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 __ASSEMBLER__ 50 51 #include <linux/mm.h> 52 53 #define MARKER(m) \ 54 m, __after_##m = m - 1 55 56 enum __kvm_host_smccc_func { 57 /* Hypercalls that are unavailable once pKVM has finalised. */ 58 /* __KVM_HOST_SMCCC_FUNC___kvm_hyp_init */ 59 __KVM_HOST_SMCCC_FUNC___pkvm_init = __KVM_HOST_SMCCC_FUNC___kvm_hyp_init + 1, 60 __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping, 61 __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector, 62 __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs, 63 __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs, 64 __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config, 65 __KVM_HOST_SMCCC_FUNC___pkvm_hyp_alloc_selftest, 66 67 MARKER(__KVM_HOST_SMCCC_FUNC_MIN_PKVM), 68 69 __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize, 70 71 /* Hypercalls that are always available and common to [nh]VHE/pKVM. */ 72 __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc, 73 __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run, 74 __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context, 75 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa, 76 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa_nsh, 77 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid, 78 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_range, 79 __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context, 80 __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff, 81 __KVM_HOST_SMCCC_FUNC___tracing_load, 82 __KVM_HOST_SMCCC_FUNC___tracing_unload, 83 __KVM_HOST_SMCCC_FUNC___tracing_enable, 84 __KVM_HOST_SMCCC_FUNC___tracing_swap_reader, 85 __KVM_HOST_SMCCC_FUNC___tracing_update_clock, 86 __KVM_HOST_SMCCC_FUNC___tracing_reset, 87 __KVM_HOST_SMCCC_FUNC___tracing_enable_event, 88 __KVM_HOST_SMCCC_FUNC___tracing_write_event, 89 __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs, 90 __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_vmcr_aprs, 91 __KVM_HOST_SMCCC_FUNC___vgic_v5_make_resident, 92 __KVM_HOST_SMCCC_FUNC___vgic_v5_make_non_resident, 93 __KVM_HOST_SMCCC_FUNC___vgic_v5_vdpend, 94 __KVM_HOST_SMCCC_FUNC___vgic_v5_save_apr, 95 __KVM_HOST_SMCCC_FUNC___vgic_v5_restore_vmcr_apr, 96 __KVM_HOST_SMCCC_FUNC___pkvm_hyp_topup, 97 __KVM_HOST_SMCCC_FUNC___pkvm_hyp_reclaim, 98 __KVM_HOST_SMCCC_FUNC___pkvm_hyp_reclaimable, 99 __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp, 100 __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_hyp, 101 102 MARKER(__KVM_HOST_SMCCC_FUNC_PKVM_ONLY), 103 104 /* Hypercalls that are available only when pKVM has finalised. */ 105 __KVM_HOST_SMCCC_FUNC___pkvm_host_donate_guest, 106 __KVM_HOST_SMCCC_FUNC___pkvm_host_share_guest, 107 __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_guest, 108 __KVM_HOST_SMCCC_FUNC___pkvm_host_relax_perms_guest, 109 __KVM_HOST_SMCCC_FUNC___pkvm_host_wrprotect_guest, 110 __KVM_HOST_SMCCC_FUNC___pkvm_host_test_clear_young_guest, 111 __KVM_HOST_SMCCC_FUNC___pkvm_host_mkyoung_guest, 112 __KVM_HOST_SMCCC_FUNC___pkvm_reserve_vm, 113 __KVM_HOST_SMCCC_FUNC___pkvm_unreserve_vm, 114 __KVM_HOST_SMCCC_FUNC___pkvm_init_vm, 115 __KVM_HOST_SMCCC_FUNC___pkvm_init_vcpu, 116 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_in_poison_fault, 117 __KVM_HOST_SMCCC_FUNC___pkvm_force_reclaim_guest_page, 118 __KVM_HOST_SMCCC_FUNC___pkvm_reclaim_dying_guest_page, 119 __KVM_HOST_SMCCC_FUNC___pkvm_start_teardown_vm, 120 __KVM_HOST_SMCCC_FUNC___pkvm_finalize_teardown_vm, 121 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_load, 122 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_put, 123 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_sync_state, 124 __KVM_HOST_SMCCC_FUNC___pkvm_tlb_flush_vmid, 125 126 MARKER(__KVM_HOST_SMCCC_FUNC_MAX) 127 }; 128 129 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] 130 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[] 131 132 /* 133 * Define a pair of symbols sharing the same name but one defined in 134 * VHE and the other in nVHE hyp implementations. 135 */ 136 #define DECLARE_KVM_HYP_SYM(sym) \ 137 DECLARE_KVM_VHE_SYM(sym); \ 138 DECLARE_KVM_NVHE_SYM(sym) 139 140 #define DECLARE_KVM_VHE_PER_CPU(type, sym) \ 141 DECLARE_PER_CPU(type, sym) 142 #define DECLARE_KVM_NVHE_PER_CPU(type, sym) \ 143 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym)) 144 145 #define DECLARE_KVM_HYP_PER_CPU(type, sym) \ 146 DECLARE_KVM_VHE_PER_CPU(type, sym); \ 147 DECLARE_KVM_NVHE_PER_CPU(type, sym) 148 149 /* 150 * Compute pointer to a symbol defined in nVHE percpu region. 