (vcpu_mode_is_32bit(vcpu)) 83 return kvm_condition_valid32(vcpu); 84 85 return true; 86 } 87 88 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr) 89 { 90 if (vcpu_mode_is_32bit(vcpu)) 91 kvm_skip_instr32(vcpu, is_wide_instr); 92 else 93 *vcpu_pc(vcpu) += 4; 94 } 95 96 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) 97 { 98 *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT; 99 } 100 101 /* 102 * vcpu_get_reg and vcpu_set_reg should always be passed a register number 103 * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on 104 * AArch32 with banked registers. 105 */ 106 static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu, 107 u8 reg_num) 108 { 109 return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num]; 110 } 111 112 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num, 113 unsigned long val) 114 { 115 if (reg_num != 31) 116 vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val; 117 } 118 119 /* Get vcpu SPSR for current mode */ 120 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu) 121 { 122 if (vcpu_mode_is_32bit(vcpu)) 123 return vcpu_spsr32(vcpu); 124 125 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; 126 } 127 128 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) 129 { 130 u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; 131 132 if (vcpu_mode_is_32bit(vcpu)) 133 return mode > COMPAT_PSR_MODE_USR; 134 135 return mode != PSR_MODE_EL0t; 136 } 137 138 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) 139 { 140 return vcpu->arch.fault.esr_el2; 141 } 142 143 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) 144 { 145 return vcpu->arch.fault.far_el2; 146 } 147 148 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) 149 { 150 return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; 151 } 152 153 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu) 154 { 155 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK; 156 } 157 158 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) 159 { 160 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV); 161 } 162 163 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) 164 { 165 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR); 166 } 167 168 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) 169 { 170 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE); 171 } 172 173 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) 174 { 175 return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT; 176 } 177 178 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) 179 { 180 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA); 181 } 182 183 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) 184 { 185 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW); 186 } 187 188 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) 189 { 190 return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT); 191 } 192 193 /* This one is not specific to Data Abort */ 194 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) 195 { 196 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL); 197 } 198 199 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) 200 { 201 return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT; 202 } 203 204 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) 205 { 206 return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW; 207 } 208 209 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) 210 { 211 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC; 212 } 213 214 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) 215 { 216 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE; 217 } 218 219 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu) 220 { 221 return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK; 222 } 223 224 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) 225 { 226 if (vcpu_mode_is_32bit(vcpu)) 227 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT; 228 else 229 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25); 230 } 231 232 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) 233 { 234 if (vcpu_mode_is_32bit(vcpu)) 235 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT); 236 237 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); 238 } 239 240 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, 241 unsigned long data, 242 unsigned int len) 243 { 244 if (kvm_vcpu_is_be(vcpu)) { 245 switch (len) { 246 case 1: 247 return data & 0xff; 248 case 2: 249 return be16_to_cpu(data & 0xffff); 250 case 4: 251 return be32_to_cpu(data & 0xffffffff); 252 default: 253 return be64_to_cpu(data); 254 } 255 } else { 256 switch (len) { 257 case 1: 258 return data & 0xff; 259 case 2: 260 return le16_to_cpu(data & 0xffff); 261 case 4: 262 return le32_to_cpu(data & 0xffffffff); 263 default: 264 return le64_to_cpu(data); 265 } 266 } 267 268 return data; /* Leave LE untouched */ 269 } 270 271 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, 272 unsigned long data, 273 unsigned int len) 274 { 275 if (kvm_vcpu_is_be(vcpu)) { 276 switch (len) { 277 case 1: 278 return data & 0xff; 279 case 2: 280 return cpu_to_be16(data & 0xffff); 281 case 4: 282 return cpu_to_be32(data & 0xffffffff); 283 default: 284 return cpu_to_be64(data); 285 } 286 } else { 287 switch (len) { 288 case 1: 289 return data & 0xff; 290 case 2: 291 return cpu_to_le16(data & 0xffff); 292 case 4: 293 return cpu_to_le32(data & 0xffffffff); 294 default: 295 return cpu_to_le64(data); 296 } 297 } 298 299 return data; /* Leave LE untouched */ 300 } 301 302 #endif /* __ARM64_KVM_EMULATE_H__ */ 303