[edk2-rfc] [edk2-devel] RFC: design review for TDVF in OVMF

[Paolo Bonzini]

On 09/06/21 16:28, James Bottomley wrote:
> That would cut across the ApEntrypoint and the guidedStructureEnd.
> However, nothing says anything in the reset vector guided structure has
> to be data ... so it could equally well be code.  That means we can do
> guid based entries that contain the 32 bit real and 64 bit entry
> points.  This would also come with the added advantage that we can scan
> the OVMF binary to see what entry points it supports.

Isn't the initial state included in the save area just like for SEV-ES? 
  So it's not even QEMU, but rather some external tool that builds the 
encrypted image, that needs to understand that GUIDed structure.

The GUIDed structure can either include the entry point code; or it 
could have room for a couple 8-byte pointers since any fixed-size area 
in the GUIDed structure would be just a jump anyway.

Paolo



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