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 = __va_function(sym); \ 47 if (!is_kernel_in_hyp_mode()) \ 48 val = lm_alias(val); \ 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_flush_cpu_context(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 #define __KVM_EXTABLE(from, to) \ 92 " .pushsection __kvm_ex_table, \"a\"\n" \ 93 " .align 3\n" \ 94 " .long (" #from " - .), (" #to " - .)\n" \ 95 " .popsection\n" 96 97 98 #define __kvm_at(at_op, addr) \ 99 ( { \ 100 int __kvm_at_err = 0; \ 101 u64 spsr, elr; \ 102 asm volatile( \ 103 " mrs %1, spsr_el2\n" \ 104 " mrs %2, elr_el2\n" \ 105 "1: at "at_op", %3\n" \ 106 " isb\n" \ 107 " b 9f\n" \ 108 "2: msr spsr_el2, %1\n" \ 109 " msr elr_el2, %2\n" \ 110 " mov %w0, %4\n" \ 111 "9:\n" \ 112 __KVM_EXTABLE(1b, 2b) \ 113 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ 114 : "r" (addr), "i" (-EFAULT)); \ 115 __kvm_at_err; \ 116 } ) 117 118 119 #else /* __ASSEMBLY__ */ 120 121 .macro hyp_adr_this_cpu reg, sym, tmp 122 adr_l \reg, \sym 123 mrs \tmp, tpidr_el2 124 add \reg, \reg, \tmp 125 .endm 126 127 .macro hyp_ldr_this_cpu reg, sym, tmp 128 adr_l \reg, \sym 129 mrs \tmp, tpidr_el2 130 ldr \reg, [\reg, \tmp] 131 .endm 132 133 .macro get_host_ctxt reg, tmp 134 hyp_adr_this_cpu \reg, kvm_host_data, \tmp 135 add \reg, \reg, #HOST_DATA_CONTEXT 136 .endm 137 138 .macro get_vcpu_ptr vcpu, ctxt 139 get_host_ctxt \ctxt, \vcpu 140 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 141 kern_hyp_va \vcpu 142 .endm 143 144 /* 145 * KVM extable for unexpected exceptions. 146 * In the same format _asm_extable, but output to a different section so that 147 * it can be mapped to EL2. The KVM version is not sorted. The caller must 148 * ensure: 149 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented 150 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. 151 */ 152 .macro _kvm_extable, from, to 153 .pushsection __kvm_ex_table, "a" 154 .align 3 155 .long (\from - .), (\to - .) 156 .popsection 157 .endm 158 159 #endif 160 161 #endif /* __ARM_KVM_ASM_H__ */ 162