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/virt.h> 12 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)) 17 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 24 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" } 30 31 /* 32 * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code 33 * that jumps over this. 34 */ 35 #define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE) 36 37 #define KVM_HOST_SMCCC_ID(id) \ 38 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 39 ARM_SMCCC_SMC_64, \ 40 ARM_SMCCC_OWNER_VENDOR_HYP, \ 41 (id)) 42 43 #define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name) 44 45 #define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init 0 46 47 #ifndef __ASSEMBLY__ 48 49 #include <linux/mm.h> 50 51 enum __kvm_host_smccc_func { 52 /* Hypercalls available only prior to pKVM finalisation */ 53 /* __KVM_HOST_SMCCC_FUNC___kvm_hyp_init */ 54 __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2 = __KVM_HOST_SMCCC_FUNC___kvm_hyp_init + 1, 55 __KVM_HOST_SMCCC_FUNC___pkvm_init, 56 __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping, 57 __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector, 58 __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs, 59 __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs, 60 __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config, 61 __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize, 62 63 /* Hypercalls available after pKVM finalisation */ 64 __KVM_HOST_SMCCC_FUNC___pkvm_host_share_hyp, 65 __KVM_HOST_SMCCC_FUNC___pkvm_host_unshare_hyp, 66 __KVM_HOST_SMCCC_FUNC___pkvm_host_reclaim_page, 67 __KVM_HOST_SMCCC_FUNC___pkvm_host_donate_guest, 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, 73 __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context, 74 __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff, 75 __KVM_HOST_SMCCC_FUNC___vgic_v3_save_vmcr_aprs, 76 __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_vmcr_aprs, 77 __KVM_HOST_SMCCC_FUNC___pkvm_init_shadow, 78 __KVM_HOST_SMCCC_FUNC___pkvm_init_shadow_vcpu, 79 __KVM_HOST_SMCCC_FUNC___pkvm_teardown_shadow, 80 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_load, 81 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_put, 82 __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_sync_state, 83 __KVM_HOST_SMCCC_FUNC___pkvm_iommu_driver_init, 84 __KVM_HOST_SMCCC_FUNC___pkvm_iommu_register, 85 __KVM_HOST_SMCCC_FUNC___pkvm_iommu_pm_notify, 86 __KVM_HOST_SMCCC_FUNC___pkvm_iommu_finalize, 87 }; 88 89 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] 90 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[] 91 92 /* 93 * Define a pair of symbols sharing the same name but one defined in 94 * VHE and the other in nVHE hyp implementations. 95 */ 96 #define DECLARE_KVM_HYP_SYM(sym) \ 97 DECLARE_KVM_VHE_SYM(sym); \ 98 DECLARE_KVM_NVHE_SYM(sym) 99 100 #define DECLARE_KVM_VHE_PER_CPU(type, sym) \ 101 DECLARE_PER_CPU(type, sym) 102 #define DECLARE_KVM_NVHE_PER_CPU(type, sym) \ 103 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym)) 104 105 #define DECLARE_KVM_HYP_PER_CPU(type, sym) \ 106 DECLARE_KVM_VHE_PER_CPU(type, sym); \ 107 DECLARE_KVM_NVHE_PER_CPU(type, sym) 108 109 /* 110 * Compute pointer to a symbol defined in nVHE percpu region. 111 * Returns NULL if percpu memory has not been allocated yet. 112 */ 113 #define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id()) 114 #define per_cpu_ptr_nvhe_sym(sym, cpu) \ 115 ({ \ 116 unsigned long base, off; \ 117 base = kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; \ 118 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ 119 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ 120 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ 121 }) 122 123 #if defined(__KVM_NVHE_HYPERVISOR__) 124 125 #define CHOOSE_NVHE_SYM(sym) sym 126 #define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym) 127 128 /* The nVHE hypervisor shouldn't even try to access VHE symbols */ 129 extern void *__nvhe_undefined_symbol; 130 #define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol 131 #define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol) 132 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol) 133 134 #elif defined(__KVM_VHE_HYPERVISOR__) 135 136 #define CHOOSE_VHE_SYM(sym) sym 137 #define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym) 138 139 /* The VHE hypervisor shouldn't even try to access nVHE symbols */ 140 extern void *__vhe_undefined_symbol; 141 #define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol 142 #define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol) 143 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol) 144 145 #else 146 147 /* 148 * BIG FAT WARNINGS: 149 * 150 * - Don't be tempted to change the following is_kernel_in_hyp_mode() 151 * to has_vhe(). has_vhe() is implemented as a *final* capability, 152 * while this is used early at boot time, when the capabilities are 153 * not final yet.... 154 * 155 * - Don't let the nVHE hypervisor have access to this, as it will 156 * pick the *wrong* symbol (yes, it runs at EL2...). 