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Linux/arch/arm64/include/asm/kvm_asm.h

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  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__ */
123 

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