linux-kernel - Re: cpu_no_speculation omissions?

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Message-ID: <20180726155405.GX1392@brightrain.aerifal.cx>
Date:   Thu, 26 Jul 2018 11:54:05 -0400
From:   Rich Felker <dalias@...c.org>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Jiri Kosina <jikos@...nel.org>, Alan Cox <alan@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: cpu_no_speculation omissions?

On Thu, Jul 26, 2018 at 04:18:42PM +0200, Joerg Roedel wrote:
> On Thu, Jul 26, 2018 at 03:29:53PM +0200, Jiri Kosina wrote:
> > On Mon, 16 Jul 2018, Alan Cox wrote:
> > > The pre Silvermont atom cores are in order. When I did the original
> > > list I didn't bother with all the 32bit cores as we didn't have any
> > > 32bit mitigations then.
> > 
> > Now that 32bit PTI is in tip, I believe refresh of that list would be 
> > justified. CCing Joerg.
> 
> Agreed, PTI for x86-32 is in -tip now and will likely make it into
> v4.19. In-order cores (which should not be not affected by Meltdown)
> should be on the list, otherwise they will get a huge performance hit.

Does anyone have a complete list of pre-speculation Atom models? Mine
is one of the few 64-bit ones, but there are lots of 32-bit Atoms that
PTI would hit hard.

Rich