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 31unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); 32unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu); 33 34bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); 35void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); 36 37void kvm_inject_undefined(struct kvm_vcpu *vcpu); 38void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr); 39void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr); 40 41static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu) 42{ 43 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc; 44} 45 46static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu) 47{ 48 return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1; 49} 50 51static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu) 52{ 53 return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate; 54} 55 56static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) 57{ 58 return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT); 59} 60 61static 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 69static 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 77static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu) 78{ 79 *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT; 80} 81 82static 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 */ 91static 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 99static 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 109static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) 110{ 111 return vcpu->arch.fault.esr_el2; 112} 113 114static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu) 115{ 116 return vcpu->arch.fault.far_el2; 117} 118 119static 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 124static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu) 125{ 126 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_ISV); 127} 128 129static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu) 130{ 131 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_WNR); 132} 133 134static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu) 135{ 136 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_SSE); 137} 138 139static 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 144static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu) 145{ 146 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EA); 147} 148 149static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu) 150{ 151 return !!(kvm_vcpu_get_hsr(vcpu) & ESR_EL2_S1PTW); 152} 153 154static 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 */ 160static 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 165static 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 170static 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 175static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu) 176{ 177 return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC; 178} 179 180static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu) 181{ 182 return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE; 183} 184 185static inline unsigned long kvm_vcpu_get_mpidr(struct kvm_vcpu *vcpu) 186{ 187 return vcpu_sys_reg(vcpu, MPIDR_EL1); 188} 189 190static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu) 191{ 192 if (vcpu_mode_is_32bit(vcpu)) 193 *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT; 194 else 195 vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25); 196} 197 198static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu) 199{ 200 if (vcpu_mode_is_32bit(vcpu)) 201 return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT); 202 203 return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25)); 204} 205 206static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu, 207 unsigned long data, 208 unsigned int len) 209{ 210 if (kvm_vcpu_is_be(vcpu)) { 211 switch (len) { 212 case 1: 213 return data & 0xff; 214 case 2: 215 return be16_to_cpu(data & 0xffff); 216 case 4: 217 return be32_to_cpu(data & 0xffffffff); 218 default: 219 return be64_to_cpu(data); 220 } 221 } else { 222 switch (len) { 223 case 1: 224 return data & 0xff; 225 case 2: 226 return le16_to_cpu(data & 0xffff); 227 case 4: 228 return le32_to_cpu(data & 0xffffffff); 229 default: 230 return le64_to_cpu(data); 231 } 232 } 233 234 return data; /* Leave LE untouched */ 235} 236 237static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu, 238 unsigned long data, 239 unsigned int len) 240{ 241 if (kvm_vcpu_is_be(vcpu)) { 242 switch (len) { 243 case 1: 244 return data & 0xff; 245 case 2: 246 return cpu_to_be16(data & 0xffff); 247 case 4: 248 return cpu_to_be32(data & 0xffffffff); 249 default: 250 return cpu_to_be64(data); 251 } 252 } else { 253 switch (len) { 254 case 1: 255 return data & 0xff; 256 case 2: 257 return cpu_to_le16(data & 0xffff); 258 case 4: 259 return cpu_to_le32(data & 0xffffffff); 260 default: 261 return cpu_to_le64(data); 262 } 263 } 264 265 return data; /* Leave LE untouched */ 266} 267 268#endif /* __ARM64_KVM_EMULATE_H__ */ 269