linux-kernel - Re: [Xen-devel] [PATCH v3 0/7] Enhance PAT init to fix Xorg crashes

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Message-ID: <CAB=NE6VZD3gJicAzm3068APmVeKmFdF-gavNjEoVCz51hV262g@mail.gmail.com>
Date:	Wed, 30 Mar 2016 11:02:13 -0700
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Toshi Kani <toshi.kani@....com>,
	Fengguang Wu <fengguang.wu@...el.com>, lkp@...ts.01.org
Cc:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Juergen Gross <jgross@...e.com>, Olaf Hering <olaf@...fle.de>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	xen-devel <xen-devel@...ts.xenproject.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...e.de>, elliott@....com,
	Lars Kurth <lars.kurth@....org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Olaf Hering <ohering@...e.de>,
	Robert Schweikert <rjschwei@...e.com>,
	"Hao, Xudong" <xudong.hao@...el.com>,
	Michal Marek <mmarek@...e.cz>,
	Mike Latimer <mlatimer@...e.com>,
	Charles Arnold <carnold@...e.com>
Subject: Re: [Xen-devel] [PATCH v3 0/7] Enhance PAT init to fix Xorg crashes

On Tue, Mar 29, 2016 at 8:49 AM, Toshi Kani <toshi.kani@....com> wrote:
> On Tue, 2016-03-29 at 10:46 -0400, Boris Ostrovsky wrote:
>> On 03/29/2016 10:19 AM, Toshi Kani wrote:
>> > On Tue, 2016-03-29 at 12:34 +0200, Ingo Molnar wrote:
>> >
>> > > > I'd appreciate if someone can test this patch-set on Xen to verify
>> > > > that there is no change in "x86/PAT: Configuration [0-7] .."
>> > > > message in dmesg.
>> > > So I don't have a Xen setup, but hopefully such testing will happen
>> > > once these changes show up in linux-next, tomorrow or so.
>> > I will address if any issue is found in testing.
>>
>> I ran a subset of out nightly test. Nobody died.
>>
>> So this all looks good. (It actually may have also fixed another bug
>> that was reported recently by Olaf, copied here)
>
> Cool! Thanks Boris!

Hoping Boris or someone on the Xen front would test this prior to
merging helps but it also slows us down, a while ago we discussed the
possibility of getting Linux Xen guests automatically tested as part
of 0-day, this way then when a developer (in this case Toshi) pushes
to his own tree, he'd be able to just sit and wait for the results,
without having to hope Boris or someone goes out and tests.

Its a major undertaking to get Linux Xen guests boot strapped into
0-day, however such prospects were raised a while ago and it seems we
may be able to get there. Just wanted to send a reminder about this
possibility, and highlight this patch set as an ideal candidate where
a proactive test could have helped as well. I proactively caught the
original Xen issue, but git logs shows we are not doing so great in
this area, so any help on the Xen side as well to help with 0-day
integration would be appreciated.

I'll follow up on another thread on that.

 Luis