2520182122
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 The IOMMU protocol driver provides capabilities to set a DMA access attribute and methods to allocate, free, map and unmap the DMA memory for the PCI Bus devices. The current IoMmuDxe driver supports DMA operations inside SEV guest. To support DMA operation in TDX guest, CC_GUEST_IS_XXX (PcdConfidentialComputingGuestAttr) is used to determine if it is SEV guest or TDX guest. Due to security reasons all DMA operations inside the SEV/TDX guest must be performed on shared pages. The IOMMU protocol driver for the SEV/TDX guest uses a bounce buffer to map guest DMA buffer to shared pages in order to provide the support for DMA operations inside SEV/TDX guest. The call of SEV or TDX specific function to set/clear EncMask/SharedBit is determined by CC_GUEST_IS_XXX (PcdConfidentialComputingGuestAttr). Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jordan Justen <jordan.l.justen@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: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
/** @file
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The protocol provides support to allocate, free, map and umap a DMA buffer
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for bus master (e.g PciHostBridge). When SEV is enabled, the DMA operations
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must be performed on unencrypted buffer hence protocol clear the encryption
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bit from the DMA buffer.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
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(C) Copyright 2017 Hewlett Packard Enterprise Development LP<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _AMD_SEV_IOMMU_H_
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#define _AMD_SEV_IOMMU_H_
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#include <Protocol/IoMmu.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/MemEncryptSevLib.h>
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#include <Library/MemEncryptTdxLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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/**
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Install IOMMU protocol to provide the DMA support for PciHostBridge.
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**/
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EFI_STATUS
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EFIAPI
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InstallIoMmuProtocol (
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VOID
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);
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#endif
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