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

[Stefan Bader <stefan.bader@canonical.com>]

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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.

> 
> 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
> 
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> 



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