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