arch/arm/include/asm/kvm_emulate.h

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #ifndef __ARM_KVM_EMULATE_H__
  20 #define __ARM_KVM_EMULATE_H__
  21
  22 #include <linux/kvm_host.h>
  23 #include <asm/kvm_asm.h>
  24 #include <asm/kvm_mmio.h>
  25 #include <asm/kvm_arm.h>
  26 #include <asm/cputype.h>
  27
  28 unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
  29 unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
  30
  31 static inline unsigned long vcpu_get_reg(struct kvm_vcpu *vcpu,
  32                                          u8 reg_num)
  33 {
  34         return *vcpu_reg(vcpu, reg_num);
  35 }
  36
  37 static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
  38                                 unsigned long val)
  39 {
  40         *vcpu_reg(vcpu, reg_num) = val;
  41 }
  42
  43 bool kvm_condition_valid(struct kvm_vcpu *vcpu);
  44 void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr);
  45 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
  46 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
  47 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
  48
  49 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  50 {
  51         vcpu->arch.hcr = HCR_GUEST_MASK;
  52 }
  53
  54 static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu)
  55 {
  56         return vcpu->arch.hcr;
  57 }
  58
  59 static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
  60 {
  61         vcpu->arch.hcr = hcr;
  62 }
  63
  64 static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
  65 {
  66         return 1;
  67 }
  68
  69 static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
  70 {
  71         return &vcpu->arch.regs.usr_regs.ARM_pc;
  72 }
  73
  74 static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
  75 {
  76         return &vcpu->arch.regs.usr_regs.ARM_cpsr;
  77 }
  78
  79 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
  80 {
  81         *vcpu_cpsr(vcpu) |= PSR_T_BIT;
  82 }
  83
  84 static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
  85 {
  86         unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
  87         return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
  88 }
  89
  90 static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
  91 {
  92         unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
  93         return cpsr_mode > USR_MODE;;
  94 }
  95
  96 static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
  97 {
  98         return vcpu->arch.fault.hsr;
  99 }
 100
 101 static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
 102 {
 103         return vcpu->arch.fault.hxfar;
 104 }
 105
 106 static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
 107 {
 108         return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
 109 }
 110
 111 static inline unsigned long kvm_vcpu_get_hyp_pc(struct kvm_vcpu *vcpu)
 112 {
 113         return vcpu->arch.fault.hyp_pc;
 114 }
 115
 116 static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
 117 {
 118         return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
 119 }
 120
 121 static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
 122 {
 123         return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
 124 }
 125
 126 static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
 127 {
 128         return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
 129 }
 130
 131 static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
 132 {
 133         return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
 134 }
 135
 136 static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
 137 {
 138         return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
 139 }
 140
 141 static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
 142 {
 143         return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
 144 }
 145
 146 /* Get Access Size from a data abort */
 147 static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
 148 {
 149         switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
 150         case 0:
 151                 return 1;
 152         case 1:
 153                 return 2;
 154         case 2:
 155                 return 4;
 156         default:
 157                 kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
 158                 return -EFAULT;
 159         }
 160 }
 161
 162 /* This one is not specific to Data Abort */
 163 static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
 164 {
 165         return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
 166 }
 167
 168 static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
 169 {
 170         return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
 171 }
 172
 173 static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
 174 {
 175         return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
 176 }
 177
 178 static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
 179 {
 180         return kvm_vcpu_get_hsr(vcpu) & HSR_FSC;
 181 }
 182
 183 static inline u8 kvm_vcpu_trap_get_fault_type(struct kvm_vcpu *vcpu)
 184 {
 185         return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
 186 }
 187
 188 static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
 189 {
 190         return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
 191 }
 192
 193 static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
 194 {
 195         return vcpu->arch.cp15[c0_MPIDR] & MPIDR_HWID_BITMASK;
 196 }
 197
 198 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 199 {
 200         *vcpu_cpsr(vcpu) |= PSR_E_BIT;
 201 }
 202
 203 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 204 {
 205         return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
 206 }
 207
 208 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 209                                                     unsigned long data,
 210                                                     unsigned int len)
 211 {
 212         if (kvm_vcpu_is_be(vcpu)) {
 213                 switch (len) {
 214                 case 1:
 215                         return data & 0xff;
 216                 case 2:
 217                         return be16_to_cpu(data & 0xffff);
 218                 default:
 219                         return be32_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                 default:
 228                         return le32_to_cpu(data);
 229                 }
 230         }
 231 }
 232
 233 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 234                                                     unsigned long data,
 235                                                     unsigned int len)
 236 {
 237         if (kvm_vcpu_is_be(vcpu)) {
 238                 switch (len) {
 239                 case 1:
 240                         return data & 0xff;
 241                 case 2:
 242                         return cpu_to_be16(data & 0xffff);
 243                 default:
 244                         return cpu_to_be32(data);
 245                 }
 246         } else {
 247                 switch (len) {
 248                 case 1:
 249                         return data & 0xff;
 250                 case 2:
 251                         return cpu_to_le16(data & 0xffff);
 252                 default:
 253                         return cpu_to_le32(data);
 254                 }
 255         }
 256 }
 257
 258 #endif /* __ARM_KVM_EMULATE_H__ */