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Re: [Xen-devel] [PATCH] Intel/vpmu: Use Intel VPMU quirk on all family 6 processors

On 05/30/2013 05:33 PM, Boris Ostrovsky wrote:
On 05/16/2013 08:30 AM, Jan Beulich wrote:
On 10.05.13 at 11:46, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
On Thu, May 9, 2013 at 9:45 PM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
On 05/09/2013 04:34 PM, Boris Ostrovsky wrote:
Currently only a few Intel models have VPMU workaround turned on. It
appears, however, that this issue exists on more models than what is
covered by check_pmc_quirk(). Since we don't know exactly which cpus
are affected we should turn this workaround on for all family 6


A few weeks ago we had an email thread about this issue
Did you have a chance to clarify with your HW folks what this is?

We kept hitting this on various models which is why I am suggesting
patch (and I think it should be considered for 4.3).
In principle it's a bug fix, and fine for 4.3.  But it would be good
to get some feedback from someone at Intel.
Intel, anyone???

Thanks, Jan

I haven't seen any responses from Intel folks about this issue.

Do we wait for post-4.3?

Our goals at this point:
- Bug-free release
- Awesome release
- On-time release

I take it that the main risk here is that vcpu for some models which would have otherwise worked will not work anymore?

But at his point you *know* many models which don't work without it; so on the whole I'm inclined to say that it's an "accept" on the cost/benefits analysis.


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