arch/arm64/include/asm/kvm_asm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012,2013 - ARM Ltd
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  */
   6
   7 #ifndef __ARM_KVM_ASM_H__
   8 #define __ARM_KVM_ASM_H__
   9
  10 #include <asm/virt.h>
  11
  12 #define VCPU_WORKAROUND_2_FLAG_SHIFT    0
  13 #define VCPU_WORKAROUND_2_FLAG          (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
  14
  15 #define ARM_EXIT_WITH_SERROR_BIT  31
  16 #define ARM_EXCEPTION_CODE(x)     ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
  17 #define ARM_EXCEPTION_IS_TRAP(x)  (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
  18 #define ARM_SERROR_PENDING(x)     !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
  19
  20 #define ARM_EXCEPTION_IRQ         0
  21 #define ARM_EXCEPTION_EL1_SERROR  1
  22 #define ARM_EXCEPTION_TRAP        2
  23 #define ARM_EXCEPTION_IL          3
  24 /* The hyp-stub will return this for any kvm_call_hyp() call */
  25 #define ARM_EXCEPTION_HYP_GONE    HVC_STUB_ERR
  26
  27 #define kvm_arm_exception_type                                  \
  28         {ARM_EXCEPTION_IRQ,             "IRQ"           },      \
  29         {ARM_EXCEPTION_EL1_SERROR,      "SERROR"        },      \
  30         {ARM_EXCEPTION_TRAP,            "TRAP"          },      \
  31         {ARM_EXCEPTION_HYP_GONE,        "HYP_GONE"      }
  32
  33 /*
  34  * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
  35  * that jumps over this.
  36  */
  37 #define KVM_VECTOR_PREAMBLE     (2 * AARCH64_INSN_SIZE)
  38
  39 #ifndef __ASSEMBLY__
  40
  41 #include <linux/mm.h>
  42
  43 /* Translate a kernel address of @sym into its equivalent linear mapping */
  44 #define kvm_ksym_ref(sym)                                               \
  45         ({                                                              \
  46                 void *val = &sym;                                       \
  47                 if (!is_kernel_in_hyp_mode())                           \
  48                         val = lm_alias(&sym);                           \
  49                 val;                                                    \
  50          })
  51
  52 struct kvm;
  53 struct kvm_vcpu;
  54
  55 extern char __kvm_hyp_init[];
  56 extern char __kvm_hyp_init_end[];
  57
  58 extern char __kvm_hyp_vector[];
  59
  60 extern void __kvm_flush_vm_context(void);
  61 extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
  62 extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
  63 extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
  64
  65 extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
  66
  67 extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
  68
  69 extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
  70
  71 extern u64 __vgic_v3_get_ich_vtr_el2(void);
  72 extern u64 __vgic_v3_read_vmcr(void);
  73 extern void __vgic_v3_write_vmcr(u32 vmcr);
  74 extern void __vgic_v3_init_lrs(void);
  75
  76 extern u32 __kvm_get_mdcr_el2(void);
  77
  78 /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
  79 #define __hyp_this_cpu_ptr(sym)                                         \
  80         ({                                                              \
  81                 void *__ptr = hyp_symbol_addr(sym);                     \
  82                 __ptr += read_sysreg(tpidr_el2);                        \
  83                 (typeof(&sym))__ptr;                                    \
  84          })
  85
  86 #define __hyp_this_cpu_read(sym)                                        \
  87         ({                                                              \
  88                 *__hyp_this_cpu_ptr(sym);                               \
  89          })
  90
  91 #else /* __ASSEMBLY__ */
  92
  93 .macro hyp_adr_this_cpu reg, sym, tmp
  94         adr_l   \reg, \sym
  95         mrs     \tmp, tpidr_el2
  96         add     \reg, \reg, \tmp
  97 .endm
  98
  99 .macro hyp_ldr_this_cpu reg, sym, tmp
 100         adr_l   \reg, \sym
 101         mrs     \tmp, tpidr_el2
 102         ldr     \reg,  [\reg, \tmp]
 103 .endm
 104
 105 .macro get_host_ctxt reg, tmp
 106         hyp_adr_this_cpu \reg, kvm_host_data, \tmp
 107         add     \reg, \reg, #HOST_DATA_CONTEXT
 108 .endm
 109
 110 .macro get_vcpu_ptr vcpu, ctxt
 111         get_host_ctxt \ctxt, \vcpu
 112         ldr     \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
 113         kern_hyp_va     \vcpu
 114 .endm
 115
 116 #endif
 117
 118 #endif /* __ARM_KVM_ASM_H__ */