LXR linux/arch/arm64/include/asm/kvm

   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
  27#include <asm/esr.h>
  28#include <asm/kvm_arm.h>
  29#include <asm/kvm_mmio.h>
  30#include <asm/ptrace.h>
  31#include <asm/cputype.h>
  32#include <asm/virt.h>
  33
  34unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
  35unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu);
  36
  37bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
  38void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
  39
  40void kvm_inject_undefined(struct kvm_vcpu *vcpu);
  41void kvm_inject_vabt(struct kvm_vcpu *vcpu);
  42void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
  43void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
  44
  45static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  46{
  47        vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
  48        if (is_kernel_in_hyp_mode())
  49                vcpu->arch.hcr_el2 |= HCR_E2H;
  50        if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features))
  51                vcpu->arch.hcr_el2 &= ~HCR_RW;
  52}
  53
  54static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu)
  55{
  56        return vcpu->arch.hcr_el2;
  57}
  58
  59static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
  60{
  61        vcpu->arch.hcr_el2 = hcr;
  62}
  63
  64static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
  65{
  66        return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pc;
  67}
  68
  69static inline unsigned long *vcpu_elr_el1(const struct kvm_vcpu *vcpu)
  70{
  71        return (unsigned long *)&vcpu_gp_regs(vcpu)->elr_el1;
  72}
  73
  74static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
  75{
  76        return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.pstate;
  77}
  78
  79static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
  80{
  81        return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
  82}
  83
  84static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
  85{
  86        if (vcpu_mode_is_32bit(vcpu))
  87                return kvm_condition_valid32(vcpu);
  88
  89        return true;
  90}
  91
  92static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
  93{
  94        if (vcpu_mode_is_32bit(vcpu))
  95                kvm_skip_instr32(vcpu, is_wide_instr);
  96        else
  97                *vcpu_pc(vcpu) += 4;
  98}
  99
 100static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
 101{
 102        *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
 103}
 104
 105/*
 106 * vcpu_get_reg and vcpu_set_reg should always be passed a register number
 107 * coming from a read of ESR_EL2. Otherwise, it may give the wrong result on
 108 * AArch32 with banked registers.
 109 */
 110static inline unsigned long vcpu_get_reg(const struct kvm_vcpu *vcpu,
 111                                         u8 reg_num)
 112{
 113        return (reg_num == 31) ? 0 : vcpu_gp_regs(vcpu)->regs.regs[reg_num];
 114}
 115
 116static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
 117                                unsigned long val)
 118{
 119        if (reg_num != 31)
 120                vcpu_gp_regs(vcpu)->regs.regs[reg_num] = val;
 121}
 122
 123/* Get vcpu SPSR for current mode */
 124static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
 125{
 126        if (vcpu_mode_is_32bit(vcpu))
 127                return vcpu_spsr32(vcpu);
 128
 129        return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
 130}
 131
 132static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 133{
 134        u32 mode;
 135
 136        if (vcpu_mode_is_32bit(vcpu)) {
 137                mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
 138                return mode > COMPAT_PSR_MODE_USR;
 139        }
 140
 141        mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 142
 143        return mode != PSR_MODE_EL0t;
 144}
 145
 146static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu)
 147{
 148        return vcpu->arch.fault.esr_el2;
 149}
 150
 151static inline int kvm_vcpu_get_condition(const struct kvm_vcpu *vcpu)
 152{
 153        u32 esr = kvm_vcpu_get_hsr(vcpu);
 154
 155        if (esr & ESR_ELx_CV)
 156                return (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
 157
 158        return -1;
 159}
 160
 161static inline unsigned long kvm_vcpu_get_hfar(const struct kvm_vcpu *vcpu)
 162{
 163        return vcpu->arch.fault.far_el2;
 164}
 165
 166static inline phys_addr_t kvm_vcpu_get_fault_ipa(const struct kvm_vcpu *vcpu)
 167{
 168        return ((phys_addr_t)vcpu->arch.fault.hpfar_el2 & HPFAR_MASK) << 8;
 169}
 170
 171static inline u32 kvm_vcpu_hvc_get_imm(const struct kvm_vcpu *vcpu)
 172{
 173        return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_xVC_IMM_MASK;
 174}
 175
 176static inline bool kvm_vcpu_dabt_isvalid(const struct kvm_vcpu *vcpu)
 177{
 178        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_ISV);
 179}
 180
 181static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
