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1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (C) 2021-2022 Intel Corporation */
3#ifndef _ASM_X86_TDX_H
4#define _ASM_X86_TDX_H
5
6#include <linux/init.h>
7#include <linux/bits.h>
8#include <asm/ptrace.h>
9#include <asm/shared/tdx.h>
10
11/*
12 * SW-defined error codes.
13 *
14 * Bits 47:40 == 0xFF indicate Reserved status code class that never used by
15 * TDX module.
16 */
17#define TDX_ERROR _BITUL(63)
18#define TDX_SW_ERROR (TDX_ERROR | GENMASK_ULL(47, 40))
19#define TDX_SEAMCALL_VMFAILINVALID (TDX_SW_ERROR | _UL(0xFFFF0000))
20
21#ifndef __ASSEMBLY__
22
23/*
24 * Used to gather the output registers values of the TDCALL and SEAMCALL
25 * instructions when requesting services from the TDX module.
26 *
27 * This is a software only structure and not part of the TDX module/VMM ABI.
28 */
29struct tdx_module_output {
30 u64 rcx;
31 u64 rdx;
32 u64 r8;
33 u64 r9;
34 u64 r10;
35 u64 r11;
36};
37
38/*
39 * Used by the #VE exception handler to gather the #VE exception
40 * info from the TDX module. This is a software only structure
41 * and not part of the TDX module/VMM ABI.
42 */
43struct ve_info {
44 u64 exit_reason;
45 u64 exit_qual;
46 /* Guest Linear (virtual) Address */
47 u64 gla;
48 /* Guest Physical Address */
49 u64 gpa;
50 u32 instr_len;
51 u32 instr_info;
52};
53
54#ifdef CONFIG_INTEL_TDX_GUEST
55
56void __init tdx_early_init(void);
57
58/* Used to communicate with the TDX module */
59u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
60 struct tdx_module_output *out);
61
62void tdx_get_ve_info(struct ve_info *ve);
63
64bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);
65
66void tdx_safe_halt(void);
67
68bool tdx_early_handle_ve(struct pt_regs *regs);
69
70int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport);
71
72#else
73
74static inline void tdx_early_init(void) { };
75static inline void tdx_safe_halt(void) { };
76
77static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; }
78
79#endif /* CONFIG_INTEL_TDX_GUEST */
80
81#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST)
82long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
83 unsigned long p3, unsigned long p4);
84#else
85static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
86 unsigned long p2, unsigned long p3,
87 unsigned long p4)
88{
89 return -ENODEV;
90}
91#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */
92#endif /* !__ASSEMBLY__ */
93#endif /* _ASM_X86_TDX_H */