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 #define __SMCCC_WORKAROUND_1_SMC_SZ 36 40 41 #ifndef __ASSEMBLY__ 42 43 #include <linux/mm.h> 44 45 /* Translate a kernel address of @sym into its equivalent linear mapping */ 46 #define kvm_ksym_ref(sym) \ 47 ({ \ 48 void *val = &sym; \ 49 if (!is_kernel_in_hyp_mode()) \ 50 val = lm_alias(&sym); \ 51 val; \ 52 }) 53 54 struct kvm; 55 struct kvm_vcpu; 56 57 extern char __kvm_hyp_init[]; 58 extern char __kvm_hyp_init_end[]; 59 60 extern char __kvm_hyp_vector[]; 61 62 extern void __kvm_flush_vm_context(void); 63 extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); 64 extern void __kvm_tlb_flush_vmid(struct kvm *kvm); 65 extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu); 66 67 extern void __kvm_timer_set_cntvoff(u64 cntvoff); 68 69 extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu); 70 71 extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu); 72 73 extern void __kvm_enable_ssbs(void); 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 extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ]; 83 84 /* 85 * Obtain the PC-relative address of a kernel symbol 86 * s: symbol 87 * 88 * The goal of this macro is to return a symbol's address based on a 89 * PC-relative computation, as opposed to a loading the VA from a 90 * constant pool or something similar. This works well for HYP, as an 91 * absolute VA is guaranteed to be wrong. Only use this if trying to 92 * obtain the address of a symbol (i.e. not something you obtained by 93 * following a pointer). 94 */ 95 #define hyp_symbol_addr(s) \ 96 ({ \ 97 typeof(s) *addr; \ 98 asm("adrp %0, %1\n" \ 99 "add %0, %0, :lo12:%1\n" \ 100 : "=r" (addr) : "S" (&s)); \ 101 addr; \ 102 }) 103 104 /* 105 * Home-grown __this_cpu_{ptr,read} variants that always work at HYP, 106 * provided that sym is really a *symbol* and not a pointer obtained from 107 * a data structure. As for SHIFT_PERCPU_PTR(), the creative casting keeps 108 * sparse quiet. 109 */ 110 #define __hyp_this_cpu_ptr(sym) \ 111 ({ \ 112 void *__ptr; \ 113 __verify_pcpu_ptr(&sym); \ 114 __ptr = hyp_symbol_addr(sym); \ 115 __ptr += read_sysreg(tpidr_el2); \ 116 (typeof(sym) __kernel __force *)__ptr; \ 117 }) 118 119 #define __hyp_this_cpu_read(sym) \ 120 ({ \ 121 *__hyp_this_cpu_ptr(sym); \ 122 }) 123 124 #else /* __ASSEMBLY__ */ 125 126 .macro hyp_adr_this_cpu reg, sym, tmp 127 adr_l \reg, \sym 128 mrs \tmp, tpidr_el2 129 add \reg, \reg, \tmp 130 .endm 131 132 .macro hyp_ldr_this_cpu reg, sym, tmp 133 adr_l \reg, \sym 134 mrs \tmp, tpidr_el2 135 ldr \reg, [\reg, \tmp] 136 .endm 137 138 .macro get_host_ctxt reg, tmp 139 hyp_adr_this_cpu \reg, kvm_host_data, \tmp 140 add \reg, \reg, #HOST_DATA_CONTEXT 141 .endm 142 143 .macro get_vcpu_ptr vcpu, ctxt 144 get_host_ctxt \ctxt, \vcpu 145 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 146 kern_hyp_va \vcpu 147 .endm 148 149 #endif 150 151 #endif /* __ARM_KVM_ASM_H__ */ 152