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1 | /** @file\r |
2 | \r | |
3 | Secure Encrypted Virtualization (SEV) library helper function\r | |
4 | \r | |
5 | Copyright (c) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>\r | |
6 | \r | |
7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
8 | \r | |
9 | **/\r | |
10 | \r | |
11 | #include <Library/BaseLib.h>\r | |
12 | #include <Library/DebugLib.h>\r | |
13 | #include <Library/MemEncryptSevLib.h>\r | |
14 | #include <Library/PcdLib.h>\r | |
15 | #include <Register/Amd/Cpuid.h>\r | |
16 | #include <Register/Amd/Msr.h>\r | |
17 | #include <Register/Cpuid.h>\r | |
18 | #include <Uefi/UefiBaseType.h>\r | |
19 | \r | |
20 | /**\r | |
f1d1c337 BS |
21 | Read the workarea to determine whether SEV is enabled. If enabled,\r |
22 | then return the SevEsWorkArea pointer.\r | |
23 | \r | |
24 | **/\r | |
25 | STATIC\r | |
26 | SEC_SEV_ES_WORK_AREA *\r | |
27 | EFIAPI\r | |
28 | GetSevEsWorkArea (\r | |
29 | VOID\r | |
30 | )\r | |
31 | {\r | |
32 | OVMF_WORK_AREA *WorkArea;\r | |
33 | \r | |
34 | WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);\r | |
35 | \r | |
36 | //\r | |
37 | // If its not SEV guest then SevEsWorkArea is not valid.\r | |
38 | //\r | |
d020ac55 | 39 | if ((WorkArea == NULL) || (WorkArea->Header.GuestType != CcGuestTypeAmdSev)) {\r |
f1d1c337 BS |
40 | return NULL;\r |
41 | }\r | |
42 | \r | |
43 | return (SEC_SEV_ES_WORK_AREA *)FixedPcdGet32 (PcdSevEsWorkAreaBase);\r | |
44 | }\r | |
45 | \r | |
46 | /**\r | |
47 | Read the SEV Status MSR value from the workarea\r | |
a746ca5b TL |
48 | \r |
49 | **/\r | |
50 | STATIC\r | |
51 | UINT32\r | |
52 | EFIAPI\r | |
53 | InternalMemEncryptSevStatus (\r | |
54 | VOID\r | |
55 | )\r | |
56 | {\r | |
f1d1c337 BS |
57 | SEC_SEV_ES_WORK_AREA *SevEsWorkArea;\r |
58 | \r | |
59 | SevEsWorkArea = GetSevEsWorkArea ();\r | |
60 | if (SevEsWorkArea == NULL) {\r | |
61 | return 0;\r | |
a746ca5b TL |
62 | }\r |
63 | \r | |
f1d1c337 | 64 | return (UINT32)(UINTN)SevEsWorkArea->SevStatusMsrValue;\r |
a746ca5b TL |
65 | }\r |
66 | \r | |
d9822304 BS |
67 | /**\r |
68 | Returns a boolean to indicate whether SEV-SNP is enabled.\r | |
69 | \r | |
70 | @retval TRUE SEV-SNP is enabled\r | |
71 | @retval FALSE SEV-SNP is not enabled\r | |
72 | **/\r | |
73 | BOOLEAN\r | |
74 | EFIAPI\r | |
75 | MemEncryptSevSnpIsEnabled (\r | |
76 | VOID\r | |
77 | )\r | |
78 | {\r | |
79 | MSR_SEV_STATUS_REGISTER Msr;\r | |
80 | \r | |
81 | Msr.Uint32 = InternalMemEncryptSevStatus ();\r | |
82 | \r | |
83 | return Msr.Bits.SevSnpBit ? TRUE : FALSE;\r | |
84 | }\r | |
85 | \r | |
a746ca5b TL |
86 | /**\r |
87 | Returns a boolean to indicate whether SEV-ES is enabled.\r | |
88 | \r | |
89 | @retval TRUE SEV-ES is enabled\r | |
90 | @retval FALSE SEV-ES is not enabled\r | |
91 | **/\r | |
92 | BOOLEAN\r | |
93 | EFIAPI\r | |
94 | MemEncryptSevEsIsEnabled (\r | |
95 | VOID\r | |
96 | )\r | |
97 | {\r | |
ac0a286f | 98 | MSR_SEV_STATUS_REGISTER Msr;\r |
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99 | \r |
100 | Msr.Uint32 = InternalMemEncryptSevStatus ();\r | |
101 | \r | |
102 | return Msr.Bits.SevEsBit ? TRUE : FALSE;\r | |
103 | }\r | |
104 | \r | |
105 | /**\r | |
106 | Returns a boolean to indicate whether SEV is enabled.\r | |
107 | \r | |
108 | @retval TRUE SEV is enabled\r | |
109 | @retval FALSE SEV is not enabled\r | |
110 | **/\r | |
111 | BOOLEAN\r | |
112 | EFIAPI\r | |
113 | MemEncryptSevIsEnabled (\r | |
114 | VOID\r | |
115 | )\r | |
116 | {\r | |
ac0a286f | 117 | MSR_SEV_STATUS_REGISTER Msr;\r |
a746ca5b TL |
118 | \r |
119 | Msr.Uint32 = InternalMemEncryptSevStatus ();\r | |
120 | \r | |
121 | return Msr.Bits.SevBit ? TRUE : FALSE;\r | |
122 | }\r | |
123 | \r | |
124 | /**\r | |
125 | Returns the SEV encryption mask.\r | |
126 | \r | |
127 | @return The SEV pagtable encryption mask\r | |
128 | **/\r | |
129 | UINT64\r | |
130 | EFIAPI\r | |
131 | MemEncryptSevGetEncryptionMask (\r | |
132 | VOID\r | |
133 | )\r | |
134 | {\r | |
f1d1c337 BS |
135 | SEC_SEV_ES_WORK_AREA *SevEsWorkArea;\r |
136 | \r | |
137 | SevEsWorkArea = GetSevEsWorkArea ();\r | |
138 | if (SevEsWorkArea == NULL) {\r | |
139 | return 0;\r | |
a746ca5b TL |
140 | }\r |
141 | \r | |
f1d1c337 | 142 | return SevEsWorkArea->EncryptionMask;\r |
a746ca5b TL |
143 | }\r |
144 | \r | |
145 | /**\r | |
146 | Locate the page range that covers the initial (pre-SMBASE-relocation) SMRAM\r | |
147 | Save State Map.\r | |
148 | \r | |
149 | @param[out] BaseAddress The base address of the lowest-address page that\r | |
150 | covers the initial SMRAM Save State Map.\r | |
151 | \r | |
152 | @param[out] NumberOfPages The number of pages in the page range that covers\r | |
153 | the initial SMRAM Save State Map.\r | |
154 | \r | |
155 | @retval RETURN_SUCCESS BaseAddress and NumberOfPages have been set on\r | |
156 | output.\r | |
157 | \r | |
158 | @retval RETURN_UNSUPPORTED SMM is unavailable.\r | |
159 | **/\r | |
160 | RETURN_STATUS\r | |
161 | EFIAPI\r | |
162 | MemEncryptSevLocateInitialSmramSaveStateMapPages (\r | |
ac0a286f MK |
163 | OUT UINTN *BaseAddress,\r |
164 | OUT UINTN *NumberOfPages\r | |
a746ca5b TL |
165 | )\r |
166 | {\r | |
167 | return RETURN_UNSUPPORTED;\r | |
168 | }\r |