151 * Returns NULL if percpu memory has not been allocated yet. 152 */ 153 #define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id()) 154 #define per_cpu_ptr_nvhe_sym(sym, cpu) \ 155 ({ \ 156 unsigned long base, off; \ 157 base = kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; \ 158 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ 159 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ 160 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ 161 }) 162 163 #if defined(__KVM_NVHE_HYPERVISOR__) 164 165 #define CHOOSE_NVHE_SYM(sym) sym 166 #define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym) 167 168 /* The nVHE hypervisor shouldn't even try to access VHE symbols */ 169 extern void *__nvhe_undefined_symbol; 170 #define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol 171 #define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol) 172 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol) 173 174 #elif defined(__KVM_VHE_HYPERVISOR__) 175 176 #define CHOOSE_VHE_SYM(sym) sym 177 #define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym) 178 179 /* The VHE hypervisor shouldn't even try to access nVHE symbols */ 180 extern void *__vhe_undefined_symbol; 181 #define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol 182 #define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol) 183 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol) 184 185 #else 186 187 /* 188 * BIG FAT WARNINGS: 189 * 190 * - Don't be tempted to change the following is_kernel_in_hyp_mode() 191 * to has_vhe(). has_vhe() is implemented as a *final* capability, 192 * while this is used early at boot time, when the capabilities are 193 * not final yet.... 194 * 195 * - Don't let the nVHE hypervisor have access to this, as it will 196 * pick the *wrong* symbol (yes, it runs at EL2...). 197 */ 198 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \ 199 ? CHOOSE_VHE_SYM(sym) \ 200 : CHOOSE_NVHE_SYM(sym)) 201 202 #define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \ 203 ? this_cpu_ptr(&sym) \ 204 : this_cpu_ptr_nvhe_sym(sym)) 205 206 #define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \ 207 ? per_cpu_ptr(&sym, cpu) \ 208 : per_cpu_ptr_nvhe_sym(sym, cpu)) 209 210 #define CHOOSE_VHE_SYM(sym) sym 211 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) 212 213 #endif 214 215 struct kvm_nvhe_init_params { 216 unsigned long mair_el2; 217 unsigned long tcr_el2; 218 unsigned long tpidr_el2; 219 unsigned long stack_hyp_va; 220 unsigned long stack_pa; 221 phys_addr_t pgd_pa; 222 unsigned long hcr_el2; 223 unsigned long vttbr; 224 unsigned long vtcr; 225 }; 226 227 /* 228 * Used by the host in EL1 to dump the nVHE hypervisor backtrace on 229 * hyp_panic() in non-protected mode. 230 * 231 * @stack_base: hyp VA of the hyp_stack base. 232 * @overflow_stack_base: hyp VA of the hyp_overflow_stack base. 233 * @fp: hyp FP where the backtrace begins. 234 * @pc: hyp PC where the backtrace begins. 235 */ 236 struct kvm_nvhe_stacktrace_info { 237 unsigned long stack_base; 238 unsigned long overflow_stack_base; 239 unsigned long fp; 240 unsigned long pc; 241 }; 242 243 /* Translate a kernel address @ptr into its equivalent linear mapping */ 244 #define kvm_ksym_ref(ptr) \ 245 ({ \ 246 void *val = (ptr); \ 247 if (!is_kernel_in_hyp_mode()) \ 248 val = lm_alias((ptr)); \ 249 val; \ 250 }) 251 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym)) 252 253 struct kvm; 254 struct kvm_vcpu; 255 struct kvm_s2_mmu; 256 257 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init); 258 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); 259 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) 260 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) 261 262 extern unsigned long kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[]; 263 DECLARE_KVM_NVHE_SYM(__per_cpu_start); 264 DECLARE_KVM_NVHE_SYM(__per_cpu_end); 265 266 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); 267 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs) 268 269 extern void __kvm_flush_vm_context(void); 270 extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu); 271 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa, 272 int level); 273 extern void __kvm_tlb_flush_vmid_ipa_nsh(struct kvm_s2_mmu *mmu, 274 phys_addr_t ipa, 275 int level); 276 extern void __kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu, 277 phys_addr_t start, unsigned long pages); 278 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu); 279 280 extern int __kvm_tlbi_s1e2(struct kvm_s2_mmu *mmu, u64 va, u64 sys_encoding); 281 282 extern void __kvm_timer_set_cntvoff(u64 cntvoff); 283 extern int __kvm_at_s1e01(struct kvm_vcpu *vcpu, u32 op, u64 vaddr); 284 extern int __kvm_at_s1e2(struct kvm_vcpu *vcpu, u32 op, u64 vaddr); 285 extern int __kvm_at_s12(struct kvm_vcpu *vcpu, u32 op, u64 vaddr); 286 287 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); 288 289 extern void __kvm_adjust_pc(struct kvm_vcpu *vcpu); 290 291 extern bool __vgic_v3_get_gic_config(void); 292 extern void __vgic_v3_init_lrs(void); 293 294 #define __KVM_EXTABLE(from, to) \ 295 " .pushsection __kvm_ex_table, \"a\"\n" \ 296 " .align 3\n" \ 297 " .long (" #from " - .), (" #to " - .)