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 14 #define ARM_EXIT_WITH_SERROR_BIT 31 15 #define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT)) 16 #define ARM_EXCEPTION_IS_TRAP(x) (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP) 17 #define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT)) 18 19 #define ARM_EXCEPTION_IRQ 0 20 #define ARM_EXCEPTION_EL1_SERROR 1 21 #define ARM_EXCEPTION_TRAP 2 22 #define ARM_EXCEPTION_IL 3 23 /* The hyp-stub will return this for any kvm_call_hyp() call */ 24 #define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR 25 26 #define kvm_arm_exception_type \ 27 {ARM_EXCEPTION_IRQ, "IRQ" }, \ 28 {ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \ 29 {ARM_EXCEPTION_TRAP, "TRAP" }, \ 30 {ARM_EXCEPTION_HYP_GONE, "HYP_GONE" } 31 32 /* 33 * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code 34 * that jumps over this. 35 */ 36 #define KVM_VECTOR_PREAMBLE (2 * AARCH64_INSN_SIZE) 37 38 #define KVM_HOST_SMCCC_ID(id) \ 39 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \ 40 ARM_SMCCC_SMC_64, \ 41 ARM_SMCCC_OWNER_VENDOR_HYP, \ 42 (id)) 43 44 #define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name) 45 46 #define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init 0 47 #define __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run 1 48 #define __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context 2 49 #define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa 3 50 #define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid 4 51 #define __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context 5 52 #define __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff 6 53 #define __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs 7 54 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config 8 55 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_read_vmcr 9 56 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_write_vmcr 10 57 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs 11 58 #define __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2 12 59 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs 13 60 #define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs 14 61 #define __KVM_HOST_SMCCC_FUNC___pkvm_init 15 62 #define __KVM_HOST_SMCCC_FUNC___pkvm_create_mappings 16 63 #define __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping 17 64 #define __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector 18 65 #define __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize 19 66 #define __KVM_HOST_SMCCC_FUNC___pkvm_mark_hyp 20 67 #define __KVM_HOST_SMCCC_FUNC___kvm_adjust_pc 21 68 69 #ifndef __ASSEMBLY__ 70 71 #include <linux/mm.h> 72 73 #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] 74 #define DECLARE_KVM_NVHE_SYM(sym) extern char kvm_nvhe_sym(sym)[] 75 76 /* 77 * Define a pair of symbols sharing the same name but one defined in 78 * VHE and the other in nVHE hyp implementations. 79 */ 80 #define DECLARE_KVM_HYP_SYM(sym) \ 81 DECLARE_KVM_VHE_SYM(sym); \ 82 DECLARE_KVM_NVHE_SYM(sym) 83 84 #define DECLARE_KVM_VHE_PER_CPU(type, sym) \ 85 DECLARE_PER_CPU(type, sym) 86 #define DECLARE_KVM_NVHE_PER_CPU(type, sym) \ 87 DECLARE_PER_CPU(type, kvm_nvhe_sym(sym)) 88 89 #define DECLARE_KVM_HYP_PER_CPU(type, sym) \ 90 DECLARE_KVM_VHE_PER_CPU(type, sym); \ 91 DECLARE_KVM_NVHE_PER_CPU(type, sym) 92 93 /* 94 * Compute pointer to a symbol defined in nVHE percpu region. 