linux-kernel - Re: [PATCH v6 22/34] x86/mm: Add support for changing the memory encryption attribute

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Message-ID: <20170614162548.crwm44epddyrtgm6@pd.tnic>
Date:   Wed, 14 Jun 2017 18:25:48 +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 v6 22/34] x86/mm: Add support for changing the memory
 encryption attribute

On Wed, Jun 07, 2017 at 02:17:00PM -0500, Tom Lendacky wrote:
> Add support for changing the memory encryption attribute for one or more
> memory pages. This will be useful when we have to change the AP trampoline
> area to not be encrypted. Or when we need to change the SWIOTLB area to
> not be encrypted in support of devices that can't support the encryption
> mask range.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
>  arch/x86/include/asm/set_memory.h |    3 ++
>  arch/x86/mm/pageattr.c            |   62 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 65 insertions(+)

Patches 21-22:

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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