157 */ 158 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \ 159 ? CHOOSE_VHE_SYM(sym) \ 160 : CHOOSE_NVHE_SYM(sym)) 161 162 #define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \ 163 ? this_cpu_ptr(&sym) \ 164 : this_cpu_ptr_nvhe_sym(sym)) 165 166 #define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \ 167 ? per_cpu_ptr(&sym, cpu) \ 168 : per_cpu_ptr_nvhe_sym(sym, cpu)) 169 170 #define CHOOSE_VHE_SYM(sym) sym 171 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) 172 173 #endif 174 175 struct kvm_nvhe_init_params { 176 unsigned long mair_el2; 177 unsigned long tcr_el2; 178 unsigned long tpidr_el2; 179 unsigned long stack_hyp_va; 180 phys_addr_t pgd_pa; 181 unsigned long hcr_el2; 182 unsigned long vttbr; 183 unsigned long vtcr; 184 }; 185 186 /* Translate a kernel address @ptr into its equivalent linear mapping */ 187 #define kvm_ksym_ref(ptr) \ 188 ({ \ 189 void *val = (ptr); \ 190 if (!is_kernel_in_hyp_mode()) \ 191 val = lm_alias((ptr)); \ 192 val; \ 193 }) 194 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(__va_function(kvm_nvhe_sym(sym))) 195 196 struct kvm; 197 struct kvm_vcpu; 198 struct kvm_s2_mmu; 199 200 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init); 201 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); 202 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) 203 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) 204 205 extern unsigned long kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[]; 206 DECLARE_KVM_NVHE_SYM(__per_cpu_start); 207 DECLARE_KVM_NVHE_SYM(__per_cpu_end); 208 209 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); 210 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs) 211 212 extern void __kvm_flush_vm_context(void); 213 extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu); 214 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa, 215 int level); 216 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu); 217 218 extern void __kvm_timer_set_cntvoff(u64 cntvoff); 219 220 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); 221 222 extern void __kvm_adjust_pc(struct kvm_vcpu *vcpu); 223 224 extern u64 __vgic_v3_get_gic_config(void); 225 extern void __vgic_v3_init_lrs(void); 226 227 extern u64 __kvm_get_mdcr_el2(void); 228 229 #define __KVM_EXTABLE(from, to) \ 230 " .pushsection __kvm_ex_table, \"a\"\n" \ 231 " .align 3\n" \ 232 " .long (" #from " - .), (" #to " - .)\n" \ 233 " .popsection\n" 234 235 236 #define __kvm_at(at_op, addr) \ 237 ( { \ 238 int __kvm_at_err = 0; \ 239 u64 spsr, elr; \ 240 asm volatile( \ 241 " mrs %1, spsr_el2\n" \ 242 " mrs %2, elr_el2\n" \ 243 "1: at "at_op", %3\n" \ 244 " isb\n" \ 245 " b 9f\n" \ 246 "2: msr spsr_el2, %1\n" \ 247 " msr elr_el2, %2\n" \ 248 " mov %w0, %4\n" \ 249 "9:\n" \ 250 __KVM_EXTABLE(1b, 2b) \ 251 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ 252 : "r" (addr), "i" (-EFAULT)); \ 253 __kvm_at_err; \ 254 } ) 255 256 257 #else /* __ASSEMBLY__ */ 258 259 .macro get_host_ctxt reg, tmp 260 adr_this_cpu \reg, kvm_host_data, \tmp 261 add \reg, \reg, #HOST_DATA_CONTEXT 262 .endm 263 264 .macro get_vcpu_ptr vcpu, ctxt 265 get_host_ctxt \ctxt, \vcpu 266 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 267 .endm 268 269 .macro get_loaded_vcpu vcpu, ctxt 270 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu 271 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 272 .endm 273 274 .macro set_loaded_vcpu vcpu, ctxt, tmp 275 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp 276 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 277 .endm 278 279 /* 280 * KVM extable for unexpected exceptions. 281 * In the same format _asm_extable, but output to a different section so that 282 * it can be mapped to EL2. The KVM version is not sorted. The caller must 283 * ensure: 284 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented 285 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. 286 */ 287 .macro _kvm_extable, from, to 288 .pushsection __kvm_ex_table, "a" 289 .align 3 290 .long (\from - .), (\to - .) 291 .popsection 292 .endm 293 294 #define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x) 295 #define CPU_LR_OFFSET CPU_XREG_OFFSET(30) 296 #define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8) 297 298 /* 299 * We treat x18 as callee-saved as the host may use it as a platform 300 * register (e.g. for shadow call stack). 301 */ 302 .macro save_callee_saved_regs ctxt 303 str x18, [\ctxt, #CPU_XREG_OFFSET(18)] 304 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 305 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 306 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 307 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 308 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 309 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 310 .endm 311 312 .macro restore_callee_saved_regs ctxt 313 // We require \ctxt is not x18-x28 314 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)] 315 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 316 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 317 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 318 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 319 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 320 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 321 .endm 322 323 .macro save_sp_el0 ctxt, tmp 324 mrs \tmp, sp_el0 325 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 326 .endm 327 328 .macro restore_sp_el0 ctxt, tmp 329 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 330 msr sp_el0, \tmp 331 .endm 332 333 #endif 334 335 #endif /* __ARM_KVM_ASM_H__ */ 336