1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (C) 2021-2022 Intel Corporation */ 3 #ifndef _ASM_X86_TDX_H 4 #define _ASM_X86_TDX_H 5 6 #include <linux/init.h> 7 #include <linux/bits.h> 8 #include <asm/ptrace.h> 9 #include <asm/shared/tdx.h> 10 11 /* 12 * SW-defined error codes. 13 * 14 * Bits 47:40 == 0xFF indicate Reserved status code class that never used by 15 * TDX module. 16 */ 17 #define TDX_ERROR _BITUL(63) 18 #define TDX_SW_ERROR (TDX_ERROR | GENMASK_ULL(47, 40)) 19 #define TDX_SEAMCALL_VMFAILINVALID (TDX_SW_ERROR | _UL(0xFFFF0000)) 20 21 #ifndef __ASSEMBLY__ 22 23 /* 24 * Used to gather the output registers values of the TDCALL and SEAMCALL 25 * instructions when requesting services from the TDX module. 26 * 27 * This is a software only structure and not part of the TDX module/VMM ABI. 28 */ 29 struct tdx_module_output { 30 u64 rcx; 31 u64 rdx; 32 u64 r8; 33 u64 r9; 34 u64 r10; 35 u64 r11; 36 }; 37 38 /* 39 * Used by the #VE exception handler to gather the #VE exception 40 * info from the TDX module. This is a software only structure 41 * and not part of the TDX module/VMM ABI. 42 */ 43 struct ve_info { 44 u64 exit_reason; 45 u64 exit_qual; 46 /* Guest Linear (virtual) Address */ 47 u64 gla; 48 /* Guest Physical Address */ 49 u64 gpa; 50 u32 instr_len; 51 u32 instr_info; 52 }; 53 54 #ifdef CONFIG_INTEL_TDX_GUEST 55 56 void __init tdx_early_init(void); 57 58 /* Used to communicate with the TDX module */ 59 u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9, 60 struct tdx_module_output *out); 61 62 void tdx_get_ve_info(struct ve_info *ve); 63 64 bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve); 65 66 void tdx_safe_halt(void); 67 68 bool tdx_early_handle_ve(struct pt_regs *regs); 69 70 #else 71 72 static inline void tdx_early_init(void) { }; 73 static inline void tdx_safe_halt(void) { }; 74 75 static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; } 76 77 #endif /* CONFIG_INTEL_TDX_GUEST */ 78 79 #if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST) 80 long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2, 81 unsigned long p3, unsigned long p4); 82 #else 83 static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, 84 unsigned long p2, unsigned long p3, 85 unsigned long p4) 86 { 87 return -ENODEV; 88 } 89 #endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */ 90 #endif /* !__ASSEMBLY__ */ 91 #endif /* _ASM_X86_TDX_H */ 92