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_MR_RTMR_EXTEND 2
17 #define TDG_VP_VEINFO_GET 3
18 #define TDG_MR_REPORT 4
19 #define TDG_MEM_PAGE_ACCEPT 6
20 #define TDG_VM_RD 7
21 #define TDG_VM_WR 8
22
23 /* TDX attributes */
24 #define TDX_ATTR_DEBUG_BIT 0
25 #define TDX_ATTR_DEBUG BIT_ULL(TDX_ATTR_DEBUG_BIT)
26 #define TDX_ATTR_HGS_PLUS_PROF_BIT 4
27 #define TDX_ATTR_HGS_PLUS_PROF BIT_ULL(TDX_ATTR_HGS_PLUS_PROF_BIT)
28 #define TDX_ATTR_PERF_PROF_BIT 5
29 #define TDX_ATTR_PERF_PROF BIT_ULL(TDX_ATTR_PERF_PROF_BIT)
30 #define TDX_ATTR_PMT_PROF_BIT 6
31 #define TDX_ATTR_PMT_PROF BIT_ULL(TDX_ATTR_PMT_PROF_BIT)
32 #define TDX_ATTR_ICSSD_BIT 16
33 #define TDX_ATTR_ICSSD BIT_ULL(TDX_ATTR_ICSSD_BIT)
34 #define TDX_ATTR_LASS_BIT 27
35 #define TDX_ATTR_LASS BIT_ULL(TDX_ATTR_LASS_BIT)
36 #define TDX_ATTR_SEPT_VE_DISABLE_BIT 28
37 #define TDX_ATTR_SEPT_VE_DISABLE BIT_ULL(TDX_ATTR_SEPT_VE_DISABLE_BIT)
38 #define TDX_ATTR_MIGRTABLE_BIT 29
39 #define TDX_ATTR_MIGRTABLE BIT_ULL(TDX_ATTR_MIGRTABLE_BIT)
40 #define TDX_ATTR_PKS_BIT 30
41 #define TDX_ATTR_PKS BIT_ULL(TDX_ATTR_PKS_BIT)
42 #define TDX_ATTR_KL_BIT 31
43 #define TDX_ATTR_KL BIT_ULL(TDX_ATTR_KL_BIT)
44 #define TDX_ATTR_TPA_BIT 62
45 #define TDX_ATTR_TPA BIT_ULL(TDX_ATTR_TPA_BIT)
46 #define TDX_ATTR_PERFMON_BIT 63
47 #define TDX_ATTR_PERFMON BIT_ULL(TDX_ATTR_PERFMON_BIT)
48
49 /* TDX TD-Scope Metadata. To be used by TDG.VM.WR and TDG.VM.RD */
50 #define TDCS_CONFIG_FLAGS 0x1110000300000016
51 #define TDCS_TD_CTLS 0x1110000300000017
52 #define TDCS_NOTIFY_ENABLES 0x9100000000000010
53 #define TDCS_TOPOLOGY_ENUM_CONFIGURED 0x9100000000000019
54
55 /* TDCS_CONFIG_FLAGS bits */
56 #define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1)
57
58 /* TDCS_TD_CTLS bits */
59 #define TD_CTLS_PENDING_VE_DISABLE_BIT 0
60 #define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(TD_CTLS_PENDING_VE_DISABLE_BIT)
61 #define TD_CTLS_ENUM_TOPOLOGY_BIT 1
62 #define TD_CTLS_ENUM_TOPOLOGY BIT_ULL(TD_CTLS_ENUM_TOPOLOGY_BIT)
63 #define TD_CTLS_VIRT_CPUID2_BIT 2
64 #define TD_CTLS_VIRT_CPUID2 BIT_ULL(TD_CTLS_VIRT_CPUID2_BIT)
65 #define TD_CTLS_REDUCE_VE_BIT 3
66 #define TD_CTLS_REDUCE_VE BIT_ULL(TD_CTLS_REDUCE_VE_BIT)
67 #define TD_CTLS_LOCK_BIT 63
68 #define TD_CTLS_LOCK BIT_ULL(TD_CTLS_LOCK_BIT)
69
70 /* TDX hypercall Leaf IDs */
71 #define TDVMCALL_GET_TD_VM_CALL_INFO 0x10000
72 #define TDVMCALL_MAP_GPA 0x10001
73 #define TDVMCALL_GET_QUOTE 0x10002
74 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003
75
76 /*
77 * TDG.VP.VMCALL Status Codes (returned in R10)
78 */
79 #define TDVMCALL_STATUS_SUCCESS 0x0000000000000000ULL
80 #define TDVMCALL_STATUS_RETRY 0x0000000000000001ULL
81 #define TDVMCALL_STATUS_INVALID_OPERAND 0x8000000000000000ULL
82 #define TDVMCALL_STATUS_ALIGN_ERROR 0x8000000000000002ULL
83 #define TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED 0x8000000000000003ULL
84
85 /*
86 * Bitmasks of exposed registers (with VMM).