95 * Returns NULL if percpu memory has not been allocated yet. 96 */ 97 #define this_cpu_ptr_nvhe_sym(sym) per_cpu_ptr_nvhe_sym(sym, smp_processor_id()) 98 #define per_cpu_ptr_nvhe_sym(sym, cpu) \ 99 ({ \ 100 unsigned long base, off; \ 101 base = kvm_arm_hyp_percpu_base[cpu]; \ 102 off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ 103 (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ 104 base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ 105 }) 106 107 #if defined(__KVM_NVHE_HYPERVISOR__) 108 109 #define CHOOSE_NVHE_SYM(sym) sym 110 #define CHOOSE_HYP_SYM(sym) CHOOSE_NVHE_SYM(sym) 111 112 /* The nVHE hypervisor shouldn't even try to access VHE symbols */ 113 extern void *__nvhe_undefined_symbol; 114 #define CHOOSE_VHE_SYM(sym) __nvhe_undefined_symbol 115 #define this_cpu_ptr_hyp_sym(sym) (&__nvhe_undefined_symbol) 116 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__nvhe_undefined_symbol) 117 118 #elif defined(__KVM_VHE_HYPERVISOR__) 119 120 #define CHOOSE_VHE_SYM(sym) sym 121 #define CHOOSE_HYP_SYM(sym) CHOOSE_VHE_SYM(sym) 122 123 /* The VHE hypervisor shouldn't even try to access nVHE symbols */ 124 extern void *__vhe_undefined_symbol; 125 #define CHOOSE_NVHE_SYM(sym) __vhe_undefined_symbol 126 #define this_cpu_ptr_hyp_sym(sym) (&__vhe_undefined_symbol) 127 #define per_cpu_ptr_hyp_sym(sym, cpu) (&__vhe_undefined_symbol) 128 129 #else 130 131 /* 132 * BIG FAT WARNINGS: 133 * 134 * - Don't be tempted to change the following is_kernel_in_hyp_mode() 135 * to has_vhe(). has_vhe() is implemented as a *final* capability, 136 * while this is used early at boot time, when the capabilities are 137 * not final yet.... 138 * 139 * - Don't let the nVHE hypervisor have access to this, as it will 140 * pick the *wrong* symbol (yes, it runs at EL2...). 141 */ 142 #define CHOOSE_HYP_SYM(sym) (is_kernel_in_hyp_mode() \ 143 ? CHOOSE_VHE_SYM(sym) \ 144 : CHOOSE_NVHE_SYM(sym)) 145 146 #define this_cpu_ptr_hyp_sym(sym) (is_kernel_in_hyp_mode() \ 147 ? this_cpu_ptr(&sym) \ 148 : this_cpu_ptr_nvhe_sym(sym)) 149 150 #define per_cpu_ptr_hyp_sym(sym, cpu) (is_kernel_in_hyp_mode() \ 151 ? per_cpu_ptr(&sym, cpu) \ 152 : per_cpu_ptr_nvhe_sym(sym, cpu)) 153 154 #define CHOOSE_VHE_SYM(sym) sym 155 #define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) 156 157 #endif 158 159 struct kvm_nvhe_init_params { 160 unsigned long mair_el2; 161 unsigned long tcr_el2; 162 unsigned long tpidr_el2; 163 unsigned long stack_hyp_va; 164 phys_addr_t pgd_pa; 165 unsigned long hcr_el2; 166 unsigned long vttbr; 167 unsigned long vtcr; 168 }; 169 170 /* Translate a kernel address @ptr into its equivalent linear mapping */ 171 #define kvm_ksym_ref(ptr) \ 172 ({ \ 173 void *val = (ptr); \ 174 if (!is_kernel_in_hyp_mode()) \ 175 val = lm_alias((ptr)); \ 176 val; \ 177 }) 178 #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym)) 179 180 struct kvm; 181 struct kvm_vcpu; 182 struct kvm_s2_mmu; 183 184 DECLARE_KVM_NVHE_SYM(__kvm_hyp_init); 185 DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); 186 #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) 187 #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) 188 189 extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; 190 DECLARE_KVM_NVHE_SYM(__per_cpu_start); 191 DECLARE_KVM_NVHE_SYM(__per_cpu_end); 192 193 DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); 194 #define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs) 195 196 extern void __kvm_flush_vm_context(void); 197 extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu); 198 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa, 199 int level); 200 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu); 201 202 extern void __kvm_timer_set_cntvoff(u64 cntvoff); 203 204 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); 205 206 extern void __kvm_adjust_pc(struct kvm_vcpu *vcpu); 207 208 extern u64 __vgic_v3_get_gic_config(void); 209 extern u64 __vgic_v3_read_vmcr(void); 210 extern void __vgic_v3_write_vmcr(u32 vmcr); 211 extern void __vgic_v3_init_lrs(void); 212 213 extern u32 __kvm_get_mdcr_el2(void); 214 215 #define __KVM_EXTABLE(from, to) \ 216 " .pushsection __kvm_ex_table, \"a\"\n" \ 217 " .align 3\n" \ 218 " .long (" #from " - .), (" #to " - .)