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