87 */
88 #define TDX_RDX BIT(2)
89 #define TDX_RBX BIT(3)
90 #define TDX_RSI BIT(6)
91 #define TDX_RDI BIT(7)
92 #define TDX_R8 BIT(8)
93 #define TDX_R9 BIT(9)
94 #define TDX_R10 BIT(10)
95 #define TDX_R11 BIT(11)
96 #define TDX_R12 BIT(12)
97 #define TDX_R13 BIT(13)
98 #define TDX_R14 BIT(14)
99 #define TDX_R15 BIT(15)
100
101 /*
102 * These registers are clobbered to hold arguments for each
103 * TDVMCALL. They are safe to expose to the VMM.
104 * Each bit in this mask represents a register ID. Bit field
105 * details can be found in TDX GHCI specification, section
106 * titled "TDCALL [TDG.VP.VMCALL] leaf".
107 */
108 #define TDVMCALL_EXPOSE_REGS_MASK \
109 (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
110 TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
111
112 /* TDX supported page sizes from the TDX module ABI. */
113 #define TDX_PS_4K 0
114 #define TDX_PS_2M 1
115 #define TDX_PS_1G 2
116 #define TDX_PS_NR (TDX_PS_1G + 1)
117
118 #ifndef __ASSEMBLER__
119
120 #include <linux/compiler_attributes.h>
121
122 /*
123 * Used in __tdcall*() to gather the input/output registers' values of the
124 * TDCALL instruction when requesting services from the TDX module. This is a
125 * software only structure and not part of the TDX module/VMM ABI
126 */
127 struct tdx_module_args {
128 /* callee-clobbered */
129 u64 rcx;
130 u64 rdx;
131 u64 r8;
132 u64 r9;
133 /* extra callee-clobbered */
134 u64 r10;
135 u64 r11;
136 /* callee-saved + rdi/rsi */
137 u64 r12;
138 u64 r13;
139 u64 r14;
140 u64 r15;
141 u64 rbx;
142 u64 rdi;
143 u64 rsi;
144 };
145
146 /* Used to communicate with the TDX module */
147 u64 __tdcall(u64 fn, struct tdx_module_args *args);
148 u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
149 u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args);
150
151 /* Used to request services from the VMM */
152 u64 __tdx_hypercall(struct tdx_module_args *args);
153
154 /*
155 * Wrapper for standard use of __tdx_hypercall with no output aside from
156 * return code.
157 */
_tdx_hypercall(u64 fn,u64 r12,u64 r13,u64 r14,u64 r15)158 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
159 {
160 struct tdx_module_args args = {
161 .r10 = TDX_HYPERCALL_STANDARD,
162 .r11 = fn,
163 .r12 = r12,
164 .r13 = r13,
165 .r14 = r14,
166 .r15 = r15,
167 };
168
169 return __tdx_hypercall(&args);
170 }
171
172
173 /* Called from __tdx_hypercall() for unrecoverable failure */
174 void __noreturn __tdx_hypercall_failed(void);
175
176 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);
177
178 /*
179 * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
180 * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
181 * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
182 * guest sides of these calls.
183 */
hcall_func(u64 exit_reason)184 static __always_inline u64 hcall_func(u64 exit_reason)
185 {
186 return exit_reason;
187 }
188
189 #endif /* !__ASSEMBLER__ */
190 #endif /* _ASM_X86_SHARED_TDX_H */
191