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 #include <asm/kvm_asm.h> 27 #include <asm/kvm_arm.h> 28 #include <asm/kvm_mmio.h> 29 #include <asm/ptrace.h> 30 31 unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); 32 unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu); 33 34 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); 35 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); 36 37 void kvm_inject_undefined(struct kvm_vcpu *vcpu); 38 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr); 39 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr); 40 41 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu) 42 { 43 vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS; 44 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) 45 vcpu->arch.hcr_el2 &= ~HCR_RW; 46 } 47 48 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu) 49 { 50 return vcpu->arch.hcr_el2; 51 } 52 53 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr) 54 { 55 vcpu->arch.hcr_el2 = hcr; 56 } 57 58 static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) 59 { 60 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc; 61 } 62 63 static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu) 64 { 65 return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1; 66 } 67 68 static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) 69 { 70 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate; 71 } 72 73 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) 74 { 75 return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); 76 } 77 78 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu) 79 { 80 if (vcpu_mode_is_32bit(vcpu)) 81 return kvm_condition_valid32(vcpu); 82 83 return true; 84 } 85 86 static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr) 87 { 88 if (vcpu_mode_is_32bit(vcpu)) 89 kvm_skip_instr32(vcpu, is_wide_instr); 90 else 91 *vcpu_pc(vcpu) += 4; 92 } 93 94 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) 95 { 96 *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT; 97 } 98 99 static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num) 100 { 101 if (vcpu_mode_is_32bit(vcpu)) 102 return vcpu_reg32(vcpu, reg_num); 103 104 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num]; 105 } 106 107 /* Get vcpu SPSR for current mode */ 108 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu) 109 { 110 if (vcpu_mode_is_32bit(vcpu)) 111 return vcpu_spsr32(vcpu); 112 113 return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; 114 } 115 116 static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) 117 { 118 u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; 119 120 if (vcpu_mode_is_32bit(vcpu)) 121 return mode > COMPAT_PSR_MODE_USR; 122 123 return mode != PSR_MODE_EL0t; 124 } 125 126 static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) 127 { 128 return vcpu->arch.fault.esr_el2; 129 } 130 131 static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) 132 { 133 return vcpu->arch.fault.far_el2; 134 } 135 136 static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu) 137 { 138 return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8; 139 } 140 141 static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) 142 { 143 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_ISV); 144 } 145 146 static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) 147 { 148 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_WNR); 149 } 150 151 static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) 152 { 153 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SSE); 154 } 155 156 static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu) 157 { 158 return (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SRT_MASK) >> ESR_EL2_SRT_SHIFT; 159 } 160 161 static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) 162 { 163 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EA); 164 } 165 166 static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) 167 { 168 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_S1PTW); 169 } 170 171 static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu) 172 { 173 return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SAS) >> ESR_EL2_SAS_SHIFT); 174 } 175 176 /* This one is not specific to Data Abort */ 177 static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu) 178 { 179 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_IL); 180 } 181 182 static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu) 183 { 184 return kvm_vcpu_get_hsr(vcpu) >> ESR_EL2_EC_SHIFT; 185 } 186 187 static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu) 188 { 189 return kvm_vcpu_trap_get_class(vcpu) == ESR_EL2_EC_IABT; 190 } 191 192 static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) 193 { 194 return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC; 195 } 196 197 static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) 198 { 199 return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE; 200 } 201 202 static inline unsigned long kvm_vcpu_get_mpidr(struct kvm_vcpu *vcpu) 203 { 204 return vcpu_sys_reg(vcpu, MPIDR_EL1); 205 } 206 207 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) 208 { 209 if (vcpu_mode_is_32bit(vcpu)) 210 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT; 211 else 212 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25); 213 } 214 215 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) 216 { 217 if (vcpu_mode_is_32bit(vcpu)) 218 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT); 219 220 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); 221 } 222 223 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, 224 unsigned long data, 225 unsigned int len) 226 { 227 if (kvm_vcpu_is_be(vcpu)) { 228 switch (len) { 229 case 1: 230 return data & 0xff; 231 case 2: 232 return be16_to_cpu(data & 0xffff); 233 case 4: 234 return be32_to_cpu(data & 0xffffffff); 235 default: 236 return be64_to_cpu(data); 237 } 238 } else { 239 switch (len) { 240 case 1: 241 return data & 0xff; 242 case 2: 243 return le16_to_cpu(data & 0xffff); 244 case 4: 245 return le32_to_cpu(data & 0xffffffff); 246 default: 247 return le64_to_cpu(data); 248 } 249 } 250 251 return data; /* Leave LE untouched */ 252 } 253 254 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, 255 unsigned long data, 256 unsigned int len) 257 { 258 if (kvm_vcpu_is_be(vcpu)) { 259 switch (len) { 260 case 1: 261 return data & 0xff; 262 case 2: 263 return cpu_to_be16(data & 0xffff); 264 case 4: 265 return cpu_to_be32(data & 0xffffffff); 266 default: 267 return cpu_to_be64(data); 268 } 269 } else { 270 switch (len) { 271 case 1: 272 return data & 0xff; 273 case 2: 274 return cpu_to_le16(data & 0xffff); 275 case 4: 276 return cpu_to_le32(data & 0xffffffff); 277 default: 278 return cpu_to_le64(data); 279 } 280 } 281 282 return data; /* Leave LE untouched */ 283 } 284 285 #endif /* __ARM64_KVM_EMULATE_H__ */ 286