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