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 TDX_GET_INFO 1
15 #define TDX_GET_VEINFO 3
16 #define TDX_GET_REPORT 4
17 #define TDX_ACCEPT_PAGE 6
18 #define TDX_WR 8
19
20 /* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
21 #define TDCS_NOTIFY_ENABLES 0x9100000000000010
22
23 /* TDX hypercall Leaf IDs */
24 #define TDVMCALL_MAP_GPA 0x10001
25 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003
26
27 #ifndef __ASSEMBLY__
28
29 /*
30 * Used in __tdx_hypercall() to pass down and get back registers' values of
31 * the TDCALL instruction when requesting services from the VMM.
32 *
33 * This is a software only structure and not part of the TDX module/VMM ABI.
34 */
35 struct tdx_hypercall_args {
36 u64 r8;
37 u64 r9;
38 u64 r10;
39 u64 r11;
40 u64 r12;
41 u64 r13;
42 u64 r14;
43 u64 r15;
44 u64 rdi;
45 u64 rsi;
46 u64 rbx;
47 u64 rdx;
48 };
49
50 /* Used to request services from the VMM */
51 u64 __tdx_hypercall(struct tdx_hypercall_args *args);
52 u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
53
54 /*
55 * Wrapper for standard use of __tdx_hypercall with no output aside from
56 * return code.
57 */
_tdx_hypercall(u64 fn,u64 r12,u64 r13,u64 r14,u64 r15)58 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
59 {
60 struct tdx_hypercall_args args = {
61 .r10 = TDX_HYPERCALL_STANDARD,
62 .r11 = fn,
63 .r12 = r12,
64 .r13 = r13,
65 .r14 = r14,
66 .r15 = r15,
67 };
68
69 return __tdx_hypercall(&args);
70 }
71
72
73 /* Called from __tdx_hypercall() for unrecoverable failure */
74 void __tdx_hypercall_failed(void);
75
76 /*
77 * Used in __tdx_module_call() to gather the output registers' values of the
78 * TDCALL instruction when requesting services from the TDX module. This is a
79 * software only structure and not part of the TDX module/VMM ABI
80 */
81 struct tdx_module_output {
82 u64 rcx;
83 u64 rdx;
84 u64 r8;
85 u64 r9;
86 u64 r10;
87 u64 r11;
88 };
89
90 /* Used to communicate with the TDX module */
91 u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
92 struct tdx_module_output *out);
93
94 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
95
96 /*
97 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
98 * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
99 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
100 * guest sides of these calls.
101 */
hcall_func(u64 exit_reason)102 static __always_inline u64 hcall_func(u64 exit_reason)
103 {
104 return exit_reason;
105 }
106
107 #endif /* !__ASSEMBLY__ */
108 #endif /* _ASM_X86_SHARED_TDX_H */
109