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>
13 #define ARM_EXIT_WITH_SERROR_BIT 31
14 #define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
15 #define ARM_EXCEPTION_IS_TRAP(x) (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
16 #define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
18 #define ARM_EXCEPTION_IRQ 0
19 #define ARM_EXCEPTION_EL1_SERROR 1
20 #define ARM_EXCEPTION_TRAP 2
21 #define ARM_EXCEPTION_IL 3
22 /* The hyp-stub will return this for any kvm_call_hyp() call */
23 #define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR
25 #define kvm_arm_exception_type \
26 {ARM_EXCEPTION_IRQ, "IRQ" }, \
27 {ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \
28 {ARM_EXCEPTION_TRAP, "TRAP" }, \
29 {ARM_EXCEPTION_HYP_GONE, "HYP_GONE" }
32 * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
33 * that jumps over this.
35 #define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE)
37 #define KVM_HOST_SMCCC_ID(id) \
38 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
40 ARM_SMCCC_OWNER_VENDOR_HYP, \
43 #define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name)
45 #define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init 0
46 #define __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run 1
47 #define __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context 2
48 #define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa 3
49 #define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid 4
50 #define __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context 5
51 #define __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff 6
52 #define __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs 7
53 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config 8
54 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_read_vmcr 9
55 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_write_vmcr 10
56 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs 11
57 #define __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2 12
58 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs 13
59 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs 14
60 #define __KVM_HOST_SMCCC_FUNC___pkvm_init 15
61 #define __KVM_HOST_SMCCC_FUNC___pkvm_create_mappings 16
62 #define __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping 17
63 #define __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector 18
64 #define __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize 19
65 #define __KVM_HOST_SMCCC_FUNC___pkvm_mark_hyp 20
71 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[]
72 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[]
75 * Define a pair of symbols sharing the same name but one defined in
76 * VHE and the other in nVHE hyp implementations.
78 #define DECLARE_KVM_HYP_SYM(sym) \
79 DECLARE_KVM_VHE_SYM(sym); \
80 DECLARE_KVM_NVHE_SYM(sym)
82 #define DECLARE_KVM_VHE_PER_CPU(type, sym) \
83 DECLARE_PER_CPU(type, sym)
84 #define DECLARE_KVM_NVHE_PER_CPU(type, sym) \
85 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym))
87 #define DECLARE_KVM_HYP_PER_CPU(type, sym) \
88 DECLARE_KVM_VHE_PER_CPU(type, sym); \
89 DECLARE_KVM_NVHE_PER_CPU(type, sym)
92 * Compute pointer to a symbol defined in nVHE percpu region.
93 * Returns NULL if percpu memory has not been allocated yet.
95 #define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id())
96 #define per_cpu_ptr_nvhe_sym(sym, cpu) \
98 unsigned long base, off; \
99 base = kvm_arm_hyp_percpu_base[cpu]; \
100 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \
101 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \
102 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \
105 #if defined(__KVM_NVHE_HYPERVISOR__)
107 #define CHOOSE_NVHE_SYM(sym) sym
108 #define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym)
110 /* The nVHE hypervisor shouldn't even try to access VHE symbols */
111 extern void *__nvhe_undefined_symbol;
112 #define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol
113 #define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol)
114 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol)
116 #elif defined(__KVM_VHE_HYPERVISOR__)
118 #define CHOOSE_VHE_SYM(sym) sym
119 #define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym)
121 /* The VHE hypervisor shouldn't even try to access nVHE symbols */
122 extern void *__vhe_undefined_symbol;
123 #define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol
124 #define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol)
125 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol)
132 * - Don't be tempted to change the following is_kernel_in_hyp_mode()
133 * to has_vhe(). has_vhe() is implemented as a *final* capability,
134 * while this is used early at boot time, when the capabilities are
137 * - Don't let the nVHE hypervisor have access to this, as it will
138 * pick the *wrong* symbol (yes, it runs at EL2...).
