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
  27 unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
  28 unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
  29
  30 bool kvm_condition_valid(struct kvm_vcpu *vcpu);
  31 void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr);
  32 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
  33 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
  34 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
  35
  36 static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
  37 {
  38         vcpu->arch.hcr = HCR_GUEST_MASK;
  39 }
  40
  41 static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
  42 {
  43         return 1;
  44 }
  45
  46 static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
  47 {
  48         return &vcpu->arch.regs.usr_regs.ARM_pc;
  49 }
  50
  51 static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
  52 {
  53         return &vcpu->arch.regs.usr_regs.ARM_cpsr;
  54 }
  55
  56 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
  57 {
  58         *vcpu_cpsr(vcpu) |= PSR_T_BIT;
  59 }
  60
  61 static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
  62 {
  63         unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
  64         return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
  65 }
  66
  67 static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
  68 {
  69         unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
  70         return cpsr_mode > USR_MODE;;
  71 }
  72
  73 static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
  74 {
  75         return vcpu->arch.fault.hsr;
  76 }
  77
  78 static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
  79 {
  80         return vcpu->arch.fault.hxfar;
  81 }
  82
  83 static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
  84 {
  85         return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
  86 }
  87
  88 static inline unsigned long kvm_vcpu_get_hyp_pc(struct kvm_vcpu *vcpu)
  89 {
  90         return vcpu->arch.fault.hyp_pc;
  91 }
  92
  93 static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
  94 {
  95         return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
  96 }
  97
  98 static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
  99 {
 100         return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
 101 }
 102
 103 static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
 104 {
 105         return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
 106 }
 107
 108 static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
 109 {
 110         return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
 111 }
 112
 113 static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
 114 {
 115         return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
 116 }
 117
 118 static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
 119 {
 120         return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
 121 }
 122
 123 /* Get Access Size from a data abort */
 124 static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
 125 {
 126         switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
 127         case 0:
 128                 return 1;
 129         case 1:
 130                 return 2;
 131         case 2:
 132                 return 4;
 133         default:
 134                 kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
 135                 return -EFAULT;
 136         }
 137 }
 138
 139 /* This one is not specific to Data Abort */
 140 static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
 141 {
 142         return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
 143 }
 144
 145 static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
 146 {
 147         return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
 148 }
 149
 150 static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
 151 {
 152         return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
 153 }
 154
 155 static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
 156 {
 157         return kvm_vcpu_get_hsr(vcpu) & HSR_FSC;
 158 }
 159
 160 static inline u8 kvm_vcpu_trap_get_fault_type(struct kvm_vcpu *vcpu)
 161 {
 162         return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
 163 }
 164
 165 static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
 166 {
 167         return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
 168 }
 169
 170 static inline unsigned long kvm_vcpu_get_mpidr(struct kvm_vcpu *vcpu)
 171 {
 172         return vcpu->arch.cp15[c0_MPIDR];
 173 }
 174
 175 static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
 176 {
 177         *vcpu_cpsr(vcpu) |= PSR_E_BIT;
 178 }
 179
 180 static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
 181 {
 182         return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
 183 }
 184
 185 static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
 186                                                     unsigned long data,
 187                                                     unsigned int len)
 188 {
 189         if (kvm_vcpu_is_be(vcpu)) {
 190                 switch (len) {
 191                 case 1:
 192                         return data & 0xff;
 193                 case 2:
 194                         return be16_to_cpu(data & 0xffff);
 195                 default:
 196                         return be32_to_cpu(data);
 197                 }
 198         } else {
 199                 switch (len) {
 200                 case 1:
 201                         return data & 0xff;
 202                 case 2:
 203                         return le16_to_cpu(data & 0xffff);
 204                 default:
 205                         return le32_to_cpu(data);
 206                 }
 207         }
 208 }
 209
 210 static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
 211                                                     unsigned long data,
 212                                                     unsigned int len)
 213 {
 214         if (kvm_vcpu_is_be(vcpu)) {
 215                 switch (len) {
 216                 case 1:
 217                         return data & 0xff;
 218                 case 2:
 219                         return cpu_to_be16(data & 0xffff);
 220                 default:
 221                         return cpu_to_be32(data);
 222                 }
 223         } else {
 224                 switch (len) {
 225                 case 1:
 226                         return data & 0xff;
 227                 case 2:
 228                         return cpu_to_le16(data & 0xffff);
 229                 default:
 230                         return cpu_to_le32(data);
 231                 }
 232         }
 233 }
 234
 235 #endif /* __ARM_KVM_EMULATE_H__ */