linux-kernel - Re: [RFC PATCH v4 28/28] x86: Add support to make use of Secure Memory Encryption

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Date:   Tue, 7 Mar 2017 18:42:51 +0100
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,
        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>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Larry Woodman <lwoodman@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [RFC PATCH v4 28/28] x86: Add support to make use of Secure
 Memory Encryption

On Tue, Mar 07, 2017 at 10:05:00AM -0600, Tom Lendacky wrote:
> I can do that.  Because phys_base hasn't been updated yet, I'll have to
> create "on" and "off" constants and get their address in a similar way
> to the command line option so that I can do the strncmp properly.

Actually, wouldn't it be simpler to inspect the passed in buffer for
containing the chars 'o', 'n' - in that order, or 'o', 'f', 'f' - in
that order too? Because __cmdline_find_option() does copy the option
characters into the buffer.

Then you wouldn't need those "on" and "off" constants...

-- 
Regards/Gruss,
    Boris.

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