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