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 static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num) 103 { 104 if (vcpu_mode_is_32bit(vcpu)) 105 return vcpu_reg32(vcpu, reg_num); 106 107 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num]; 108 } 109 110 /* Get vcpu SPSR for current mode */ 111 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu) 112 { 113 if (vcpu_mode_is_32bit(vcpu)) 114 return vcpu_spsr32(vcpu); 115 116 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; 117 } 118 119 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) 120 { 121 u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; 122 123 if (vcpu_mode_is_32bit(vcpu)) 124 return mode > COMPAT_PSR_MODE_USR; 125 126 return mode != PSR_MODE_EL0t; 127 } 128 129 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) 130 { 131 return vcpu->arch.fault.esr_el2; 132 } 133 134 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) 135 { 136 return vcpu->arch.fault.far_el2; 137 } 138 139 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) 140 { 141 return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; 142 } 143 144 static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu) 145 { 146 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK; 147 } 148 149 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) 150 { 151 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV); 152 } 153 154 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) 155 { 156 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR); 157 } 158 159 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) 160 { 161 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE); 162 } 163 164 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) 165 { 166 return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT; 167 } 168 169 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) 170 { 171 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA); 172 } 173 174 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) 175 { 176 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW); 177 } 178 179 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) 180 { 181 return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT); 182 } 183 184 /* This one is not specific to Data Abort */ 185 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) 186 { 187 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL); 188 } 189 190 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) 191 { 192 return kvm_vcpu_get_hsr(vcpu) >> ESR_ELx_EC_SHIFT; 193 } 194 195 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) 196 { 197 return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW; 198 } 199 200 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) 201 { 202 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC; 203 } 204 205 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) 206 { 207 return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE; 208 } 209 210 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu) 211 { 212 return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK; 213 } 214 215 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) 216 { 217 if (vcpu_mode_is_32bit(vcpu)) 218 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT; 219 else 220 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25); 221 } 222 223 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) 224 { 225 if (vcpu_mode_is_32bit(vcpu)) 226 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT); 227 228 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); 229 } 230 231 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, 232 unsigned long data, 233 unsigned int len) 234 { 235 if (kvm_vcpu_is_be(vcpu)) { 236 switch (len) { 237 case 1: 238 return data & 0xff; 239 case 2: 240 return be16_to_cpu(data & 0xffff); 241 case 4: 242 return be32_to_cpu(data & 0xffffffff); 243 default: 244 return be64_to_cpu(data); 245 } 246 } else { 247 switch (len) { 248 case 1: 249 return data & 0xff; 250 case 2: 251 return le16_to_cpu(data & 0xffff); 252 case 4: 253 return le32_to_cpu(data & 0xffffffff); 254 default: 255 return le64_to_cpu(data); 256 } 257 } 258 259 return data; /* Leave LE untouched */ 260 } 261 262 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, 263 unsigned long data, 264 unsigned int len) 265 { 266 if (kvm_vcpu_is_be(vcpu)) { 267 switch (len) { 268 case 1: 269 return data & 0xff; 270 case 2: 271 return cpu_to_be16(data & 0xffff); 272 case 4: 273 return cpu_to_be32(data & 0xffffffff); 274 default: 275 return cpu_to_be64(data); 276 } 277 } else { 278 switch (len) { 279 case 1: 280 return data & 0xff; 281 case 2: 282 return cpu_to_le16(data & 0xffff); 283 case 4: 284 return cpu_to_le32(data & 0xffffffff); 285 default: 286 return cpu_to_le64(data); 287 } 288 } 289 290 return data; /* Leave LE untouched */ 291 } 292 293 #endif /* __ARM64_KVM_EMULATE_H__ */ 294