Re: [Xen-devel] [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running on bare metal

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Mar 21, 2013 at 03:39:57PM +0100, Stefan Bader wrote:
> On 21.03.2013 15:07, Konrad Rzeszutek Wilk wrote:
> > On Wed, Mar 13, 2013 at 09:44:43AM -0400, Josh Boyer wrote:
> >> On Wed, Mar 13, 2013 at 09:25:44AM -0400, Boris Ostrovsky wrote:
> >>> On 03/01/2013 07:14 AM, Josh Boyer wrote:
> >>>> On Thu, Feb 28, 2013 at 04:52:20PM -0800, H. Peter Anvin wrote:
> >>>>> On 02/28/2013 04:42 PM, Josh Boyer wrote:
> >>>>>> On Fri, Mar 01, 2013 at 01:36:29AM +0100, Borislav Petkov wrote:
> >>>>>>> On Thu, Feb 28, 2013 at 04:15:45PM -0800, H. Peter Anvin wrote:
> >>>>>>>>> I'll try to get someone to test this tomorrow.
> >>>>>>> Btw, you'd need to apply that other patch too
> >>>>>>>
> >>>>>>> http://marc.info/?l=xen-devel&m=136206183814547&w=2
> >>>>>>>
> >>>>>>> so that arch_flush_lazy_mmu_mode() has at least one caller on x86_64.
> >>>>>> Yeah, we already have that applied.  It stops crashes in xen
> >>>>>> environments so we pulled it in as a bugfix.  Thanks though!
> >>>>>>
> >>>>> Who are "we"?
> >>>> Sorry, Fedora.  That patch has a link to a bug in it.  We applied the
> >>>> patch for that bug.  I'll apply Boris' patch on top and get the same
> >>>> people to test it.
> >>>
> >>> Josh, have you had a chance to test this?
> >>
> >> I've tested it on bare metal for a while now.  No problems noticed at
> >> all.  I've not heard back from Krishna who was testing it in the Xen
> >> environment.  Krishna?
> > 
> > Roping in Stephan from Canonical as they are seeing it on a regular basis
> > and is affecting their distro.
> 
> That is unfortunately overstated. Just was asked about it by someone who seems
> affected and who had found the redhat bug. From that I found the other thread
> (which added the lazy_mmu_flush).
> Well, I passed on the link to this thread so maybe this will get some 
> confirmation.

Aaah. Sorry for that.
> 
> > 
> > Stephan - there are two patches for it - the paravirt of lazy_mmu mode
> > and then the other one.
> > 
> > This thread should provide the right URLs (I hope). Could you (if it is 
> > possible)
> > try them out and see if they fix the issue?
> > 
> >>
> >> josh
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
> > 
> 
> 



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