Re: [PATCH v3 0/7] Enhance PAT init to fix Xorg crashes

From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: "Luis R. Rodriguez" <mcgrof@suse.com>
Cc: Toshi Kani <toshi.kani@hpe.com>,
	lkp@ml01.01.org, "Hao, Xudong" <xudong.hao@intel.com>,
	Paul Gortmaker <paul.gortmaker@windriver.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Olaf Hering <ohering@suse.de>,
	Ingo Molnar <mingo@kernel.org>, X86 ML <x86@kernel.org>,
	Robert Schweikert <rjschwei@suse.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	Borislav Petkov <bp@suse.de>,
	elliott@hpe.com, Charles Arnold <carnold@suse.com>,
	Olaf Hering <olaf@aepfle.de>, Michal Marek <mmarek@suse.cz>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Juergen Gross <jgross@suse.com>, Mike Latimer <mlatimer@suse.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Lars Kurth <lars.kurth@xen.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [PATCH v3 0/7] Enhance PAT init to fix Xorg crashes
Date: Wed, 30 Mar 2016 14:58:33 -0400	[thread overview]
Message-ID: <20160330185833.GA3323@char.us.oracle.com> (raw)
In-Reply-To: <CAB=NE6VZD3gJicAzm3068APmVeKmFdF-gavNjEoVCz51hV262g@mail.gmail.com>

On Wed, Mar 30, 2016 at 11:02:13AM -0700, Luis R. Rodriguez wrote:
> On Tue, Mar 29, 2016 at 8:49 AM, Toshi Kani <toshi.kani@hpe.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

Boris did test it _before_ it was merged.

> 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.

In Fedora you just need to do:

#yum install xen
#reboot
And pick the Xen option. 

Probably the same thing with Debian and Ubuntu - just 'apt-get install xen'

> 
> Its a major undertaking to get Linux Xen guests boot strapped into

It is?

> 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.

Sure. It never hurts to have more coverage.
> 
>  Luis
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

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