linux-kernel - Re: tip/master falls off NOP cliff with KPTI under KVM

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Message-ID: <CAA42JLZe+_dCcbam-_KE-kGYCHbZ2OCyJTHV02yznwrdJVJ2hg@mail.gmail.com>
Date:   Wed, 24 Jan 2018 16:53:25 -0800
From:   Dexuan-Linux Cui <dexuan.linux@...il.com>
To:     "Woodhouse, David" <dwmw@...zon.co.uk>
Cc:     Alexey Dobriyan <adobriyan@...il.com>, pbonzini@...hat.com,
        rkrcmar@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, dave.hansen@...ux.intel.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org, x86@...nel.org,
        arjan@...ux.intel.com, decui@...rosoft.com
Subject: Re: tip/master falls off NOP cliff with KPTI under KVM

On Wed, Jan 10, 2018 at 2:53 PM, Woodhouse, David <dwmw@...zon.co.uk> wrote:
> On Thu, 2018-01-11 at 01:34 +0300, Alexey Dobriyan wrote:
>>
>> Bisection points to
>>
>>         f3433c1010c6af61c9897f0f0447f81b991feac1 is the first bad commit
>>         commit f3433c1010c6af61c9897f0f0447f81b991feac1
>>         Author: David Woodhouse <dwmw@...zon.co.uk>
>>         Date:   Tue Jan 9 14:43:11 2018 +0000
>>
>>             x86/retpoline/entry: Convert entry assembler indirect jumps
>
> Thanks. We've fixed the underlying problem with the alternatives
> mechanism, *and* changed the retpoline code not to actually rely on
> said fix.

Hi David and all,
It looks the latest upstream tree did fix the issue.
Can you please specify the related commit(s) that fixed the issue?
I need to cherry-pick the fix. I suppose a quick reply from you would save
 me a lot of time. :-)

Thanks!

-- Dexuan