projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| c3001cb7 MX |
1 | /** @file\r |
| 2 | \r | |
| 3 | Fetch the Tdx info.\r | |
| 4 | \r | |
| 5 | Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>\r | |
| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 7 | \r | |
| 8 | **/\r | |
| 9 | \r | |
| 10 | #include <Library/BaseLib.h>\r | |
| 11 | #include <Library/DebugLib.h>\r | |
| 12 | #include <IndustryStandard/Tdx.h>\r | |
| 13 | #include <Uefi/UefiBaseType.h>\r | |
| 14 | #include <Library/TdxLib.h>\r | |
| 15 | #include <Library/BaseMemoryLib.h>\r | |
| 16 | \r | |
| 17 | UINT64 mTdSharedPageMask = 0;\r | |
| 18 | UINT32 mTdMaxVCpuNum = 0;\r | |
| 19 | UINT32 mTdVCpuNum = 0;\r | |
| 20 | BOOLEAN mTdDataReturned = FALSE;\r | |
| 21 | \r | |
| 22 | /**\r | |
| 23 | This function call TDCALL_TDINFO to get the TD_RETURN_DATA.\r | |
| 24 | If the TDCALL is successful, populate below variables:\r | |
| 25 | - mTdSharedPageMask\r | |
| 26 | - mTdMaxVCpunum\r | |
| 27 | - mTdVCpuNum\r | |
| 28 | - mTdDataReturned\r | |
| 29 | \r | |
| 30 | @return TRUE The TDCALL is successful and above variables are populated.\r | |
| 31 | @return FALSE The TDCALL is failed. Above variables are not set.\r | |
| 32 | **/\r | |
| 33 | BOOLEAN\r | |
| 34 | GetTdInfo (\r | |
| 35 | VOID\r | |
| 36 | )\r | |
| 37 | {\r | |
| 38 | UINT64 Status;\r | |
| 39 | TD_RETURN_DATA TdReturnData;\r | |
| 40 | UINT8 Gpaw;\r | |
| 41 | \r | |
| 42 | Status = TdCall (TDCALL_TDINFO, 0, 0, 0, &TdReturnData);\r | |
| 43 | if (Status == TDX_EXIT_REASON_SUCCESS) {\r | |
| 44 | Gpaw = (UINT8)(TdReturnData.TdInfo.Gpaw & 0x3f);\r | |
| 45 | mTdSharedPageMask = 1ULL << (Gpaw - 1);\r | |
| 46 | mTdMaxVCpuNum = TdReturnData.TdInfo.MaxVcpus;\r | |
| 47 | mTdVCpuNum = TdReturnData.TdInfo.NumVcpus;\r | |
| 48 | mTdDataReturned = TRUE;\r | |
| 49 | } else {\r | |
| 50 | DEBUG ((DEBUG_ERROR, "Failed call TDCALL_TDINFO. %llx\n", Status));\r | |
| 51 | mTdDataReturned = FALSE;\r | |
| 52 | }\r | |
| 53 | \r | |
| 54 | return mTdDataReturned;\r | |
| 55 | }\r | |
| 56 | \r | |
| 57 | /**\r | |
| 58 | This function gets the Td guest shared page mask.\r | |
| 59 | \r | |
| 60 | The guest indicates if a page is shared using the Guest Physical Address\r | |
| 61 | (GPA) Shared (S) bit. If the GPA Width(GPAW) is 48, the S-bit is bit-47.\r | |
| 62 | If the GPAW is 52, the S-bit is bit-51.\r | |
| 63 | \r | |
| 64 | @return Shared page bit mask\r | |
| 65 | **/\r | |
| 66 | UINT64\r | |
| 67 | EFIAPI\r | |
| 68 | TdSharedPageMask (\r | |
| 69 | VOID\r | |
| 70 | )\r | |
| 71 | {\r | |
| 72 | if (mTdDataReturned) {\r | |
| 73 | return mTdSharedPageMask;\r | |
| 74 | }\r | |
| 75 | \r | |
| 76 | return GetTdInfo () ? mTdSharedPageMask : 0;\r | |
| 77 | }\r | |
| 78 | \r | |
| 79 | /**\r | |
| 80 | This function gets the maximum number of Virtual CPUs that are usable for\r | |
| 81 | Td Guest.\r | |
| 82 | \r | |
| 83 | @return maximum Virtual CPUs number\r | |
| 84 | **/\r | |
| 85 | UINT32\r | |
| 86 | EFIAPI\r | |
| 87 | TdMaxVCpuNum (\r | |
| 88 | VOID\r | |
| 89 | )\r | |
| 90 | {\r | |
| 91 | if (mTdDataReturned) {\r | |
| 92 | return mTdMaxVCpuNum;\r | |
| 93 | }\r | |
| 94 | \r | |
| 95 | return GetTdInfo () ? mTdMaxVCpuNum : 0;\r | |
| 96 | }\r | |
| 97 | \r | |
| 98 | /**\r | |
| 99 | This function gets the number of Virtual CPUs that are usable for Td\r | |
| 100 | Guest.\r | |
| 101 | \r | |
| 102 | @return Virtual CPUs number\r | |
| 103 | **/\r | |
| 104 | UINT32\r | |
| 105 | EFIAPI\r | |
| 106 | TdVCpuNum (\r | |
| 107 | VOID\r | |
| 108 | )\r | |
| 109 | {\r | |
| 110 | if (mTdDataReturned) {\r | |
| 111 | return mTdVCpuNum;\r | |
| 112 | }\r | |
| 113 | \r | |
| 114 | return GetTdInfo () ? mTdVCpuNum : 0;\r | |
| 115 | }\r |