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From: "Min Xu" <min.m.xu@intel.com>
To: Gerd Hoffmann <kraxel@redhat.com>, "Yao, Jiewen" <jiewen.yao@intel.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>,
	"Aktas, Erdem" <erdemaktas@google.com>,
	James Bottomley <jejb@linux.ibm.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Michael Roth <michael.roth@amd.com>
Subject: Re: [PATCH V2 04/10] OvmfPkg/IntelTdx: Implement other helper functions in SecTdxHelperLib
Date: Fri, 20 Jan 2023 11:42:19 +0000	[thread overview]
Message-ID: <PH0PR11MB50642B461C0CB8C337E1D7CCC5C59@PH0PR11MB5064.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20230120101828.jf43j7ahxqossace@sirius.home.kraxel.org>

On January 20, 2023 6:18 PM, Gerd Hoffmann wrote:
> On Fri, Jan 20, 2023 at 08:10:45AM +0000, Yao, Jiewen wrote:
> > > Can we define FV_HANDOFF_TABLE_POINTERS2 and
> FV_HANDOFF_TABLE_POINTERS2 in
> MdePkg/Include/IndustryStandard/UefiTcgPlatform.h?
> >
> > [Jiewen] No. We cannot move to MdePkg.
> > TCG defines the field to be variable length. Something like below:
> >
> > typedef struct {
> >   UINT8                      TableDescriptionSize;
> >   UINT8                      TableDescription[TableDescriptionSize];
> >   UINT64                     NumberOfTables;
> >   EFI_CONFIGURATION_TABLE    TableEntry[NumberOfTables];
> > } HANDOFF_TABLE_POINTERS2;
> >
> > typedef struct {
> >   UINT8                   BlobDescriptionSize;
> >   UINT8                   BlobDescription[BlobDescriptionSize];
> >   EFI_PHYSICAL_ADDRESS    BlobBase;
> >   UINT64                  BlobLength;
> > } HANDOFF_TABLE_POINTERS2;
> >
> > The implementation can choose its own length as they wish.
> 
> Why doesn't follow TDX standard TCG practices here?
> 
As Jiewen mentioned TCG defines the field to be variable length. The implementation can choose its own length. Below are some examples.
Tcg2Pei defines its FV_HANDOFF_TABLE_POINTERS2. (https://github.com/tianocore/edk2/blob/master/SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c#L126-L136)
SmbiosMeasurementDxe defines its SMBIOS_HANDOFF_TABLE_POINTERS2 (https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Universal/SmbiosMeasurementDxe/SmbiosMeasurementDxe.c#L113-L123)
TcgEventLogRecordLib defines the PLATFORM_FIRMWARE_BLOB2_STRUCT and HANDOFF_TABLE_POINTERS2_STRUCT. https://github.com/tianocore/edk2/blob/master/SecurityPkg/Include/Library/TcgEventLogRecordLib.h#L14-L32

I think TDX follow the same practice above to define its own TDX_HANDOFF_TABLE_POINTERS2 and FV_HANDOFF_TABLE_POINTERS2. (FV_HANDOFF_TABLE_POINTERS2 happens to be same as the one in Tcg2Pei.) To make the definition more clear, TDX can define the name as CFV_HANDOFF_TABLE_POINTERS2.

@Gerd, Hoffmann what's your thought?

Thanks
Min


  reply	other threads:[~2023-01-20 11:42 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-19  3:28 [PATCH V2 00/10] Enable Tdx measurement in OvmfPkgX64 Min Xu
2023-01-19  3:28 ` [PATCH V2 01/10] OvmfPkg: Add Tdx measurement data structure in WorkArea Min Xu
2023-01-19  9:33   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 02/10] OvmfPkg/IntelTdx: Add TdxHelperLibNull Min Xu
2023-01-19  9:33   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 03/10] OvmfPkg/IntelTdx: Add SecTdxHelperLib Min Xu
2023-01-19  9:33   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 04/10] OvmfPkg/IntelTdx: Implement other helper functions in SecTdxHelperLib Min Xu
2023-01-19  9:54   ` Gerd Hoffmann
2023-01-19 23:44     ` Min Xu
2023-01-20  7:40     ` Min Xu
2023-01-20  8:10       ` Yao, Jiewen
2023-01-20 10:18         ` Gerd Hoffmann
2023-01-20 11:42           ` Min Xu [this message]
2023-01-20 13:50             ` Gerd Hoffmann
2023-01-21  0:02               ` Min Xu
2023-01-19  3:28 ` [PATCH V2 05/10] OvmfPkg/IntelTdx: Add PeiTdxHelperLib Min Xu
2023-01-19  9:54   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 06/10] OvmfPkg/PeilessStartupLib: Build GuidHob for Tdx measurements Min Xu
2023-01-19  9:57   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 07/10] OvmfPkg/IntelTdx: Update tdx measurement in SEC phase Min Xu
2023-01-19  9:57   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 08/10] OvmfPkg: Enable Tdx measurement in OvmfPkgX64 Min Xu
2023-01-19  3:28 ` [PATCH V2 09/10] OvmfPkg/PlatformPei: Build GuidHob for Tdx measurement Min Xu
2023-01-19  9:58   ` Gerd Hoffmann
2023-01-19  3:28 ` [PATCH V2 10/10] OvmfPkg/PlatformInitLib: Delete the ProcessTdxHobList() Min Xu

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