linux-kernel - Re: [RFC PATCH v1 05/28] KVM: SVM: prepare for new bit definition in nested

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Message-ID: <20160922141739.zgnj6gadzcdtsyut@pd.tnic>
Date:   Thu, 22 Sep 2016 16:17:39 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     simon.guinot@...uanux.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, rkrcmar@...hat.com, matt@...eblueprint.co.uk,
        linus.walleij@...aro.org, linux-mm@...ck.org,
        paul.gortmaker@...driver.com, hpa@...or.com,
        dan.j.williams@...el.com, aarcange@...hat.com,
        sfr@...b.auug.org.au, andriy.shevchenko@...ux.intel.com,
        herbert@...dor.apana.org.au, bhe@...hat.com, xemul@...allels.com,
        joro@...tes.org, x86@...nel.org, mingo@...hat.com,
        msalter@...hat.com, ross.zwisler@...ux.intel.com,
        dyoung@...hat.com, thomas.lendacky@....com, jroedel@...e.de,
        keescook@...omium.org, toshi.kani@....com,
        mathieu.desnoyers@...icios.com, devel@...uxdriverproject.org,
        tglx@...utronix.de, mchehab@...nel.org, iamjoonsoo.kim@....com,
        labbott@...oraproject.org, tony.luck@...el.com,
        alexandre.bounine@....com, kuleshovmail@...il.com,
        linux-kernel@...r.kernel.org, mcgrof@...nel.org,
        linux-crypto@...r.kernel.org, pbonzini@...hat.com,
        akpm@...ux-foundation.org, davem@...emloft.net
Subject: Re: [RFC PATCH v1 05/28] KVM: SVM: prepare for new bit definition in
 nested_ctl

On Mon, Aug 22, 2016 at 07:24:32PM -0400, Brijesh Singh wrote:
> From: Tom Lendacky <thomas.lendacky@....com>
> 
> Currently the nested_ctl variable in the vmcb_control_area structure is
> used to indicate nested paging support. The nested paging support field
> is actually defined as bit 0 of the this field. In order to support a new
> feature flag the usage of the nested_ctl and nested paging support must
> be converted to operate on a single bit.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
>  arch/x86/include/asm/svm.h |    2 ++
>  arch/x86/kvm/svm.c         |    7 ++++---
>  2 files changed, 6 insertions(+), 3 deletions(-)

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

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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