On Sat, Feb 19, 2022 at 07:56:38PM +0800, Min Xu wrote: > RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 > > When host VMM create the Td guest, the system memory informations are > stored in TdHob, which is a memory region described in Tdx metadata. > The system memory region in TdHob should be accepted before it can be > accessed. So the newly added function (ProcessTdxHobList) is to process > the TdHobList to accept the memory. Because TdHobList is provided by > host VMM which is not trusted, so its content should be checked before > it is consumed by TDVF. > > Because ProcessTdxHobList is to be called in SEC phase, so > PlatformInitLib.inf is updated to support SEC. > > Note: In this patch it is BSP which accepts the pages. So there maybe > boot performance issue. There are some mitigations to this issue, such > as lazy accept, 2M accept page size, etc. We will re-visit here in the > future. > > PcdTdxAcceptPageSize is added for page accepting. Currently TDX supports > 4K and 2M accept page size. The default value is 2M. > > Tdx guest is only supported in X64. So for IA32 ProcessTdxHobList > just returns EFI_UNSUPPORTED.
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