5bdb091133
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 Currently, the first time an AP is started for an SEV-SNP guest, it relies on the VMSA as set by the hypervisor. If the list of APIC IDs has been retrieved, this is not necessary. The list of APIC IDs will be identified by a GUIDed HOB. If the GUIDed HOB is present, use the SEV-SNP AP Create protocol to start the AP for the first time and each time thereafter. Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Cc: Ray Ni <ray.ni@intel.com> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Acked-by: Ray Ni <ray.ni@intel.com>
90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/** @file
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AMD SEV helper function.
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Copyright (c) 2021 - 2024, AMD Incorporated. 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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/**
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Create an SEV-SNP AP save area (VMSA) for use in running the vCPU.
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@param[in] CpuMpData Pointer to CPU MP Data
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@param[in] CpuData Pointer to CPU AP Data
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@param[in] ApicId APIC ID of the vCPU
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**/
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VOID
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SevSnpCreateSaveArea (
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IN CPU_MP_DATA *CpuMpData,
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IN CPU_AP_DATA *CpuData,
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UINT32 ApicId
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)
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{
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//
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// SEV-SNP is not support on 32-bit build.
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//
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ASSERT (FALSE);
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}
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/**
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Create SEV-SNP APs.
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@param[in] CpuMpData Pointer to CPU MP Data
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@param[in] ProcessorNumber The handle number of specified processor
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(-1 for all APs)
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**/
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VOID
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SevSnpCreateAP (
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IN CPU_MP_DATA *CpuMpData,
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IN INTN ProcessorNumber
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)
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{
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//
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// SEV-SNP is not support on 32-bit build.
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//
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ASSERT (FALSE);
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}
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/**
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Issue RMPADJUST to adjust the VMSA attribute of an SEV-SNP page.
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@param[in] PageAddress
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@param[in] VmsaPage
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@return RMPADJUST return value
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**/
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UINT32
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SevSnpRmpAdjust (
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IN EFI_PHYSICAL_ADDRESS PageAddress,
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IN BOOLEAN VmsaPage
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)
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{
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//
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// RMPADJUST is not supported in 32-bit mode
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//
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return RETURN_UNSUPPORTED;
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}
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/**
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Determine if the SEV-SNP AP Create protocol should be used.
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@param[in] CpuMpData Pointer to CPU MP Data
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@retval TRUE Use SEV-SNP AP Create protocol
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@retval FALSE Do not use SEV-SNP AP Create protocol
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**/
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BOOLEAN
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CanUseSevSnpCreateAP (
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IN CPU_MP_DATA *CpuMpData
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)
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{
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//
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// SEV-SNP is not supported on 32-bit build.
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//
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return FALSE;
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}
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