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__ */ 296