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