arch/arm64/include/asm/kvm_asm.h

   1 /*
   2  * Copyright (C) 2012,2013 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef __ARM_KVM_ASM_H__
  19 #define __ARM_KVM_ASM_H__
  20
  21 #include <asm/virt.h>
  22
  23 #define VCPU_WORKAROUND_2_FLAG_SHIFT    0
  24 #define VCPU_WORKAROUND_2_FLAG          (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
  25
  26 #define ARM_EXIT_WITH_SERROR_BIT  31
  27 #define ARM_EXCEPTION_CODE(x)     ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
  28 #define ARM_SERROR_PENDING(x)     !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
  29
  30 #define ARM_EXCEPTION_IRQ         0
  31 #define ARM_EXCEPTION_EL1_SERROR  1
  32 #define ARM_EXCEPTION_TRAP        2
  33 #define ARM_EXCEPTION_IL          3
  34 /* The hyp-stub will return this for any kvm_call_hyp() call */
  35 #define ARM_EXCEPTION_HYP_GONE    HVC_STUB_ERR
  36
  37 #define kvm_arm_exception_type                                  \
  38         {ARM_EXCEPTION_IRQ,             "IRQ"           },      \
  39         {ARM_EXCEPTION_EL1_SERROR,      "SERROR"        },      \
  40         {ARM_EXCEPTION_TRAP,            "TRAP"          },      \
  41         {ARM_EXCEPTION_HYP_GONE,        "HYP_GONE"      }
  42
  43 #ifndef __ASSEMBLY__
  44
  45 #include <linux/mm.h>
  46
  47 /* Translate a kernel address of @sym into its equivalent linear mapping */
  48 #define kvm_ksym_ref(sym)                                               \
  49         ({                                                              \
  50                 void *val = &sym;                                       \
  51                 if (!is_kernel_in_hyp_mode())                           \
  52                         val = lm_alias(&sym);                           \
  53                 val;                                                    \
  54          })
  55
  56 struct kvm;
  57 struct kvm_vcpu;
  58
  59 extern char __kvm_hyp_init[];
  60 extern char __kvm_hyp_init_end[];
  61
  62 extern char __kvm_hyp_vector[];
  63
  64 extern void __kvm_flush_vm_context(void);
  65 extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
  66 extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
  67 extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
  68
  69 extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
  70
  71 extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
  72
  73 extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
  74
  75 extern u64 __vgic_v3_get_ich_vtr_el2(void);
  76 extern u64 __vgic_v3_read_vmcr(void);
  77 extern void __vgic_v3_write_vmcr(u32 vmcr);
  78 extern void __vgic_v3_init_lrs(void);
  79
  80 extern u32 __kvm_get_mdcr_el2(void);
  81
  82 /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
  83 #define __hyp_this_cpu_ptr(sym)                                         \
  84         ({                                                              \
  85                 void *__ptr = hyp_symbol_addr(sym);                     \
  86                 __ptr += read_sysreg(tpidr_el2);                        \
  87                 (typeof(&sym))__ptr;                                    \
  88          })
  89
  90 #define __hyp_this_cpu_read(sym)                                        \
  91         ({                                                              \
  92                 *__hyp_this_cpu_ptr(sym);                               \
  93          })
  94
  95 #else /* __ASSEMBLY__ */
  96
  97 .macro hyp_adr_this_cpu reg, sym, tmp
  98         adr_l   \reg, \sym
  99         mrs     \tmp, tpidr_el2
 100         add     \reg, \reg, \tmp
 101 .endm
 102
 103 .macro hyp_ldr_this_cpu reg, sym, tmp
 104         adr_l   \reg, \sym
 105         mrs     \tmp, tpidr_el2
 106         ldr     \reg,  [\reg, \tmp]
 107 .endm
 108
 109 .macro get_host_ctxt reg, tmp
 110         hyp_adr_this_cpu \reg, kvm_host_cpu_state, \tmp
 111 .endm
 112
 113 .macro get_vcpu_ptr vcpu, ctxt
 114         get_host_ctxt \ctxt, \vcpu
 115         ldr     \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
 116         kern_hyp_va     \vcpu
 117 .endm
 118
 119 #endif
 120
 121 #endif /* __ARM_KVM_ASM_H__ */