linux-kernel - Re: [patch V2 1/2] sysfs/cpu: Add vulnerability folder

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Date:   Mon, 8 Jan 2018 10:36:48 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Alexey Dobriyan <adobriyan@...il.com>
cc:     Konrad Rzeszutek Wilk <konrad@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [patch V2 1/2] sysfs/cpu: Add vulnerability folder

On Mon, 8 Jan 2018, Alexey Dobriyan wrote:
> On Sun, Jan 07, 2018 at 10:50:58PM -0500, Konrad Rzeszutek Wilk wrote:
> > On Mon, Jan 08, 2018 at 01:22:04AM +0300, Alexey Dobriyan wrote:
> > > Thomas Gleixner wrote:
> > > > Create /sys/devices/system/cpu/vulnerabilities folder and files for
> > > > meltdown, spectre_v1 and spectre_v2.
> > > 
> > > It is called "grep -e '^bugs' /proc/cpuinfo".
> > > 
> > > kpti is deduceable from .config and /proc/cmdline .
> > > If people don't know what .config they are running, god bless them.
> > 
> > It is not just for meltdown (kpti). You also have retpoline and IBRS
> > which is for spectre.
> 
> If you, as kernel developer, are sure that bug is properly mitigated
> to the best of your knowledge then clear the bit from the bug mask.

Nope. The CPU is still buggy and does not become less so because we set a
mitigation into effect.

Thanks,

	tglx