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 53 enum __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___kvm_get_mdcr_el2 = __KVM_HOST_SMCCC_FUNC___kvm_hyp_init + 1, 57 __KVM_HOST_SMCCC_FUNC___pkvm_init, 58 __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping, 59 __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector, 60 __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs, 61 __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs, 62 __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config, 63 __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize, 64 65 /* Hypercalls available after pKVM finalisation */ 66 __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp, 67 __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_hyp, 68 __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc, 69 __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run, 70 __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context, 71 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa, 72 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa_nsh, 73 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid, 74 __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_range, 75 __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context, 76 __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff, 77 __KVM_HOST_SMCCC_FUNC___vgic_v3_save_vmcr_aprs, 78 __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_vmcr_aprs, 79 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_init_traps, 80 __KVM_HOST_SMCCC_FUNC___pkvm_init_vm, 81 __KVM_HOST_SMCCC_FUNC___pkvm_init_vcpu, 82 __KVM_HOST_SMCCC_FUNC___pkvm_teardown_vm, 83 }; 84 85 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] 86 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[] 87 88 /* 89 * Define a pair of symbols sharing the same name but one defined in 90 * VHE and the other in nVHE hyp implementations. 91 */ 92 #define DECLARE_KVM_HYP_SYM(sym) \ 93 DECLARE_KVM_VHE_SYM(sym); \ 94 DECLARE_KVM_NVHE_SYM(sym) 95 96 #define DECLARE_KVM_VHE_PER_CPU(type, sym) \ 97 DECLARE_PER_CPU(type, sym) 98 #define DECLARE_KVM_NVHE_PER_CPU(type, sym) \ 99 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym)) 100 101 #define DECLARE_KVM_HYP_PER_CPU(type, sym) \ 102 DECLARE_KVM_VHE_PER_CPU(type, sym); \ 103 DECLARE_KVM_NVHE_PER_CPU(type, sym) 104 105 /* 106 * Compute pointer to a symbol defined in nVHE percpu region. 107 * Returns NULL if percpu memory has not been allocated yet. 108 */ 109 #define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id()) 110 #define per_cpu_ptr_nvhe_sym(sym, cpu) \ 111 ({ \ 112 unsigned long base, off; \ 113 base = kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; \ 114 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ 115 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ 116 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ 117 }) 118 119 #if defined(__KVM_NVHE_HYPERVISOR__) 120 121 #define CHOOSE_NVHE_SYM(sym) sym 122 #define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym) 123 124 /* The nVHE hypervisor shouldn't even try to access VHE symbols */ 125 extern void *__nvhe_undefined_symbol; 126 #define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol 127 #define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol) 128 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol) 129 130 #elif defined(__KVM_VHE_HYPERVISOR__) 131 132 #define CHOOSE_VHE_SYM(sym) sym 133 #define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym) 134 135 /* The VHE hypervisor shouldn't even try to access nVHE symbols */ 136 extern void *__vhe_undefined_symbol; 137 #define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol 138 #define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol) 139 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol) 140 141 #else 142 143 /* 144 * BIG FAT WARNINGS: 145 * 146 * - Don't be tempted to change the following is_kernel_in_hyp_mode() 147 * to has_vhe(). has_vhe() is implemented as a *final* capability, 148 * while this is used early at boot time, when the capabilities are 149 * not final yet.... 150 * 151 * - Don't let the nVHE hypervisor have access to this, as it will 152 * pick the *wrong* symbol (yes, it runs at EL2...). 153 */ 154 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \ 155 ? CHOOSE_VHE_SYM(sym) \ 156 : CHOOSE_NVHE_SYM(sym)) 157 158 #define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \ 159 ? this_cpu_ptr(&sym) \ 160 : this_cpu_ptr_nvhe_sym(sym)) 161 162 #define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \ 163 ? per_cpu_ptr(&sym, cpu) \ 164 : per_cpu_ptr_nvhe_sym(sym, cpu)) 165 166 #define CHOOSE_VHE_SYM(sym) sym 167 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) 168 169 #endif 170 171 struct kvm_nvhe_init_params { 172 unsigned long mair_el2; 173 unsigned long tcr_el2; 174 unsigned long tpidr_el2; 175 unsigned long stack_hyp_va; 176 unsigned long stack_pa; 177 phys_addr_t pgd_pa; 178 unsigned long hcr_el2; 179 unsigned long vttbr; 180 unsigned long vtcr; 181 }; 182 183 /* 184 * Used by the host in EL1 to dump the nVHE hypervisor backtrace on 185 * hyp_panic() in non-protected mode. 186 * 187 * @stack_base: hyp VA of the hyp_stack base. 188 * @overflow_stack_base: hyp VA of the hyp_overflow_stack base. 189 * @fp: hyp FP where the backtrace begins. 190 * @pc: hyp PC where the backtrace begins. 