c3001cb744
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 TdxLib is created with functions to perform the related Tdx operation. This includes functions for: - TdAcceptPages : Accept pending private pages and initialize the pages to all-0 using the TD ephemeral private key. - TdExtendRtmr : Extend measurement to one of the RTMR registers. - TdSharedPageMask: Get the Td guest shared page mask which indicates it is a Shared or Private page. - TdMaxVCpuNum : Get the maximum number of virtual CPUs. - TdVCpuNum : Get the number of virtual CPUs. Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/** @file
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Fetch the Tdx info.
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Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <IndustryStandard/Tdx.h>
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#include <Uefi/UefiBaseType.h>
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#include <Library/TdxLib.h>
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#include <Library/BaseMemoryLib.h>
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UINT64 mTdSharedPageMask = 0;
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UINT32 mTdMaxVCpuNum = 0;
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UINT32 mTdVCpuNum = 0;
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BOOLEAN mTdDataReturned = FALSE;
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/**
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This function call TDCALL_TDINFO to get the TD_RETURN_DATA.
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If the TDCALL is successful, populate below variables:
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- mTdSharedPageMask
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- mTdMaxVCpunum
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- mTdVCpuNum
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- mTdDataReturned
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@return TRUE The TDCALL is successful and above variables are populated.
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@return FALSE The TDCALL is failed. Above variables are not set.
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**/
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BOOLEAN
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GetTdInfo (
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VOID
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)
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{
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UINT64 Status;
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TD_RETURN_DATA TdReturnData;
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UINT8 Gpaw;
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Status = TdCall (TDCALL_TDINFO, 0, 0, 0, &TdReturnData);
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if (Status == TDX_EXIT_REASON_SUCCESS) {
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Gpaw = (UINT8)(TdReturnData.TdInfo.Gpaw & 0x3f);
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mTdSharedPageMask = 1ULL << (Gpaw - 1);
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mTdMaxVCpuNum = TdReturnData.TdInfo.MaxVcpus;
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mTdVCpuNum = TdReturnData.TdInfo.NumVcpus;
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mTdDataReturned = TRUE;
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} else {
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DEBUG ((DEBUG_ERROR, "Failed call TDCALL_TDINFO. %llx\n", Status));
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mTdDataReturned = FALSE;
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}
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return mTdDataReturned;
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}
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/**
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This function gets the Td guest shared page mask.
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The guest indicates if a page is shared using the Guest Physical Address
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(GPA) Shared (S) bit. If the GPA Width(GPAW) is 48, the S-bit is bit-47.
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If the GPAW is 52, the S-bit is bit-51.
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@return Shared page bit mask
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**/
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UINT64
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EFIAPI
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TdSharedPageMask (
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VOID
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)
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{
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if (mTdDataReturned) {
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return mTdSharedPageMask;
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}
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return GetTdInfo () ? mTdSharedPageMask : 0;
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}
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/**
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This function gets the maximum number of Virtual CPUs that are usable for
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Td Guest.
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@return maximum Virtual CPUs number
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**/
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UINT32
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EFIAPI
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TdMaxVCpuNum (
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VOID
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)
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{
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if (mTdDataReturned) {
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return mTdMaxVCpuNum;
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}
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return GetTdInfo () ? mTdMaxVCpuNum : 0;
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}
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/**
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This function gets the number of Virtual CPUs that are usable for Td
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Guest.
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@return Virtual CPUs number
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**/
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UINT32
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EFIAPI
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TdVCpuNum (
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VOID
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)
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{
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if (mTdDataReturned) {
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return mTdVCpuNum;
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}
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return GetTdInfo () ? mTdVCpuNum : 0;
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}
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