\n" \ 298 " .popsection\n" 299 300 301 #define __kvm_at(at_op, addr) \ 302 ( { \ 303 int __kvm_at_err = 0; \ 304 u64 spsr, elr; \ 305 asm volatile( \ 306 " mrs %1, spsr_el2\n" \ 307 " mrs %2, elr_el2\n" \ 308 "1: " __msr_s(at_op, "%3") "\n" \ 309 " isb\n" \ 310 " b 9f\n" \ 311 "2: msr spsr_el2, %1\n" \ 312 " msr elr_el2, %2\n" \ 313 " mov %w0, %4\n" \ 314 "9:\n" \ 315 __KVM_EXTABLE(1b, 2b) \ 316 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ 317 : "r" (addr), "i" (-EFAULT)); \ 318 __kvm_at_err; \ 319 } ) 320 321 void __noreturn hyp_panic(void); 322 asmlinkage void kvm_unexpected_el2_exception(void); 323 asmlinkage void __noreturn hyp_panic(void); 324 asmlinkage void __noreturn hyp_panic_bad_stack(void); 325 asmlinkage void kvm_unexpected_el2_exception(void); 326 struct kvm_cpu_context; 327 void handle_trap(struct kvm_cpu_context *host_ctxt); 328 asmlinkage void __noreturn __kvm_host_psci_cpu_on_entry(void); 329 asmlinkage void __noreturn __kvm_host_psci_cpu_resume_entry(void); 330 void __noreturn __pkvm_init_finalise(void); 331 void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc); 332 void kvm_patch_vector_branch(struct alt_instr *alt, 333 __le32 *origptr, __le32 *updptr, int nr_inst); 334 void kvm_get_kimage_voffset(struct alt_instr *alt, 335 __le32 *origptr, __le32 *updptr, int nr_inst); 336 void kvm_compute_final_ctr_el0(struct alt_instr *alt, 337 __le32 *origptr, __le32 *updptr, int nr_inst); 338 void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr, u64 elr_virt, 339 u64 elr_phys, u64 par, uintptr_t vcpu, u64 far, u64 hpfar); 340 341 #else /* __ASSEMBLER__ */ 342 343 .macro get_host_ctxt reg, tmp 344 adr_this_cpu \reg, kvm_host_data, \tmp 345 add \reg, \reg, #HOST_DATA_CONTEXT 346 .endm 347 348 .macro get_vcpu_ptr vcpu, ctxt 349 get_host_ctxt \ctxt, \vcpu 350 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 351 .endm 352 353 .macro get_loaded_vcpu vcpu, ctxt 354 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu 355 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 356 .endm 357 358 .macro set_loaded_vcpu vcpu, ctxt, tmp 359 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp 360 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 361 .endm 362 363 /* 364 * KVM extable for unexpected exceptions. 365 * Create a struct kvm_exception_table_entry output to a section that can be 366 * mapped by EL2. The table is not sorted. 367 * 368 * The caller must ensure: 369 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented 370 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. 371 */ 372 .macro _kvm_extable, from, to 373 .pushsection __kvm_ex_table, "a" 374 .align 3 375 .long (\from - .), (\to - .) 376 .popsection 377 .endm 378 379 #define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x) 380 #define CPU_LR_OFFSET CPU_XREG_OFFSET(30) 381 #define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8) 382 383 /* 384 * We treat x18 as callee-saved as the host may use it as a platform 385 * register (e.g. for shadow call stack). 386 */ 387 .macro save_callee_saved_regs ctxt 388 str x18, [\ctxt, #CPU_XREG_OFFSET(18)] 389 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 390 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 391 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 392 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 393 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 394 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 395 .endm 396 397 .macro restore_callee_saved_regs ctxt 398 // We require \ctxt is not x18-x28 399 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)] 400 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 401 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 402 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 403 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 404 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 405 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 406 .endm 407 408 .macro save_sp_el0 ctxt, tmp 409 mrs \tmp, sp_el0 410 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 411 .endm 412 413 .macro restore_sp_el0 ctxt, tmp 414 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 415 msr sp_el0, \tmp 416 .endm 417 418 #endif 419 420 #endif /* __ARM_KVM_ASM_H__ */ 421