linux-kernel - Re: Yet another KPTI regression with 4.14.x series in a VM

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Message-ID: <1515846611.22302.567.camel@infradead.org>
Date:   Sat, 13 Jan 2018 12:30:11 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Laura Abbott <labbott@...hat.com>, X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: Yet another KPTI regression with 4.14.x series in a VM

On Sat, 2018-01-13 at 13:08 +0100, Peter Zijlstra wrote:
> 
>         ALTERNATIVE "orq $(PTI_SWITCH_PGTABLE_MASK), \scratch_reg",
>                     "orq $(PTI_SWITCH_MASK), \scratch_reg", X86_FEATURE_PCID
> 
> Is not wanting to compile though; probably that whole alternative vs
> macro thing again :/

Welcome to my world. Try

 ALTERNATIVE __stringify(orq $(PTI_SWITCH_PGTABLE_MASK), \scratch_reg), \
             __stringify(orq $(PTI_SWITCH_MASK), \scratch_reg), \
             X86_FEATURE_PCID
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