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__
10 #include <asm/hyp_image.h>
14 #define ARM_EXIT_WITH_SERROR_BIT 31
15 #define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
16 #define ARM_EXCEPTION_IS_TRAP(x) (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
17 #define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
19 #define ARM_EXCEPTION_IRQ 0
20 #define ARM_EXCEPTION_EL1_SERROR 1
21 #define ARM_EXCEPTION_TRAP 2
22 #define ARM_EXCEPTION_IL 3
23 /* The hyp-stub will return this for any kvm_call_hyp() call */
24 #define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR
26 #define kvm_arm_exception_type \
27 {ARM_EXCEPTION_IRQ, "IRQ" }, \
28 {ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \
29 {ARM_EXCEPTION_TRAP, "TRAP" }, \
30 {ARM_EXCEPTION_HYP_GONE, "HYP_GONE" }
33 * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
34 * that jumps over this.
36 #define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE)
38 #define KVM_HOST_SMCCC_ID(id) \
39 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
41 ARM_SMCCC_OWNER_VENDOR_HYP, \
44 #define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name)
46 #define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init 0
47 #define __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run 1
48 #define __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context 2
49 #define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa 3
50 #define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid 4
51 #define __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context 5
52 #define __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff 6
53 #define __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs 7
54 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config 8
55 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_read_vmcr 9
56 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_write_vmcr 10
57 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs 11
58 #define __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2 12
59 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs 13
60 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs 14
61 #define __KVM_HOST_SMCCC_FUNC___pkvm_init 15
62 #define __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp 16
63 #define __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping 17
64 #define __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector 18
65 #define __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize 19
66 #define __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc 20
72 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[]
73 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[]
76 * Define a pair of symbols sharing the same name but one defined in
77 * VHE and the other in nVHE hyp implementations.
79 #define DECLARE_KVM_HYP_SYM(sym) \
80 DECLARE_KVM_VHE_SYM(sym); \
81 DECLARE_KVM_NVHE_SYM(sym)
83 #define DECLARE_KVM_VHE_PER_CPU(type, sym) \
84 DECLARE_PER_CPU(type, sym)
85 #define DECLARE_KVM_NVHE_PER_CPU(type, sym) \
86 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym))
88 #define DECLARE_KVM_HYP_PER_CPU(type, sym) \
89 DECLARE_KVM_VHE_PER_CPU(type, sym); \
90 DECLARE_KVM_NVHE_PER_CPU(type, sym)
93 * Compute pointer to a symbol defined in nVHE percpu region.
94 * Returns NULL if percpu memory has not been allocated yet.
96 #define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id())
97 #define per_cpu_ptr_nvhe_sym(sym, cpu) \
99 unsigned long base, off; \
100 base = kvm_arm_hyp_percpu_base[cpu]; \
101 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \
102 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \
103 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \
106 #if defined(__KVM_NVHE_HYPERVISOR__)
108 #define CHOOSE_NVHE_SYM(sym) sym
109 #define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym)
111 /* The nVHE hypervisor shouldn't even try to access VHE symbols */
112 extern void *__nvhe_undefined_symbol;
113 #define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol
114 #define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol)
115 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol)
117 #elif defined(__KVM_VHE_HYPERVISOR__)
119 #define CHOOSE_VHE_SYM(sym) sym
120 #define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym)
122 /* The VHE hypervisor shouldn't even try to access nVHE symbols */
123 extern void *__vhe_undefined_symbol;
124 #define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol
125 #define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol)
126 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol)
133 * - Don't be tempted to change the following is_kernel_in_hyp_mode()
134 * to has_vhe(). has_vhe() is implemented as a *final* capability,
135 * while this is used early at boot time, when the capabilities are
138 * - Don't let the nVHE hypervisor have access to this, as it will
139 * pick the *wrong* symbol (yes, it runs at EL2...).
