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Message-ID: <20160922191138.lnp4ac3cfkiebjo3@pd.tnic>
Date: Thu, 22 Sep 2016 21:11:38 +0200
From: Borislav Petkov <bp@...e.de>
To: Tom Lendacky <thomas.lendacky@....com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Brijesh Singh <brijesh.singh@....com>,
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Subject: Re: [RFC PATCH v1 09/28] x86/efi: Access EFI data as encrypted when
SEV is active
On Thu, Sep 22, 2016 at 02:04:27PM -0500, Tom Lendacky wrote:
> That's not what I mean here. If the BIOS sets the SMEE bit in the
> SYS_CFG msr then, even if the encryption bit is never used, there is
> still a reduction in physical address space.
I thought that reduction is the reservation of bits for the SME mask.
What other reduction is there?
> Transparent SME (TSME) will be a BIOS option that will result in the
> memory controller performing encryption no matter what. In this case
> all data will be encrypted without a reduction in physical address
> space.
Now I'm confused: aren't we reducing the address space with the SME
mask?
Or what reduction do you mean?
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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