 182{
 183        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
 184}
 185
 186static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
 187{
 188        return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;
 189}
 190
 191static inline bool kvm_vcpu_dabt_isextabt(const struct kvm_vcpu *vcpu)
 192{
 193        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_EA);
 194}
 195
 196static inline bool kvm_vcpu_dabt_iss1tw(const struct kvm_vcpu *vcpu)
 197{
 198        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_S1PTW);
 199}
 200
 201static inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 202{
 203        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WNR) ||
 204                kvm_vcpu_dabt_iss1tw(vcpu); /* AF/DBM update */
 205}
 206
 207static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
 208{
 209        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_CM);
 210}
 211
 212static inline int kvm_vcpu_dabt_get_as(const struct kvm_vcpu *vcpu)
 213{
 214        return 1 << ((kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SAS) >> ESR_ELx_SAS_SHIFT);
 215}
 216
 217/* This one is not specific to Data Abort */
 218static inline bool kvm_vcpu_trap_il_is32bit(const struct kvm_vcpu *vcpu)
 219{
 220        return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_IL);
 221}
 222
 223static inline u8 kvm_vcpu_trap_get_class(const struct kvm_vcpu *vcpu)
 224{
 225        return ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
 226}
 227
 228static inline bool kvm_vcpu_trap_is_iabt(const struct kvm_vcpu *vcpu)
 229{
 230        return kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_IABT_LOW;
 231}
 232
 233static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
 234{
 235        return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC;
 236}
 237
 238static inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
 239{
 240        return kvm_vcpu_get_hsr(vcpu) & ESR_ELx_FSC_TYPE;
 241}
 242
 243static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 244{
 245        return vcpu_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;
 246}
 247
 248static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 249{
 250        if (vcpu_mode_is_32bit(vcpu))
 251                *vcpu_cpsr(vcpu) |= COMPAT_PSR_E_BIT;
 252        else
 253                vcpu_sys_reg(vcpu, SCTLR_EL1) |= (1 << 25);
 254}
 255
 256static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 257{
 258        if (vcpu_mode_is_32bit(vcpu))
 259                return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
 260
 261        return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
 262}
 263
 264static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 265                                                    unsigned long data,
 266                                                    unsigned int len)
 267{
 268        if (kvm_vcpu_is_be(vcpu)) {
 269                switch (len) {
 270                case 1:
 271                        return data & 0xff;
 272                case 2:
 273                        return be16_to_cpu(data & 0xffff);
 274                case 4:
 275                        return be32_to_cpu(data & 0xffffffff);
 276                default:
 277                        return be64_to_cpu(data);
 278                }
 279        } else {
 280                switch (len) {
 281                case 1:
 282                        return data & 0xff;
 283                case 2:
 284                        return le16_to_cpu(data & 0xffff);
 285                case 4:
 286                        return le32_to_cpu(data & 0xffffffff);
 287                default:
 288                        return le64_to_cpu(data);
 289                }
 290        }
 291
 292        return data;            /* Leave LE untouched */
 293}
 294
 295static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 296                                                    unsigned long data,
 297                                                    unsigned int len)
 298{
 299        if (kvm_vcpu_is_be(vcpu)) {
 300                switch (len) {
 301                case 1:
 302                        return data & 0xff;
 303                case 2:
 304                        return cpu_to_be16(data & 0xffff);
 305                case 4:
 306                        return cpu_to_be32(data & 0xffffffff);
 307                default:
 308                        return cpu_to_be64(data);
 309                }
 310        } else {
 311                switch (len) {
 312                case 1:
 313                        return data & 0xff;
 314                case 2:
 315                        return cpu_to_le16(data & 0xffff);
 316                case 4:
 317                        return cpu_to_le32(data & 0xffffffff);
 318                default:
 319                        return cpu_to_le64(data);
 320                }
 321        }
 322
 323        return data;            /* Leave LE untouched */
 324}
 325
 326#endif /* __ARM64_KVM_EMULATE_H__ */
 327