88da06ca76
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 In TDVF BSP and APs are simplified. BSP is the vCPU-0, while the others are treated as APs. So MP intialization is rather simple. ApWorker is not supported, BSP is always the working processor, while the APs are just in a wait-for-precedure state. 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: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Ray Ni <ray.ni@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
107 lines
3.8 KiB
C
107 lines
3.8 KiB
C
/** @file
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CPU MP Initialize Library common functions for Td guest.
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Copyright (c) 2020 - 2022, 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 "MpLib.h"
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#include "MpIntelTdx.h"
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/**
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Gets detailed MP-related information on the requested processor at the
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instant this call is made. This service may only be called from the BSP.
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In current stage only the BSP is workable. So ProcessorNumber should be 0.
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@param[in] ProcessorNumber The handle number of processor.
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@param[out] ProcessorInfoBuffer A pointer to the buffer where information for
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the requested processor is deposited.
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@param[out] HealthData Return processor health data.
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@retval EFI_SUCCESS Processor information was returned.
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@retval EFI_DEVICE_ERROR The calling processor is an AP.
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@retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL or ProcessorNumber is not 0.
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@retval EFI_NOT_FOUND The processor with the handle specified by
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ProcessorNumber does not exist in the platform.
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@retval EFI_NOT_READY MP Initialize Library is not initialized.
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**/
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EFI_STATUS
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TdxMpInitLibGetProcessorInfo (
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IN UINTN ProcessorNumber,
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OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer,
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OUT EFI_HEALTH_FLAGS *HealthData OPTIONAL
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)
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{
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UINTN OriginalProcessorNumber;
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//
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// Lower 24 bits contains the actual processor number.
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//
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OriginalProcessorNumber = ProcessorNumber;
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ProcessorNumber &= BIT24 - 1;
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if ((ProcessorInfoBuffer == NULL) || (ProcessorNumber != 0)) {
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return EFI_INVALID_PARAMETER;
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}
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ProcessorInfoBuffer->ProcessorId = 0;
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ProcessorInfoBuffer->StatusFlag = PROCESSOR_AS_BSP_BIT | PROCESSOR_ENABLED_BIT;
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ZeroMem (&ProcessorInfoBuffer->Location, sizeof (EFI_CPU_PHYSICAL_LOCATION));
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if ((OriginalProcessorNumber & CPU_V2_EXTENDED_TOPOLOGY) != 0) {
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ZeroMem (&ProcessorInfoBuffer->ExtendedInformation.Location2, sizeof (EFI_CPU_PHYSICAL_LOCATION2));
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}
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if (HealthData != NULL) {
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HealthData->Uint32 = 0;
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}
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return EFI_SUCCESS;
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}
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/**
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Retrieves the number of logical processor in the platform and the number of
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those logical processors that are enabled on this boot. This service may only
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be called from the BSP.
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@param[out] NumberOfProcessors Pointer to the total number of logical
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processors in the system, including the BSP
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and disabled APs.
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@param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical
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processors that exist in system, including
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the BSP.
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@retval EFI_SUCCESS The number of logical processors and enabled
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logical processors was retrieved.
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@retval EFI_DEVICE_ERROR The calling processor is an AP.
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@retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL and NumberOfEnabledProcessors
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is NULL.
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@retval EFI_NOT_READY MP Initialize Library is not initialized.
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**/
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EFI_STATUS
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TdxMpInitLibGetNumberOfProcessors (
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OUT UINTN *NumberOfProcessors, OPTIONAL
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OUT UINTN *NumberOfEnabledProcessors OPTIONAL
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)
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{
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ASSERT (NumberOfProcessors != NULL || NumberOfEnabledProcessors != NULL);
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//
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// In current stage only the BSP is workable. So NumberOfProcessors
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// & NumberOfEnableddProcessors are both 1.
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//
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if (NumberOfProcessors != NULL) {
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*NumberOfProcessors = 1;
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}
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if (NumberOfEnabledProcessors != NULL) {
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*NumberOfEnabledProcessors = 1;
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}
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return EFI_SUCCESS;
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}
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