191 */ 192 struct kvm_nvhe_stacktrace_info { 193 unsigned long stack_base; 194 unsigned long overflow_stack_base; 195 unsigned long fp; 196 unsigned long pc; 197 }; 198 199 /* Translate a kernel address @ptr into its equivalent linear mapping */ 200 #define kvm_ksym_ref(ptr) \ 201 ({ \ 202 void *val = (ptr); \ 203 if (!is_kernel_in_hyp_mode()) \ 204 val = lm_alias((ptr)); \ 205 val; \ 206 }) 207 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym)) 208 209 struct kvm; 210 struct kvm_vcpu; 211 struct kvm_s2_mmu; 212 213 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init); 214 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); 215 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) 216 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) 217 218 extern unsigned long kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[]; 219 DECLARE_KVM_NVHE_SYM(__per_cpu_start); 220 DECLARE_KVM_NVHE_SYM(__per_cpu_end); 221 222 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); 223 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs) 224 225 extern void __kvm_flush_vm_context(void); 226 extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu); 227 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa, 228 int level); 229 extern void __kvm_tlb_flush_vmid_ipa_nsh(struct kvm_s2_mmu *mmu, 230 phys_addr_t ipa, 231 int level); 232 extern void __kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu, 233 phys_addr_t start, unsigned long pages); 234 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu); 235 236 extern int __kvm_tlbi_s1e2(struct kvm_s2_mmu *mmu, u64 va, u64 sys_encoding); 237 238 extern void __kvm_timer_set_cntvoff(u64 cntvoff); 239 240 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); 241 242 extern void __kvm_adjust_pc(struct kvm_vcpu *vcpu); 243 244 extern u64 __vgic_v3_get_gic_config(void); 245 extern void __vgic_v3_init_lrs(void); 246 247 extern u64 __kvm_get_mdcr_el2(void); 248 249 #define __KVM_EXTABLE(from, to) \ 250 " .pushsection __kvm_ex_table, \"a\"\n" \ 251 " .align 3\n" \ 252 " .long (" #from " - .), (" #to " - .)\n" \ 253 " .popsection\n" 254 255 256 #define __kvm_at(at_op, addr) \ 257 ( { \ 258 int __kvm_at_err = 0; \ 259 u64 spsr, elr; \ 260 asm volatile( \ 261 " mrs %1, spsr_el2\n" \ 262 " mrs %2, elr_el2\n" \ 263 "1: " __msr_s(at_op, "%3") "\n" \ 264 " isb\n" \ 265 " b 9f\n" \ 266 "2: msr spsr_el2, %1\n" \ 267 " msr elr_el2, %2\n" \ 268 " mov %w0, %4\n" \ 269 "9:\n" \ 270 __KVM_EXTABLE(1b, 2b) \ 271 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ 272 : "r" (addr), "i" (-EFAULT)); \ 273 __kvm_at_err; \ 274 } ) 275 276 void __noreturn hyp_panic(void); 277 asmlinkage void kvm_unexpected_el2_exception(void); 278 asmlinkage void __noreturn hyp_panic(void); 279 asmlinkage void __noreturn hyp_panic_bad_stack(void); 280 asmlinkage void kvm_unexpected_el2_exception(void); 281 struct kvm_cpu_context; 282 void handle_trap(struct kvm_cpu_context *host_ctxt); 283 asmlinkage void __noreturn __kvm_host_psci_cpu_entry(bool is_cpu_on); 284 void __noreturn __pkvm_init_finalise(void); 285 void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc); 286 void kvm_patch_vector_branch(struct alt_instr *alt, 287 __le32 *origptr, __le32 *updptr, int nr_inst); 288 void kvm_get_kimage_voffset(struct alt_instr *alt, 289 __le32 *origptr, __le32 *updptr, int nr_inst); 290 void kvm_compute_final_ctr_el0(struct alt_instr *alt, 291 __le32 *origptr, __le32 *updptr, int nr_inst); 292 void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr, u64 elr_virt, 293 u64 elr_phys, u64 par, uintptr_t vcpu, u64 far, u64 hpfar); 294 295 #else /* __ASSEMBLY__ */ 296 297 .macro get_host_ctxt reg, tmp 298 adr_this_cpu \reg, kvm_host_data, \tmp 299 add \reg, \reg, #HOST_DATA_CONTEXT 300 .endm 301 302 .macro get_vcpu_ptr vcpu, ctxt 303 get_host_ctxt \ctxt, \vcpu 304 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 305 .endm 306 307 .macro get_loaded_vcpu vcpu, ctxt 308 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu 309 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 310 .endm 311 312 .macro set_loaded_vcpu vcpu, ctxt, tmp 313 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp 314 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 315 .endm 316 317 /* 318 * KVM extable for unexpected exceptions. 319 * Create a struct kvm_exception_table_entry output to a section that can be 320 * mapped by EL2. The table is not sorted. 321 * 322 * The caller must ensure: 323 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented 324 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. 325 */ 326 .macro _kvm_extable, from, to 327 .pushsection __kvm_ex_table, "a" 328 .align 3 329 .long (\from - .), (\to - .) 330 .popsection 331 .endm 332 333 #define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x) 334 #define CPU_LR_OFFSET CPU_XREG_OFFSET(30) 335 #define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8) 336 337 /* 338 * We treat x18 as callee-saved as the host may use it as a platform 339 * register (e.g. for shadow call stack). 340 */ 341 .macro save_callee_saved_regs ctxt 342 str x18, [\ctxt, #CPU_XREG_OFFSET(18)] 343 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 344 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 345 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 346 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 347 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 348 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 349 .endm 350 351 .macro restore_callee_saved_regs ctxt 352 // We require \ctxt is not x18-x28 353 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)] 354 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 355 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 356 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 357 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 358 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 359 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 360 .endm 361 362 .macro save_sp_el0 ctxt, tmp 363 mrs \tmp, sp_el0 364 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 365 .endm 366 367 .macro restore_sp_el0 ctxt, tmp 368 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 369 msr sp_el0, \tmp 370 .endm 371 372 #endif 373 374 #endif /* __ARM_KVM_ASM_H__ */ 375