linux-kernel - Re: [RFC PATCH v2 12/20] x86: Add support for changing memory encryption attribute

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Message-ID: <20160912164132.zmqef4ozbggt5ovh@pd.tnic>
Date:   Mon, 12 Sep 2016 18:41:33 +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 12/20] x86: Add support for changing memory
 encryption attribute

On Mon, Sep 12, 2016 at 10:41:29AM -0500, Tom Lendacky wrote:
> Looking at __change_page_attr_set_clr() isn't it possible for some of
> the pages to be changed before an error is encountered since it is
> looping?  If so, we may still need to flush. The CPA_FLUSHTLB flag
> should take care of a failing case where no attributes have actually
> been changed.

Ah, yes, ok, then yours is correct.

-- 
Regards/Gruss,
    Boris.

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