Linux v6.18.37 · 원본 파일 · 온라인 원본
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/hyp_image.h>
11#include <asm/insn.h>
12#include <asm/virt.h>
13#include <asm/sysreg.h>
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#define KVM_HOST_SMCCC_ID(id) \
40 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
41 ARM_SMCCC_SMC_64, \
42 ARM_SMCCC_OWNER_VENDOR_HYP, \
43 (id))
44
45#define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name)
46
47#define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init 0
48
49#ifndef __ASSEMBLY__
50
51#include <linux/mm.h>
52
53enum __kvm_host_smccc_func {
54 /* Hypercalls available only prior to pKVM finalisation */
55 /* __KVM_HOST_SMCCC_FUNC___kvm_hyp_init */
56 __KVM_HOST_SMCCC_FUNC___pkvm_init = __KVM_HOST_SMCCC_FUNC___kvm_hyp_init + 1,
57 __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping,
58 __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector,
59 __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs,
60 __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs,
61 __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config,
62 __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize,
63
64 /* Hypercalls available after pKVM finalisation */
65 __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp,
66 __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_hyp,
67 __KVM_HOST_SMCCC_FUNC___pkvm_host_share_guest,
68 __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_guest,
69 __KVM_HOST_SMCCC_FUNC___pkvm_host_relax_perms_guest,
70 __KVM_HOST_SMCCC_FUNC___pkvm_host_wrprotect_guest,
71 __KVM_HOST_SMCCC_FUNC___pkvm_host_test_clear_young_guest,
72 __KVM_HOST_SMCCC_FUNC___pkvm_host_mkyoung_guest,
73 __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc,
74 __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run,
75 __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context,
76 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa,
77 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa_nsh,
78 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid,
79 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_range,
80 __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context,
81 __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff,
82 __KVM_HOST_SMCCC_FUNC___vgic_v3_save_vmcr_aprs,
83 __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_vmcr_aprs,
84 __KVM_HOST_SMCCC_FUNC___pkvm_reserve_vm,
85 __KVM_HOST_SMCCC_FUNC___pkvm_unreserve_vm,
86 __KVM_HOST_SMCCC_FUNC___pkvm_init_vm,
87 __KVM_HOST_SMCCC_FUNC___pkvm_init_vcpu,
88 __KVM_HOST_SMCCC_FUNC___pkvm_teardown_vm,
89 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_load,
90 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_put,
91 __KVM_HOST_SMCCC_FUNC___pkvm_tlb_flush_vmid,
92};
93
94#define DECLARE_KVM_VHE_SYM(sym) extern char sym[]
95#define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[]
96
97/*
98 * Define a pair of symbols sharing the same name but one defined in
99 * VHE and the other in nVHE hyp implementations.
100 */
101#define DECLARE_KVM_HYP_SYM(sym) \
102 DECLARE_KVM_VHE_SYM(sym); \
103 DECLARE_KVM_NVHE_SYM(sym)
104
105#define DECLARE_KVM_VHE_PER_CPU(type, sym) \
106 DECLARE_PER_CPU(type, sym)
107#define DECLARE_KVM_NVHE_PER_CPU(type, sym) \
108 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym))
109
110#define DECLARE_KVM_HYP_PER_CPU(type, sym) \
111 DECLARE_KVM_VHE_PER_CPU(type, sym); \
112 DECLARE_KVM_NVHE_PER_CPU(type, sym)
113
114/*
115 * Compute pointer to a symbol defined in nVHE percpu region.
116 * Returns NULL if percpu memory has not been allocated yet.
