xref: /openbmc/linux/arch/x86/include/asm/shared/tdx.h (revision 75d090fd)
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