linux-kernel - Re: [PATCH 0/7] IBRS patch series

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Date:   Fri, 5 Jan 2018 15:01:45 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yves-Alexis Perez <corsac@...ian.org>
Cc:     Henrique de Moraes Holschuh <hmh@...ian.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Justin Forbes <jmforbes@...uxtx.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] IBRS patch series

On Fri, Jan 05, 2018 at 02:47:45PM +0100, Yves-Alexis Perez wrote:
> On Fri, 2018-01-05 at 14:28 +0100, Greg KH wrote:
> > > iucode-tool -L -tr n10ur16w.iso |grep 2017-11
> > >    001/020: sig 0x000306d4, pf_mask 0xc0, 2017-11-17, rev 0x0028, size
> > > 18432
> > 
> > That's been out for a while now:
> >         https://downloadcenter.intel.com/download/27337/Linux-Processor-Micr
> > ocode-Data-File
> > 
> > so I really don't think this is an "update" yet.
> 
> Actually for my processor (0x000306d4 / i5-5200U) this release (20171117) only
> contains:
> 
>   050/001: sig 0x000306d4, pf_mask 0xc0, 2017-01-27, rev 0x0025, size 17408
> 
> I find it weird that the Intel release from 2017-11-17 doesn't contain a
> microcode file supposedly released on the same day, but it seems to be the
> case.

Doh, same here, sorry about that, should have checked the microcode
image file myself.

> > I saw a bios update for my Dell laptop dated December 28, but it didn't
> > seem to change anything with the cpuids or microcode status from before.
> 
> Not sure which distribution you use nowadays but Henrique just pushed a
> microcode update to Debian with some collected microcodes:
> 
> https://tracker.debian.org/news/899110
> 
> Obviously it lacks a *lot* of processors (especially pre-Haswell).

I'm running Arch, but it would be nice to know where those microcode
updates came from, given that they aren't on the "official" Intel page
yet :)

> > A hard answer to what "soon" means here would be nice to get, as I'm
> > seeing a lot of misunderstanding floating around right now :(
> 
> Agreed, but I'm not sure who can provide the information.

That's why I'm asking here, hopefully Arjan might have an idea.

thanks,

greg k-h