117 */
118#define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id())
119#define per_cpu_ptr_nvhe_sym(sym, cpu) \
120 ({ \
121 unsigned long base, off; \
122 base = kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; \
123 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \
124 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \
125 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \
126 })
127
128#if defined(__KVM_NVHE_HYPERVISOR__)
129
130#define CHOOSE_NVHE_SYM(sym) sym
131#define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym)
132
133/* The nVHE hypervisor shouldn't even try to access VHE symbols */
134extern void *__nvhe_undefined_symbol;
135#define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol
136#define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol)
137#define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol)
138
139#elif defined(__KVM_VHE_HYPERVISOR__)
140
141#define CHOOSE_VHE_SYM(sym) sym
142#define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym)
143
144/* The VHE hypervisor shouldn't even try to access nVHE symbols */
145extern void *__vhe_undefined_symbol;
146#define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol
147#define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol)
148#define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol)
149
150#else
151
152/*
153 * BIG FAT WARNINGS:
154 *
155 * - Don't be tempted to change the following is_kernel_in_hyp_mode()
156 * to has_vhe(). has_vhe() is implemented as a *final* capability,
157 * while this is used early at boot time, when the capabilities are
158 * not final yet....
159 *
160 * - Don't let the nVHE hypervisor have access to this, as it will
161 * pick the *wrong* symbol (yes, it runs at EL2...).
162 */
163#define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \
164 ? CHOOSE_VHE_SYM(sym) \
165 : CHOOSE_NVHE_SYM(sym))
166
167#define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \
168 ? this_cpu_ptr(&sym) \
169 : this_cpu_ptr_nvhe_sym(sym))
170
171#define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \
172 ? per_cpu_ptr(&sym, cpu) \
173 : per_cpu_ptr_nvhe_sym(sym, cpu))
174
175#define CHOOSE_VHE_SYM(sym) sym
176#define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym)
177
178#endif
179
180struct kvm_nvhe_init_params {
181 unsigned long mair_el2;
182 unsigned long tcr_el2;
183 unsigned long tpidr_el2;
184 unsigned long stack_hyp_va;
185 unsigned long stack_pa;
186 phys_addr_t pgd_pa;
187 unsigned long hcr_el2;
188 unsigned long vttbr;
189 unsigned long vtcr;
190 unsigned long tmp;
191};
192
193/*
194 * Used by the host in EL1 to dump the nVHE hypervisor backtrace on
195 * hyp_panic() in non-protected mode.
196 *
197 * @stack_base: hyp VA of the hyp_stack base.
198 * @overflow_stack_base: hyp VA of the hyp_overflow_stack base.
199 * @fp: hyp FP where the backtrace begins.
200 * @pc: hyp PC where the backtrace begins.
201 */
202struct kvm_nvhe_stacktrace_info {
203 unsigned long stack_base;
204 unsigned long overflow_stack_base;
205 unsigned long fp;
206 unsigned long pc;
207};
208
209/* Translate a kernel address @ptr into its equivalent linear mapping */
210#define kvm_ksym_ref(ptr) \
211 ({ \
212 void *val = (ptr); \
213 if (!is_kernel_in_hyp_mode()) \
214 val = lm_alias((ptr)); \
215 val; \
216 })
217#define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym))
218
219struct kvm;
220struct kvm_vcpu;
221struct kvm_s2_mmu;
222
223DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
224DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
225#define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
226#define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
227
228extern unsigned long kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[];
229DECLARE_KVM_NVHE_SYM(__per_cpu_start);
230DECLARE_KVM_NVHE_SYM(__per_cpu_end);
231
232DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
233#define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
234
235extern void __kvm_flush_vm_context(void);
236extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu);
237extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa,
238 int level);
239extern void __kvm_tlb_flush_vmid_ipa_nsh(struct kvm_s2_mmu *mmu,
240 phys_addr_t ipa,
241 int level);
242extern void __kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
243 phys_addr_t start, unsigned long pages);
244extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
245
246extern int __kvm_tlbi_s1e2(struct kvm_s2_mmu *mmu, u64 va, u64 sys_encoding);
247
248extern void __kvm_timer_set_cntvoff(u64 cntvoff);
249extern void __kvm_at_s1e01(struct kvm_vcpu *vcpu, u32 op, u64 vaddr);
