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/** @file
Fetch the Tdx info.
Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <IndustryStandard/Tdx.h>
#include <Uefi/UefiBaseType.h>
#include <Library/TdxLib.h>
#include <Library/BaseMemoryLib.h>
UINT64 mTdSharedPageMask = 0;
UINT32 mTdMaxVCpuNum = 0;
UINT32 mTdVCpuNum = 0;
BOOLEAN mTdDataReturned = FALSE;
/**
This function call TDCALL_TDINFO to get the TD_RETURN_DATA.
If the TDCALL is successful, populate below variables:
- mTdSharedPageMask
- mTdMaxVCpunum
- mTdVCpuNum
- mTdDataReturned
@return TRUE The TDCALL is successful and above variables are populated.
@return FALSE The TDCALL is failed. Above variables are not set.
**/
BOOLEAN
GetTdInfo (
VOID
)
{
UINT64 Status;
TD_RETURN_DATA TdReturnData;
UINT8 Gpaw;
Status = TdCall (TDCALL_TDINFO, 0, 0, 0, &TdReturnData);
if (Status == TDX_EXIT_REASON_SUCCESS) {
Gpaw = (UINT8)(TdReturnData.TdInfo.Gpaw & 0x3f);
mTdSharedPageMask = 1ULL << (Gpaw - 1);
mTdMaxVCpuNum = TdReturnData.TdInfo.MaxVcpus;
mTdVCpuNum = TdReturnData.TdInfo.NumVcpus;
mTdDataReturned = TRUE;
} else {
DEBUG ((DEBUG_ERROR, "Failed call TDCALL_TDINFO. %llx\n", Status));
mTdDataReturned = FALSE;
}
return mTdDataReturned;
}
/**
This function gets the Td guest shared page mask.
The guest indicates if a page is shared using the Guest Physical Address
(GPA) Shared (S) bit. If the GPA Width(GPAW) is 48, the S-bit is bit-47.
If the GPAW is 52, the S-bit is bit-51.
@return Shared page bit mask
**/
UINT64
EFIAPI
TdSharedPageMask (
VOID
)
{
if (mTdDataReturned) {
return mTdSharedPageMask;
}
return GetTdInfo () ? mTdSharedPageMask : 0;
}
/**
This function gets the maximum number of Virtual CPUs that are usable for
Td Guest.
@return maximum Virtual CPUs number
**/
UINT32
EFIAPI
TdMaxVCpuNum (
VOID
)
{
if (mTdDataReturned) {
return mTdMaxVCpuNum;
}
return GetTdInfo () ? mTdMaxVCpuNum : 0;
}
/**
This function gets the number of Virtual CPUs that are usable for Td
Guest.
@return Virtual CPUs number
**/
UINT32
EFIAPI
TdVCpuNum (
VOID
)
{
if (mTdDataReturned) {
return mTdVCpuNum;
}
return GetTdInfo () ? mTdVCpuNum : 0;
}
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