linux-kernel - Re: [RFC Part1 PATCH v3 13/17] x86/io: Unroll string I/O when SEV is active

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Message-ID: <95314c89-2620-8bb7-cbe8-cd9bc3adabb0@amd.com>
Date:   Fri, 15 Sep 2017 09:13:00 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     brijesh.singh@....com, "H. Peter Anvin" <hpa@...or.com>,
        Arnd Bergmann <arnd@...db.de>,
        David Laight <David.Laight@...lab.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        David Howells <dhowells@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Christoph Lameter <cl@...ux.com>,
        Jonathan Corbet <corbet@....net>,
        Radim Krcmár <rkrcmar@...hat.com>,
        Piotr Luc <piotr.luc@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Airlie <airlied@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Laura Abbott <labbott@...hat.com>,
        Tony Luck <tony.luck@...el.com>, Ard.Biesheuvel@...or.com
Subject: Re: [RFC Part1 PATCH v3 13/17] x86/io: Unroll string I/O when SEV is
 active



On 09/15/2017 07:24 AM, Borislav Petkov wrote:
> On Tue, Aug 22, 2017 at 06:52:48PM +0200, Borislav Petkov wrote:
>> As always, the devil is in the detail.
> 
> Ok, actually we can make this much simpler by using a static key. A
> conceptual patch below - I only need to fix that crazy include hell I'm
> stepping into with this.
> 
> In any case, we were talking about having a static branch already so
> this fits the whole strategy.
> 

thanks for the suggestion Boris, it will make patch much simpler.
I will try this out.

-Brijesh