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

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Date:   Sat, 13 Jan 2018 14:10:10 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        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, Jan 13, 2018 at 12:30:11PM +0000, David Woodhouse wrote:
> 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

Doesn't seem to work, gets literal __stringy() crud in the .s file.