141 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \
142 ? CHOOSE_VHE_SYM(sym) \
143 : CHOOSE_NVHE_SYM(sym))
145 #define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \
146 ? this_cpu_ptr(&sym) \
147 : this_cpu_ptr_nvhe_sym(sym))
149 #define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \
150 ? per_cpu_ptr(&sym, cpu) \
151 : per_cpu_ptr_nvhe_sym(sym, cpu))
153 #define CHOOSE_VHE_SYM(sym) sym
154 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
158 struct kvm_nvhe_init_params {
159 unsigned long mair_el2;
160 unsigned long tcr_el2;
161 unsigned long tpidr_el2;
162 unsigned long stack_hyp_va;
164 unsigned long hcr_el2;
169 /* Translate a kernel address @ptr into its equivalent linear mapping */
170 #define kvm_ksym_ref(ptr) \
173 if (!is_kernel_in_hyp_mode()) \
174 val = lm_alias((ptr)); \
177 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym))
183 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
184 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
185 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
186 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
188 extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
189 DECLARE_KVM_NVHE_SYM(__per_cpu_start);
190 DECLARE_KVM_NVHE_SYM(__per_cpu_end);
192 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
193 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
195 extern void __kvm_flush_vm_context(void);
196 extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu);
197 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa,
199 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
201 extern void __kvm_timer_set_cntvoff(u64 cntvoff);
203 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
205 extern void __kvm_adjust_pc(struct kvm_vcpu *vcpu);
207 extern u64 __vgic_v3_get_gic_config(void);
208 extern u64 __vgic_v3_read_vmcr(void);
209 extern void __vgic_v3_write_vmcr(u32 vmcr);
210 extern void __vgic_v3_init_lrs(void);
212 extern u32 __kvm_get_mdcr_el2(void);
214 #define __KVM_EXTABLE(from, to) \
215 " .pushsection __kvm_ex_table, \"a\"\n" \
217 " .long (" #from " - .), (" #to " - .)\n" \
221 #define __kvm_at(at_op, addr) \
223 int __kvm_at_err = 0; \
226 " mrs %1, spsr_el2\n" \
227 " mrs %2, elr_el2\n" \
228 "1: at "at_op", %3\n" \
231 "2: msr spsr_el2, %1\n" \
232 " msr elr_el2, %2\n" \
235 __KVM_EXTABLE(1b, 2b) \
236 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \
237 : "r" (addr), "i" (-EFAULT)); \
242 #else /* __ASSEMBLY__ */
244 .macro get_host_ctxt reg, tmp
245 adr_this_cpu \reg, kvm_host_data, \tmp
246 add \reg, \reg, #HOST_DATA_CONTEXT
249 .macro get_vcpu_ptr vcpu, ctxt
250 get_host_ctxt \ctxt, \vcpu
251 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
254 .macro get_loaded_vcpu vcpu, ctxt
255 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu
256 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
259 .macro set_loaded_vcpu vcpu, ctxt, tmp
260 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp
261 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
265 * KVM extable for unexpected exceptions.
266 * In the same format _asm_extable, but output to a different section so that
267 * it can be mapped to EL2. The KVM version is not sorted. The caller must
269 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented
270 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup.
272 .macro _kvm_extable, from, to
273 .pushsection __kvm_ex_table, "a"
275 .long (\from - .), (\to - .)
279 #define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x)
280 #define CPU_LR_OFFSET CPU_XREG_OFFSET(30)
281 #define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8)
284 * We treat x18 as callee-saved as the host may use it as a platform
285 * register (e.g. for shadow call stack).
287 .macro save_callee_saved_regs ctxt
288 str x18, [\ctxt, #CPU_XREG_OFFSET(18)]
289 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
290 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
291 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
292 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
293 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
294 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
297 .macro restore_callee_saved_regs ctxt
298 // We require \ctxt is not x18-x28
299 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)]
300 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
301 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
302 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
303 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
304 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
305 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
308 .macro save_sp_el0 ctxt, tmp
310 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
313 .macro restore_sp_el0 ctxt, tmp
314 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
320 #endif /* __ARM_KVM_ASM_H__ */