250extern void __kvm_at_s1e2(struct kvm_vcpu *vcpu, u32 op, u64 vaddr);
251extern void __kvm_at_s12(struct kvm_vcpu *vcpu, u32 op, u64 vaddr);
252
253extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
254
255extern void __kvm_adjust_pc(struct kvm_vcpu *vcpu);
256
257extern u64 __vgic_v3_get_gic_config(void);
258extern void __vgic_v3_init_lrs(void);
259
260#define __KVM_EXTABLE(from, to) \
261 " .pushsection __kvm_ex_table, \"a\"\n" \
262 " .align 3\n" \
263 " .long (" #from " - .), (" #to " - .)\n" \
264 " .popsection\n"
265
266
267#define __kvm_at(at_op, addr) \
268( { \
269 int __kvm_at_err = 0; \
270 u64 spsr, elr; \
271 asm volatile( \
272 " mrs %1, spsr_el2\n" \
273 " mrs %2, elr_el2\n" \
274 "1: " __msr_s(at_op, "%3") "\n" \
275 " isb\n" \
276 " b 9f\n" \
277 "2: msr spsr_el2, %1\n" \
278 " msr elr_el2, %2\n" \
279 " mov %w0, %4\n" \
280 "9:\n" \
281 __KVM_EXTABLE(1b, 2b) \
282 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \
283 : "r" (addr), "i" (-EFAULT)); \
284 __kvm_at_err; \
285} )
286
287void __noreturn hyp_panic(void);
288asmlinkage void kvm_unexpected_el2_exception(void);
289asmlinkage void __noreturn hyp_panic(void);
290asmlinkage void __noreturn hyp_panic_bad_stack(void);
291asmlinkage void kvm_unexpected_el2_exception(void);
292struct kvm_cpu_context;
293void handle_trap(struct kvm_cpu_context *host_ctxt);
294asmlinkage void __noreturn __kvm_host_psci_cpu_entry(bool is_cpu_on);
295void __noreturn __pkvm_init_finalise(void);
296void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc);
297void kvm_patch_vector_branch(struct alt_instr *alt,
298 __le32 *origptr, __le32 *updptr, int nr_inst);
299void kvm_get_kimage_voffset(struct alt_instr *alt,
300 __le32 *origptr, __le32 *updptr, int nr_inst);
301void kvm_compute_final_ctr_el0(struct alt_instr *alt,
302 __le32 *origptr, __le32 *updptr, int nr_inst);
303void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr, u64 elr_virt,
304 u64 elr_phys, u64 par, uintptr_t vcpu, u64 far, u64 hpfar);
305
306#else /* __ASSEMBLY__ */
307
308.macro get_host_ctxt reg, tmp
309 adr_this_cpu \reg, kvm_host_data, \tmp
310 add \reg, \reg, #HOST_DATA_CONTEXT
311.endm
312
313.macro get_vcpu_ptr vcpu, ctxt
314 get_host_ctxt \ctxt, \vcpu
315 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
316.endm
317
318.macro get_loaded_vcpu vcpu, ctxt
319 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu
320 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
321.endm
322
323.macro set_loaded_vcpu vcpu, ctxt, tmp
324 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp
325 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
326.endm
327
328/*
329 * KVM extable for unexpected exceptions.
330 * Create a struct kvm_exception_table_entry output to a section that can be
331 * mapped by EL2. The table is not sorted.
332 *
333 * The caller must ensure:
334 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented
335 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup.
336 */
337.macro _kvm_extable, from, to
338 .pushsection __kvm_ex_table, "a"
339 .align 3
340 .long (\from - .), (\to - .)
341 .popsection
342.endm
343
344#define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x)
345#define CPU_LR_OFFSET CPU_XREG_OFFSET(30)
346#define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8)
347
348/*
349 * We treat x18 as callee-saved as the host may use it as a platform
350 * register (e.g. for shadow call stack).
351 */
352.macro save_callee_saved_regs ctxt
353 str x18, [\ctxt, #CPU_XREG_OFFSET(18)]
354 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
355 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
356 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
357 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
358 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
359 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
360.endm
361
362.macro restore_callee_saved_regs ctxt
363 // We require \ctxt is not x18-x28
364 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)]
365 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
366 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
367 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
368 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
369 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
370 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)]
371.endm
372
373.macro save_sp_el0 ctxt, tmp
374 mrs \tmp, sp_el0
375 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
376.endm
377
378.macro restore_sp_el0 ctxt, tmp
379 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET]
380 msr sp_el0, \tmp
381.endm
382
383#endif
384
385#endif /* __ARM_KVM_ASM_H__ */