1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_SHARED_TDX_H 3 #define _ASM_X86_SHARED_TDX_H 4 5 #include <linux/bits.h> 6 #include <linux/types.h> 7 8 #define TDX_HYPERCALL_STANDARD 0 9 10 #define TDX_CPUID_LEAF_ID 0x21 11 #define TDX_IDENT "IntelTDX " 12 13 /* TDX module Call Leaf IDs */ 14 #define TDG_VP_VMCALL 0 15 #define TDG_VP_INFO 1 16 #define TDG_VP_VEINFO_GET 3 17 #define TDG_MR_REPORT 4 18 #define TDG_MEM_PAGE_ACCEPT 6 19 #define TDG_VM_RD 7 20 #define TDG_VM_WR 8 21 22 /* TDX TD-Scope Metadata. To be used by TDG.VM.WR and TDG.VM.RD */ 23 #define TDCS_CONFIG_FLAGS 0x1110000300000016 24 #define TDCS_TD_CTLS 0x1110000300000017 25 #define TDCS_NOTIFY_ENABLES 0x9100000000000010 26 #define TDCS_TOPOLOGY_ENUM_CONFIGURED 0x9100000000000019 27 28 /* TDCS_CONFIG_FLAGS bits */ 29 #define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1) 30 31 /* TDCS_TD_CTLS bits */ 32 #define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(0) 33 #define TD_CTLS_ENUM_TOPOLOGY BIT_ULL(1) 34 35 /* TDX hypercall Leaf IDs */ 36 #define TDVMCALL_MAP_GPA 0x10001 37 #define TDVMCALL_GET_QUOTE 0x10002 38 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003 39 40 #define TDVMCALL_STATUS_RETRY 1 41 42 /* 43 * Bitmasks of exposed registers (with VMM). 44 */ 45 #define TDX_RDX BIT(2) 46 #define TDX_RBX BIT(3) 47 #define TDX_RSI BIT(6) 48 #define TDX_RDI BIT(7) 49 #define TDX_R8 BIT(8) 50 #define TDX_R9 BIT(9) 51 #define TDX_R10 BIT(10) 52 #define TDX_R11 BIT(11) 53 #define TDX_R12 BIT(12) 54 #define TDX_R13 BIT(13) 55 #define TDX_R14 BIT(14) 56 #define TDX_R15 BIT(15) 57 58 /* 59 * These registers are clobbered to hold arguments for each 60 * TDVMCALL. They are safe to expose to the VMM. 61 * Each bit in this mask represents a register ID. Bit field 62 * details can be found in TDX GHCI specification, section 63 * titled "TDCALL [TDG.VP.VMCALL] leaf". 64 */ 65 #define TDVMCALL_EXPOSE_REGS_MASK \ 66 (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \ 67 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15) 68 69 /* TDX supported page sizes from the TDX module ABI. */ 70 #define TDX_PS_4K 0 71 #define TDX_PS_2M 1 72 #define TDX_PS_1G 2 73 #define TDX_PS_NR (TDX_PS_1G + 1) 74 75 #ifndef __ASSEMBLY__ 76 77 #include <linux/compiler_attributes.h> 78 79 /* 80 * Used in __tdcall*() to gather the input/output registers' values of the 81 * TDCALL instruction when requesting services from the TDX module. This is a 82 * software only structure and not part of the TDX module/VMM ABI 83 */ 84 struct tdx_module_args { 85 /* callee-clobbered */ 86 u64 rcx; 87 u64 rdx; 88 u64 r8; 89 u64 r9; 90 /* extra callee-clobbered */ 91 u64 r10; 92 u64 r11; 93 /* callee-saved + rdi/rsi */ 94 u64 r12; 95 u64 r13; 96 u64 r14; 97 u64 r15; 98 u64 rbx; 99 u64 rdi; 100 u64 rsi; 101 }; 102 103 /* Used to communicate with the TDX module */ 104 u64 __tdcall(u64 fn, struct tdx_module_args *args); 105 u64 __tdcall_ret(u64 fn, struct tdx_module_args *args); 106 u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args); 107 108 /* Used to request services from the VMM */ 109 u64 __tdx_hypercall(struct tdx_module_args *args); 110 111 /* 112 * Wrapper for standard use of __tdx_hypercall with no output aside from 113 * return code. 114 */ 115 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15) 116 { 117 struct tdx_module_args args = { 118 .r10 = TDX_HYPERCALL_STANDARD, 119 .r11 = fn, 120 .r12 = r12, 121 .r13 = r13, 122 .r14 = r14, 123 .r15 = r15, 124 }; 125 126 return __tdx_hypercall(&args); 127 } 128 129 130 /* Called from __tdx_hypercall() for unrecoverable failure */ 131 void __noreturn __tdx_hypercall_failed(void); 132 133 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end); 134 135 /* 136 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined 137 * independently from but are currently matched 1:1 with VMX EXIT_REASONs. 138 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and 139 * guest sides of these calls. 140 */ 141 static __always_inline u64 hcall_func(u64 exit_reason) 142 { 143 return exit_reason; 144 } 145 146 #endif /* !__ASSEMBLY__ */ 147 #endif /* _ASM_X86_SHARED_TDX_H */ 148