\n" \ 219 " .popsection\n" 220 221 222 #define __kvm_at(at_op, addr) \ 223 ( { \ 224 int __kvm_at_err = 0; \ 225 u64 spsr, elr; \ 226 asm volatile( \ 227 " mrs %1, spsr_el2\n" \ 228 " mrs %2, elr_el2\n" \ 229 "1: at "at_op", %3\n" \ 230 " isb\n" \ 231 " b 9f\n" \ 232 "2: msr spsr_el2, %1\n" \ 233 " msr elr_el2, %2\n" \ 234 " mov %w0, %4\n" \ 235 "9:\n" \ 236 __KVM_EXTABLE(1b, 2b) \ 237 : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ 238 : "r" (addr), "i" (-EFAULT)); \ 239 __kvm_at_err; \ 240 } ) 241 242 243 #else /* __ASSEMBLY__ */ 244 245 .macro get_host_ctxt reg, tmp 246 adr_this_cpu \reg, kvm_host_data, \tmp 247 add \reg, \reg, #HOST_DATA_CONTEXT 248 .endm 249 250 .macro get_vcpu_ptr vcpu, ctxt 251 get_host_ctxt \ctxt, \vcpu 252 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 253 .endm 254 255 .macro get_loaded_vcpu vcpu, ctxt 256 adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu 257 ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 258 .endm 259 260 .macro set_loaded_vcpu vcpu, ctxt, tmp 261 adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp 262 str \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] 263 .endm 264 265 /* 266 * KVM extable for unexpected exceptions. 267 * In the same format _asm_extable, but output to a different section so that 268 * it can be mapped to EL2. The KVM version is not sorted. The caller must 269 * ensure: 270 * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented 271 * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. 272 */ 273 .macro _kvm_extable, from, to 274 .pushsection __kvm_ex_table, "a" 275 .align 3 276 .long (\from - .), (\to - .) 277 .popsection 278 .endm 279 280 #define CPU_XREG_OFFSET(x) (CPU_USER_PT_REGS + 8*x) 281 #define CPU_LR_OFFSET CPU_XREG_OFFSET(30) 282 #define CPU_SP_EL0_OFFSET (CPU_LR_OFFSET + 8) 283 284 /* 285 * We treat x18 as callee-saved as the host may use it as a platform 286 * register (e.g. for shadow call stack). 287 */ 288 .macro save_callee_saved_regs ctxt 289 str x18, [\ctxt, #CPU_XREG_OFFSET(18)] 290 stp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 291 stp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 292 stp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 293 stp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 294 stp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 295 stp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 296 .endm 297 298 .macro restore_callee_saved_regs ctxt 299 // We require \ctxt is not x18-x28 300 ldr x18, [\ctxt, #CPU_XREG_OFFSET(18)] 301 ldp x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)] 302 ldp x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)] 303 ldp x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)] 304 ldp x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)] 305 ldp x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)] 306 ldp x29, lr, [\ctxt, #CPU_XREG_OFFSET(29)] 307 .endm 308 309 .macro save_sp_el0 ctxt, tmp 310 mrs \tmp, sp_el0 311 str \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 312 .endm 313 314 .macro restore_sp_el0 ctxt, tmp 315 ldr \tmp, [\ctxt, #CPU_SP_EL0_OFFSET] 316 msr sp_el0, \tmp 317 .endm 318 319 #endif 320 321 #endif /* __ARM_KVM_ASM_H__ */ 322