Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when SEV is active

[Borislav Petkov]

On Fri, Sep 23, 2016 at 09:33:00PM +1200, Kai Huang wrote:
> How is this even possible? The spec clearly says under SEV only in long mode
> or PAE mode guest can control whether memory is encrypted via c-bit, and in
> other modes guest will be always in encrypted mode.

I was suggesting the hypervisor supplies the EFI ranges unencrypted. But
that is not a good idea because firmware data is exposed then, see same
thread from yesterday.

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