linux-kernel - Re: [PATCH v5 05/32] x86/CPU/AMD: Handle SME reduction in physical address size

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Message-ID: <20170420185237.g5toqhgbemhcfu36@pd.tnic>
Date:   Thu, 20 Apr 2017 20:52:37 +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 v5 05/32] x86/CPU/AMD: Handle SME reduction in physical
 address size

On Thu, Apr 20, 2017 at 12:29:20PM -0500, Tom Lendacky wrote:
> Hmmm... and actually if cpu_has(X86_FEATURE_SME) is true then it's a
> given that extended_cpuid_level >= 0x8000001f.  So this can be
> simplified to just:
> 
> 	if (cpu_has(c, X86_FEATURE_SME)) {
> 		... the rest of your suggestion (minus cpu_has()) ...

Cool, even better! :)

-- 
Regards/Gruss,
    Boris.

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