linux-kernel - Re: [PATCH v5 01/32] x86: Documentation for AMD Secure Memory Encryption (SME)

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Date:   Wed, 19 Apr 2017 17:38:19 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dave Young <dyoung@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v5 01/32] x86: Documentation for AMD Secure Memory
 Encryption (SME)

On Wed, Apr 19, 2017 at 09:23:47AM -0500, Tom Lendacky wrote:
> Btw, I tried to update all the subjects and descriptions to be
> more descriptive but I'm sure there is still room for improvement
> so keep the comments on them coming.

No worries there :)

> Note, just because the bit is set in %cr3 doesn't mean the full
> hierarchy is encrypted. Each level in the hierarchy needs to have the
> encryption bit set. So, theoretically, you could have the encryption
> bit set in %cr3 so that the PGD is encrypted, but not set the encryption
> bit in the PGD entry for a PUD and so the PUD pointed to by that entry
> would not be encrypted.

Ha, that is a nice detail I didn't realize. You could add it to the text.

Thanks.

-- 
Regards/Gruss,
    Boris.

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