140 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \
141 ? CHOOSE_VHE_SYM(sym) \
142 : CHOOSE_NVHE_SYM(sym))
144 #define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \
145 ? this_cpu_ptr(&sym) \
146 : this_cpu_ptr_nvhe_sym(sym))
148 #define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \
149 ? per_cpu_ptr(&sym, cpu) \
150 : per_cpu_ptr_nvhe_sym(sym, cpu))
152 #define CHOOSE_VHE_SYM(sym) sym
153 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
157 struct kvm_nvhe_init_params {
158 unsigned long mair_el2;
159 unsigned long tcr_el2;
160 unsigned long tpidr_el2;
161 unsigned long stack_hyp_va;
163 unsigned long hcr_el2;
168 /* Translate a kernel address @ptr into its equivalent linear mapping */
169 #define kvm_ksym_ref(ptr) \
172 if (!is_kernel_in_hyp_mode()) \
173 val = lm_alias((ptr)); \
176 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym))
182 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
183 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
184 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
185 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
187 extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
188 DECLARE_KVM_NVHE_SYM(__per_cpu_start);
189 DECLARE_KVM_NVHE_SYM(__per_cpu_end);
191 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
192 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
194 extern void __kvm_flush_vm_context(void);
195 extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu);
196 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa,
198 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
200 extern void __kvm_timer_set_cntvoff(u64 cntvoff);
202 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
204 extern u64 __vgic_v3_get_gic_config(void);
205 extern u64 __vgic_v3_read_vmcr(void);
206 extern void __vgic_v3_write_vmcr(u32 vmcr);
207 extern void __vgic_v3_init_lrs(void);
209 extern u32 __kvm_get_mdcr_el2(void);
211 #define __KVM_EXTABLE(from, to) \
212 " .pushsection __kvm_ex_table, \"a\"\n" \
214 " .long (" #from " - .), (" #to " - .)\n" \
218 #define __kvm_at(at_op, addr) \
220 int __kvm_at_err = 0; \
223 " mrs %1, spsr_el2\n" \
224 " mrs %2, elr_el2\n" \
225 "1: at "at_op", %3\n" \
228 "2: msr spsr_el2, %1\n" \
229 " msr elr_el2, %2\n" \
232 __KVM_EXTABLE(1b, 2b) \
233 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \
234 : "r" (addr), "i" (-EFAULT)); \
239 #else /* __ASSEMBLY__ */
241 .macro get_host_ctxt reg, tmp
242 adr_this_cpu \reg, kvm_host_data, \tmp
243 add \reg, \reg, #HOST_DATA_CONTEXT
246 .macro get_vcpu_ptr vcpu, ctxt
247 get_host_ctxt \ctxt, \vcpu
248 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
251 .macro get_loaded_vcpu vcpu, ctxt
252 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu
253 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
256 .macro set_loaded_vcpu vcpu, ctxt, tmp
257 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp
258 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
262 * KVM extable for unexpected exceptions.
263 * In the same format _asm_extable, but output to a different section so that
264 * it can be mapped to EL2. The KVM version is not sorted. The caller must
266 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented
267 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup.
269 .macro _kvm_extable, from, to
270 .pushsection __kvm_ex_table, "a"
272 .long (\from - .), (\to - .)
276 #define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x)
277 #define CPU_LR_OFFSET CPU_XREG_OFFSET(30)
278 #define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8)
281 * We treat x18 as callee-saved as the host may use it as a platform
282 * register (e.g. for shadow call stack).
284 .macro save_callee_saved_regs ctxt
285 str x18, [\ctxt, #CPU_XREG_OFFSET(18)]
286 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
287 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
288 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
289 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
290 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
291 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
294 .macro restore_callee_saved_regs ctxt
295 // We require \ctxt is not x18-x28
296 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)]
297 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
298 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
299 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
300 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
301 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
302 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
305 .macro save_sp_el0 ctxt, tmp
307 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
310 .macro restore_sp_el0 ctxt, tmp
311 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
317 #endif /* __ARM_KVM_ASM_H__ */