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