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)
39 #define __SMCCC_WORKAROUND_1_SMC_SZ 36
46 * Translate name of a symbol defined in nVHE hyp to the name seen
47 * by kernel proper. All nVHE symbols are prefixed by the build system
48 * to avoid clashes with the VHE variants.
50 #define kvm_nvhe_sym(sym) __kvm_nvhe_##sym
52 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[]
53 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[]
56 * Define a pair of symbols sharing the same name but one defined in
57 * VHE and the other in nVHE hyp implementations.
59 #define DECLARE_KVM_HYP_SYM(sym) \
60 DECLARE_KVM_VHE_SYM(sym); \
61 DECLARE_KVM_NVHE_SYM(sym)
63 #define CHOOSE_VHE_SYM(sym) sym
64 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
66 #ifndef __KVM_NVHE_HYPERVISOR__
70 * - Don't be tempted to change the following is_kernel_in_hyp_mode()
71 * to has_vhe(). has_vhe() is implemented as a *final* capability,
72 * while this is used early at boot time, when the capabilities are
75 * - Don't let the nVHE hypervisor have access to this, as it will
76 * pick the *wrong* symbol (yes, it runs at EL2...).
78 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() ? CHOOSE_VHE_SYM(sym) \
79 : CHOOSE_NVHE_SYM(sym))
81 /* The nVHE hypervisor shouldn't even try to access anything */
82 extern void *__nvhe_undefined_symbol;
83 #define CHOOSE_HYP_SYM(sym) __nvhe_undefined_symbol
86 /* Translate a kernel address @ptr into its equivalent linear mapping */
87 #define kvm_ksym_ref(ptr) \
90 if (!is_kernel_in_hyp_mode()) \
91 val = lm_alias((ptr)); \
94 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym))
100 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
101 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
102 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
103 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
105 #ifdef CONFIG_KVM_INDIRECT_VECTORS
106 extern atomic_t arm64_el2_vector_last_slot;
107 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
108 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
111 extern void __kvm_flush_vm_context(void);
112 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa,
114 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
115 extern void __kvm_tlb_flush_local_vmid(struct kvm_s2_mmu *mmu);
117 extern void __kvm_timer_set_cntvoff(u64 cntvoff);
119 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
121 extern void __kvm_enable_ssbs(void);
123 extern u64 __vgic_v3_get_ich_vtr_el2(void);
124 extern u64 __vgic_v3_read_vmcr(void);
125 extern void __vgic_v3_write_vmcr(u32 vmcr);
126 extern void __vgic_v3_init_lrs(void);
128 extern u32 __kvm_get_mdcr_el2(void);
130 extern char __smccc_workaround_1_smc[__SMCCC_WORKAROUND_1_SMC_SZ];
133 * Obtain the PC-relative address of a kernel symbol
136 * The goal of this macro is to return a symbol's address based on a
137 * PC-relative computation, as opposed to a loading the VA from a
138 * constant pool or something similar. This works well for HYP, as an
139 * absolute VA is guaranteed to be wrong. Only use this if trying to
140 * obtain the address of a symbol (i.e. not something you obtained by
141 * following a pointer).
143 #define hyp_symbol_addr(s) \
146 asm("adrp %0, %1\n" \
147 "add %0, %0, :lo12:%1\n" \
148 : "=r" (addr) : "S" (&s)); \
153 * Home-grown __this_cpu_{ptr,read} variants that always work at HYP,
154 * provided that sym is really a *symbol* and not a pointer obtained from
155 * a data structure. As for SHIFT_PERCPU_PTR(), the creative casting keeps
158 #define __hyp_this_cpu_ptr(sym) \
161 __verify_pcpu_ptr(&sym); \
162 __ptr = hyp_symbol_addr(sym); \
163 __ptr += read_sysreg(tpidr_el2); \
164 (typeof(sym) __kernel __force *)__ptr; \
167 #define __hyp_this_cpu_read(sym) \
169 *__hyp_this_cpu_ptr(sym); \
172 #define __KVM_EXTABLE(from, to) \
173 " .pushsection __kvm_ex_table, \"a\"\n" \
175 " .long (" #from " - .), (" #to " - .)\n" \
179 #define __kvm_at(at_op, addr) \
181 int __kvm_at_err = 0; \
184 " mrs %1, spsr_el2\n" \
185 " mrs %2, elr_el2\n" \
186 "1: at "at_op", %3\n" \
189 "2: msr spsr_el2, %1\n" \
190 " msr elr_el2, %2\n" \
193 __KVM_EXTABLE(1b, 2b) \
194 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \
195 : "r" (addr), "i" (-EFAULT)); \
200 #else /* __ASSEMBLY__ */
202 .macro hyp_adr_this_cpu reg, sym, tmp
208 .macro hyp_ldr_this_cpu reg, sym, tmp
211 ldr \reg, [\reg, \tmp]
214 .macro get_host_ctxt reg, tmp
215 hyp_adr_this_cpu \reg, kvm_host_data, \tmp
216 add \reg, \reg, #HOST_DATA_CONTEXT
219 .macro get_vcpu_ptr vcpu, ctxt
220 get_host_ctxt \ctxt, \vcpu
221 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
225 * KVM extable for unexpected exceptions.
226 * In the same format _asm_extable, but output to a different section so that
227 * it can be mapped to EL2. The KVM version is not sorted. The caller must
229 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented
230 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup.
232 .macro _kvm_extable, from, to
233 .pushsection __kvm_ex_table, "a"
235 .long (\from - .), (\to - .)
241 #endif /* __ARM_KVM_ASM_H__ */