arch/arm64/include/asm/kvm_emulate.h

   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         }
 217
 218         return data;            /* Leave LE untouched */
 219 }
 220
 221 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 222                                                     unsigned long data,
 223                                                     unsigned int len)
 224 {
 225         if (kvm_vcpu_is_be(vcpu)) {
 226                 switch (len) {
 227                 case 1:
 228                         return data & 0xff;
 229                 case 2:
 230                         return cpu_to_be16(data & 0xffff);
 231                 case 4:
 232                         return cpu_to_be32(data & 0xffffffff);
 233                 default:
 234                         return cpu_to_be64(data);
 235                 }
 236         }
 237
 238         return data;            /* Leave LE untouched */
 239 }
 240
 241 #endif /* __ARM64_KVM_EMULATE_H__ */