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Re: [Xen-devel] Need help in debugging partially blocked hypervisor

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Need help in debugging partially blocked hypervisor
From: Haitao Shan <maillists.shan@xxxxxxxxx>
Date: Mon, 2 Nov 2009 09:12:11 +0800
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, haitao.shan@xxxxxxxxx, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
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References: <200910301320.40125.dietmar.hahn@xxxxxxxxxxxxxx> <C7109568.18E0D%keir.fraser@xxxxxxxxxxxxx>
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Can I know how you enabled vPMU on Nehalem? This is not supported in
current Xen.

Concerning vpmu support, I totally agree that we can disable this
feature by default. If anyone really wants to use it, he can use boot
options to turn it on. I am preparing a patch for that. And I will
send a patch to enable NHM vpmu together.

For the problem that Dietmar met, I think I once met this before. Can
you add some code in vpmu_do_interrupt that sets the counter you are
using to a value other than zero? Please let me know if that can help.

Best Regards
Shan Haitao

2009/10/30 Keir Fraser <keir.fraser@xxxxxxxxxxxxx>:
> On 30/10/2009 12:20, "Dietmar Hahn" <dietmar.hahn@xxxxxxxxxxxxxx> wrote:
>> I searched the intel processor spec but couldn't find any help.
>> So my questions is, what is wrong here?
>> Can anybody with more knowledge point me in the right direction, what can I
>> still
>> do to find the real cause of this?
> You should probably Cc one of the Intel guys who implemented this stuff --
> I've added Haitao Shan.
> Meanwhile I'd be interested to know whether things work okay for you, minus
> performance counters and the hypervisor hang, if you return immediately from
> vpmu_initialise(). Really at minimum we need such a fix, perhaps with a boot
> paremeter to re-enable the feature, for 3.4.2 release; allowing guests to
> hose the hypervisor like this is of course not on.
>  -- Keir
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