linux-kernel - Re: [PATCH 0/3] PTI for x86-32 Fixes and Updates

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Date:   Wed, 25 Jul 2018 23:47:21 -0400
From:   "David H. Gutteridge" <dhgutteridge@...patico.ca>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>, aliguori@...zon.com,
        daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 0/3] PTI for x86-32 Fixes and Updates

On Mon, 2018-07-23 at 09:29 +0200, Joerg Roedel wrote:
> Hey David,
> 
> On Sun, Jul 22, 2018 at 11:49:00PM -0400, David H. Gutteridge wrote:
> > Unfortunately, I can trigger a bug in KVM+QEMU with the Bochs VGA
> > driver. (This is the same VM definition I shared with you in a PM
> > back on Feb. 20th, except note that 4.18 kernels won't successfully
> > boot with QEMU's IDE device, so I'm using SATA instead. That's a
> > regression totally unrelated to your change sets, or to the general
> > booting issue with 4.18 RC5, since it occurs in vanilla RC4 as
> > well.)
> 
> Yes, this needs the fixes in the tip/x86/mm branch as well. Can you
> that branch in and test again, please?

Sorry, I didn't realize I needed those changes, too. I've re-tested
with those applied and haven't encountered any issues. I'm now
re-testing again with your newer patch set from the 25th. No issues
so far with those, either; I'll confirm in that email thread after
the laptop has seen some more use.

Dave