Re: Questing regarding KVM Guest PMU

[shashank rachamalla <shashank.rachamalla@xxxxxxxxx>]

On Thu, Apr 5, 2012 at 8:11 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote:
> On Thu, Apr 05, 2012 at 05:38:40PM +0300, Avi Kivity wrote:
>> On 04/05/2012 04:57 PM, Gleb Natapov wrote:
>> > > >
>> > > May be it used NMI based profiling. We should ask oprofile developers.
>> > > As I said I am almost sure my inability to run it on a host is probably
>> > > PEBKAC, although I ran the same script exactly on the host and the
>> > > guest (the script is from the first email of this thread)
>> > >
>> > After upgrading the kernel to latest git from whatever it was there the
>> > same script works and counts CPU_CLK_UNHALT events.
>> >
>>
>> This is even while it violates the Intel guidelines?
>>
> Yes, but who says the result is correct :) It seems that we handle
> global ctrl msr wrong. That is counter can be enabled either in global
> ctrl or in eventsel. Trying to confirm that.
>
if that becomes true then will global ctrl msr have any significance ?
> --
>                        Gleb.
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