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 */
35struct 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 */
51u64 __tdx_hypercall(struct tdx_hypercall_args *args);
52u64 __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 */
58static 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 */
74void __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 */
81struct 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 */
91u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
92		      struct tdx_module_output *out);
93
94bool 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 */
102static __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