1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012,2013 - ARM Ltd
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
7 #ifndef __ARM_KVM_ASM_H__
8 #define __ARM_KVM_ASM_H__
12 #define VCPU_WORKAROUND_2_FLAG_SHIFT 0
13 #define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
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))
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
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" }
34 * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
35 * that jumps over this.
37 #define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE)
43 /* Translate a kernel address of @sym into its equivalent linear mapping */
44 #define kvm_ksym_ref(sym) \
47 if (!is_kernel_in_hyp_mode()) \
48 val = lm_alias(&sym); \
55 extern char __kvm_hyp_init[];
56 extern char __kvm_hyp_init_end[];
58 extern char __kvm_hyp_vector[];
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);
65 extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
67 extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
69 extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
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);
76 extern u32 __kvm_get_mdcr_el2(void);
78 /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
79 #define __hyp_this_cpu_ptr(sym) \
81 void *__ptr = hyp_symbol_addr(sym); \
82 __ptr += read_sysreg(tpidr_el2); \
83 (typeof(&sym))__ptr; \
86 #define __hyp_this_cpu_read(sym) \
88 *__hyp_this_cpu_ptr(sym); \
91 #define __KVM_EXTABLE(from, to) \
92 " .pushsection __kvm_ex_table, \"a\"\n" \
94 " .long (" #from " - .), (" #to " - .)\n" \
98 #define __kvm_at(at_op, addr) \
100 int __kvm_at_err = 0; \
103 " mrs %1, spsr_el2\n" \
104 " mrs %2, elr_el2\n" \
105 "1: at "at_op", %3\n" \
108 "2: msr spsr_el2, %1\n" \
109 " msr elr_el2, %2\n" \
112 __KVM_EXTABLE(1b, 2b) \
113 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \
114 : "r" (addr), "i" (-EFAULT)); \
119 #else /* __ASSEMBLY__ */
121 .macro hyp_adr_this_cpu reg, sym, tmp
127 .macro hyp_ldr_this_cpu reg, sym, tmp
130 ldr \reg, [\reg, \tmp]
133 .macro get_host_ctxt reg, tmp
134 hyp_adr_this_cpu \reg, kvm_host_data, \tmp
135 add \reg, \reg, #HOST_DATA_CONTEXT
138 .macro get_vcpu_ptr vcpu, ctxt
139 get_host_ctxt \ctxt, \vcpu
140 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
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
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.
152 .macro _kvm_extable, from, to
153 .pushsection __kvm_ex_table, "a"
155 .long (\from - .), (\to - .)
161 #endif /* __ARM_KVM_ASM_H__ */