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 int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run);
  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 bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
  37 {
  38         return 1;
  39 }
  40
  41 static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
  42 {
  43         return &vcpu->arch.regs.usr_regs.ARM_pc;
  44 }
  45
  46 static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
  47 {
  48         return &vcpu->arch.regs.usr_regs.ARM_cpsr;
  49 }
  50
  51 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
  52 {
  53         *vcpu_cpsr(vcpu) |= PSR_T_BIT;
  54 }
  55
  56 static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
  57 {
  58         unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
  59         return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
  60 }
  61
  62 static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
  63 {
  64         unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
  65         return cpsr_mode > USR_MODE;;
  66 }
  67
  68 static inline bool kvm_vcpu_reg_is_pc(struct kvm_vcpu *vcpu, int reg)
  69 {
  70         return reg == 15;
  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 #endif /* __ARM_KVM_EMULATE_H__ */