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_VMCALL 0
15 #define TDG_VP_INFO 1
16 #define TDG_VP_VEINFO_GET 3
17 #define TDG_MR_REPORT 4
18 #define TDG_MEM_PAGE_ACCEPT 6
19 #define TDG_VM_RD 7
20 #define TDG_VM_WR 8
21
22 /* TDX TD-Scope Metadata. To be used by TDG.VM.WR and TDG.VM.RD */
23 #define TDCS_CONFIG_FLAGS 0x1110000300000016
24 #define TDCS_TD_CTLS 0x1110000300000017
25 #define TDCS_NOTIFY_ENABLES 0x9100000000000010
26
27 /* TDCS_CONFIG_FLAGS bits */
28 #define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1)
29
30 /* TDCS_TD_CTLS bits */
31 #define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(0)
32
33 /* TDX hypercall Leaf IDs */
34 #define TDVMCALL_MAP_GPA 0x10001
35 #define TDVMCALL_GET_QUOTE 0x10002
36 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003
37
38 #define TDVMCALL_STATUS_RETRY 1
39
40 /*
41 * Bitmasks of exposed registers (with VMM).
42 */
43 #define TDX_RDX BIT(2)
44 #define TDX_RBX BIT(3)
45 #define TDX_RSI BIT(6)
46 #define TDX_RDI BIT(7)
47 #define TDX_R8 BIT(8)
48 #define TDX_R9 BIT(9)
49 #define TDX_R10 BIT(10)
50 #define TDX_R11 BIT(11)
51 #define TDX_R12 BIT(12)
52 #define TDX_R13 BIT(13)
53 #define TDX_R14 BIT(14)
54 #define TDX_R15 BIT(15)
55
56 /*
57 * These registers are clobbered to hold arguments for each
58 * TDVMCALL. They are safe to expose to the VMM.
59 * Each bit in this mask represents a register ID. Bit field
60 * details can be found in TDX GHCI specification, section
61 * titled "TDCALL [TDG.VP.VMCALL] leaf".
62 */
63 #define TDVMCALL_EXPOSE_REGS_MASK \
64 (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
65 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
66
67 /* TDX supported page sizes from the TDX module ABI. */
68 #define TDX_PS_4K 0
69 #define TDX_PS_2M 1
70 #define TDX_PS_1G 2
71 #define TDX_PS_NR (TDX_PS_1G + 1)
72
73 #ifndef __ASSEMBLY__
74
75 #include <linux/compiler_attributes.h>
76
77 /*
78 * Used in __tdcall*() to gather the input/output registers' values of the
79 * TDCALL instruction when requesting services from the TDX module. This is a
80 * software only structure and not part of the TDX module/VMM ABI
81 */
82 struct tdx_module_args {
83 /* callee-clobbered */
84 u64 rcx;
85 u64 rdx;
86 u64 r8;
87 u64 r9;
88 /* extra callee-clobbered */
89 u64 r10;
90 u64 r11;
91 /* callee-saved + rdi/rsi */
92 u64 r12;
93 u64 r13;
94 u64 r14;
95 u64 r15;
96 u64 rbx;
97 u64 rdi;
98 u64 rsi;
99 };
100
101 /* Used to communicate with the TDX module */
102 u64 __tdcall(u64 fn, struct tdx_module_args *args);
103 u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
104 u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args);
105
106 /* Used to request services from the VMM */
107 u64 __tdx_hypercall(struct tdx_module_args *args);
108
109 /*
110 * Wrapper for standard use of __tdx_hypercall with no output aside from
111 * return code.
112 */
_tdx_hypercall(u64 fn,u64 r12,u64 r13,u64 r14,u64 r15)113 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
114 {
115 struct tdx_module_args args = {
116 .r10 = TDX_HYPERCALL_STANDARD,
117 .r11 = fn,
118 .r12 = r12,
119 .r13 = r13,
120 .r14 = r14,
121 .r15 = r15,
122 };
123
124 return __tdx_hypercall(&args);
125 }
126
127
128 /* Called from __tdx_hypercall() for unrecoverable failure */
129 void __noreturn __tdx_hypercall_failed(void);
130
131 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
132
133 /*
134 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
135 * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
136 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
137 * guest sides of these calls.
138 */
hcall_func(u64 exit_reason)139 static __always_inline u64 hcall_func(u64 exit_reason)
140 {
141 return exit_reason;
142 }
143
144 #endif /* !__ASSEMBLY__ */
145 #endif /* _ASM_X86_SHARED_TDX_H */
146