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_INFO 1
15 #define TDG_VP_VEINFO_GET 3
16 #define TDG_MR_REPORT 4
17 #define TDG_MEM_PAGE_ACCEPT 6
18 #define TDG_VM_RD 7
19 #define TDG_VM_WR 8
20
21 /* TDX TD-Scope Metadata. To be used by TDG.VM.WR and TDG.VM.RD */
22 #define TDCS_CONFIG_FLAGS 0x1110000300000016
23 #define TDCS_TD_CTLS 0x1110000300000017
24 #define TDCS_NOTIFY_ENABLES 0x9100000000000010
25
26 /* TDCS_CONFIG_FLAGS bits */
27 #define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1)
28
29 /* TDCS_TD_CTLS bits */
30 #define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(0)
31
32 /* TDX hypercall Leaf IDs */
33 #define TDVMCALL_MAP_GPA 0x10001
34 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003
35
36 #ifndef __ASSEMBLY__
37
38 /*
39 * Used in __tdx_hypercall() to pass down and get back registers' values of
40 * the TDCALL instruction when requesting services from the VMM.
41 *
42 * This is a software only structure and not part of the TDX module/VMM ABI.
43 */
44 struct tdx_hypercall_args {
45 u64 r8;
46 u64 r9;
47 u64 r10;
48 u64 r11;
49 u64 r12;
50 u64 r13;
51 u64 r14;
52 u64 r15;
53 u64 rdi;
54 u64 rsi;
55 u64 rbx;
56 u64 rdx;
57 };
58
59 /* Used to request services from the VMM */
60 u64 __tdx_hypercall(struct tdx_hypercall_args *args);
61 u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
62
63 /*
64 * Wrapper for standard use of __tdx_hypercall with no output aside from
65 * return code.
66 */
_tdx_hypercall(u64 fn,u64 r12,u64 r13,u64 r14,u64 r15)67 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
68 {
69 struct tdx_hypercall_args args = {
70 .r10 = TDX_HYPERCALL_STANDARD,
71 .r11 = fn,
72 .r12 = r12,
73 .r13 = r13,
74 .r14 = r14,
75 .r15 = r15,
76 };
77
78 return __tdx_hypercall(&args);
79 }
80
81
82 /* Called from __tdx_hypercall() for unrecoverable failure */
83 void __tdx_hypercall_failed(void);
84
85 /*
86 * Used in __tdcall*() to gather the input/output registers' values of the
87 * TDCALL instruction when requesting services from the TDX module. This is a
88 * software only structure and not part of the TDX module/VMM ABI
89 */
90 struct tdx_module_args {
91 u64 rcx;
92 u64 rdx;
93 u64 r8;
94 u64 r9;
95 u64 r10;
96 u64 r11;
97 };
98
99 /* Used to communicate with the TDX module */
100 u64 __tdcall(u64 fn, struct tdx_module_args *args);
101 u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
102
103 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
104
105 /*
106 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
107 * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
108 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
109 * guest sides of these calls.
110 */
hcall_func(u64 exit_reason)111 static __always_inline u64 hcall_func(u64 exit_reason)
112 {
113 return exit_reason;
114 }
115
116 #endif /* !__ASSEMBLY__ */
117 #endif /* _ASM_X86_SHARED_TDX_H */
118