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1 | /** @file\r | |
2 | VMGEXIT Base Support Library.\r | |
3 | \r | |
4 | Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | #include <Base.h>\r | |
10 | #include <Uefi.h>\r | |
11 | #include <Library/VmgExitLib.h>\r | |
12 | \r | |
13 | /**\r | |
14 | Perform VMGEXIT.\r | |
15 | \r | |
16 | Sets the necessary fields of the GHCB, invokes the VMGEXIT instruction and\r | |
17 | then handles the return actions.\r | |
18 | \r | |
19 | The base library function returns an error in the form of a\r | |
20 | GHCB_EVENT_INJECTION representing a GP_EXCEPTION.\r | |
21 | \r | |
22 | @param[in, out] Ghcb A pointer to the GHCB\r | |
23 | @param[in] ExitCode VMGEXIT code to be assigned to the SwExitCode\r | |
24 | field of the GHCB.\r | |
25 | @param[in] ExitInfo1 VMGEXIT information to be assigned to the\r | |
26 | SwExitInfo1 field of the GHCB.\r | |
27 | @param[in] ExitInfo2 VMGEXIT information to be assigned to the\r | |
28 | SwExitInfo2 field of the GHCB.\r | |
29 | \r | |
30 | @retval 0 VMGEXIT succeeded.\r | |
31 | @return Exception number to be propagated, VMGEXIT\r | |
32 | processing did not succeed.\r | |
33 | \r | |
34 | **/\r | |
35 | UINT64\r | |
36 | EFIAPI\r | |
37 | VmgExit (\r | |
38 | IN OUT GHCB *Ghcb,\r | |
39 | IN UINT64 ExitCode,\r | |
40 | IN UINT64 ExitInfo1,\r | |
41 | IN UINT64 ExitInfo2\r | |
42 | )\r | |
43 | {\r | |
44 | GHCB_EVENT_INJECTION Event;\r | |
45 | \r | |
46 | Event.Uint64 = 0;\r | |
47 | Event.Elements.Vector = GP_EXCEPTION;\r | |
48 | Event.Elements.Type = GHCB_EVENT_INJECTION_TYPE_EXCEPTION;\r | |
49 | Event.Elements.Valid = 1;\r | |
50 | \r | |
51 | return Event.Uint64;\r | |
52 | }\r | |
53 | \r | |
54 | /**\r | |
55 | Perform pre-VMGEXIT initialization/preparation.\r | |
56 | \r | |
57 | Performs the necessary steps in preparation for invoking VMGEXIT. Must be\r | |
58 | called before setting any fields within the GHCB.\r | |
59 | \r | |
60 | @param[in, out] Ghcb A pointer to the GHCB\r | |
61 | @param[in, out] InterruptState A pointer to hold the current interrupt\r | |
62 | state, used for restoring in VmgDone ()\r | |
63 | \r | |
64 | **/\r | |
65 | VOID\r | |
66 | EFIAPI\r | |
67 | VmgInit (\r | |
68 | IN OUT GHCB *Ghcb,\r | |
69 | IN OUT BOOLEAN *InterruptState\r | |
70 | )\r | |
71 | {\r | |
72 | }\r | |
73 | \r | |
74 | /**\r | |
75 | Perform post-VMGEXIT cleanup.\r | |
76 | \r | |
77 | Performs the necessary steps to cleanup after invoking VMGEXIT. Must be\r | |
78 | called after obtaining needed fields within the GHCB.\r | |
79 | \r | |
80 | @param[in, out] Ghcb A pointer to the GHCB\r | |
81 | @param[in] InterruptState An indicator to conditionally (re)enable\r | |
82 | interrupts\r | |
83 | \r | |
84 | **/\r | |
85 | VOID\r | |
86 | EFIAPI\r | |
87 | VmgDone (\r | |
88 | IN OUT GHCB *Ghcb,\r | |
89 | IN BOOLEAN InterruptState\r | |
90 | )\r | |
91 | {\r | |
92 | }\r | |
93 | \r | |
94 | /**\r | |
95 | Marks a field at the specified offset as valid in the GHCB.\r | |
96 | \r | |
97 | The ValidBitmap area represents the areas of the GHCB that have been marked\r | |
98 | valid. Set the bit in ValidBitmap for the input offset.\r | |
99 | \r | |
100 | @param[in, out] Ghcb Pointer to the Guest-Hypervisor Communication Block\r | |
101 | @param[in] Offset Qword offset in the GHCB to mark valid\r | |
102 | \r | |
103 | **/\r | |
104 | VOID\r | |
105 | EFIAPI\r | |
106 | VmgSetOffsetValid (\r | |
107 | IN OUT GHCB *Ghcb,\r | |
108 | IN GHCB_REGISTER Offset\r | |
109 | )\r | |
110 | {\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Checks if a specified offset is valid in the GHCB.\r | |
115 | \r | |
116 | The ValidBitmap area represents the areas of the GHCB that have been marked\r | |
117 | valid. Return whether the bit in the ValidBitmap is set for the input offset.\r | |
118 | \r | |
119 | @param[in] Ghcb A pointer to the GHCB\r | |
120 | @param[in] Offset Qword offset in the GHCB to mark valid\r | |
121 | \r | |
122 | @retval TRUE Offset is marked valid in the GHCB\r | |
123 | @retval FALSE Offset is not marked valid in the GHCB\r | |
124 | \r | |
125 | **/\r | |
126 | BOOLEAN\r | |
127 | EFIAPI\r | |
128 | VmgIsOffsetValid (\r | |
129 | IN GHCB *Ghcb,\r | |
130 | IN GHCB_REGISTER Offset\r | |
131 | )\r | |
132 | {\r | |
133 | return FALSE;\r | |
134 | }\r | |
135 | \r | |
136 | /**\r | |
137 | Handle a #VC exception.\r | |
138 | \r | |
139 | Performs the necessary processing to handle a #VC exception.\r | |
140 | \r | |
141 | The base library function returns an error equal to VC_EXCEPTION,\r | |
142 | to be propagated to the standard exception handling stack.\r | |
143 | \r | |
144 | @param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set\r | |
145 | as value to use on error.\r | |
146 | @param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT\r | |
147 | \r | |
148 | @retval EFI_SUCCESS Exception handled\r | |
149 | @retval EFI_UNSUPPORTED #VC not supported, (new) exception value to\r | |
150 | propagate provided\r | |
151 | @retval EFI_PROTOCOL_ERROR #VC handling failed, (new) exception value to\r | |
152 | propagate provided\r | |
153 | \r | |
154 | **/\r | |
155 | EFI_STATUS\r | |
156 | EFIAPI\r | |
157 | VmgExitHandleVc (\r | |
158 | IN OUT EFI_EXCEPTION_TYPE *ExceptionType,\r | |
159 | IN OUT EFI_SYSTEM_CONTEXT SystemContext\r | |
160 | )\r | |
161 | {\r | |
162 | *ExceptionType = VC_EXCEPTION;\r | |
163 | \r | |
164 | return EFI_UNSUPPORTED;\r | |
165 | }\r |