xref: /openbmc/linux/arch/x86/include/asm/shared/tdx.h (revision 837197f4)
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