linux-kernel - Re: [RFC PATCH v2 10/20] x86: Insure that memory areas are encrypted when possible

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Message-ID: <20160912163349.exnuvr7svsq7fmui@pd.tnic>
Date:   Mon, 12 Sep 2016 18:33:49 +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,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v2 10/20] x86: Insure that memory areas are encrypted
 when possible

On Mon, Sep 12, 2016 at 10:05:36AM -0500, Tom Lendacky wrote:
> I can look into that.  The reason I put this here is this is all the
> early page fault support that is very specific to this file. I modified
> an existing static function to take advantage of the mapping support.

Yeah, but all this code is SME-specific and doesn't belong there.
AFAICT, it uses global/public symbols so there shouldn't be a problem to
have it in mem_encrypt.c.

> Hmmm, maybe... With the change to the early_memremap() the initrd is now
> identified as BOOT_DATA in relocate_initrd() and so it will be mapped
> and copied as non-encyrpted data. But since it was encrypted before the
> call to relocate_initrd() it will copy encrypted bytes which will later
> be accessed encrypted. That isn't clear though, so I'll rework
> reserve_initrd() to perform the sme_early_mem_enc() once at the end
> whether the initrd is re-located or not.

Makes sense.

-- 
Regards/Gruss,
    Boris.

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