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