From: Peter Zijlstra <peterz@infradead.org>
To: Avi Kivity <avi@redhat.com>
Cc: Jes Sorensen <Jes.Sorensen@redhat.com>,
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
kvm@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Fr??d??ric Weisbecker <fweisbec@gmail.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Lin Ming <ming.m.lin@intel.com>,
Sheng Yang <sheng@linux.intel.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
oerg Roedel <joro@8bytes.org>, Gleb Natapov <gleb@redhat.com>,
Zachary Amsden <zamsden@redhat.com>,
zhiteng.huang@intel.com, tim.c.chen@intel.com
Subject: Re: [PATCH V2 1/5] ara virt interface of perf to support kvm guest os statistics collection in guest os
Date: Tue, 22 Jun 2010 12:10:28 +0200 [thread overview]
Message-ID: <1277201428.1875.696.camel@laptop> (raw)
In-Reply-To: <4C208B09.9030003@redhat.com>
On Tue, 2010-06-22 at 13:06 +0300, Avi Kivity wrote:
> You have a set of MSRs for real hardware (actually several sets)
> discoverable by cpuid bits. You have another set of MSRs, using other
> indexes, discoverable by more CPUID bits.
>
> The new MSR indexes will always #GP on real hardware, but will be
> trapped and serviced by kvm. In effect kvm will pretend to have a
> hardware-like PMU but done according to its own specifications.
So what's the point? I thought the whole MSR interface thing was purely
to let other-o$ play with the PMU, but if you move it around like that
and make it KVM specific, nobody will find it...
next prev parent reply other threads:[~2010-06-22 10:10 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-21 9:31 [PATCH V2 1/5] ara virt interface of perf to support kvm guest os statistics collection in guest os Zhang, Yanmin
2010-06-21 11:45 ` Avi Kivity
2010-06-22 1:49 ` Zhang, Yanmin
2010-06-22 7:14 ` Jes Sorensen
2010-06-22 7:47 ` Zhang, Yanmin
2010-06-22 7:55 ` Peter Zijlstra
2010-06-22 8:00 ` Jes Sorensen
2010-06-22 9:29 ` Zhang, Yanmin
2010-06-22 9:31 ` Peter Zijlstra
2010-06-22 9:39 ` Jes Sorensen
2010-06-22 9:46 ` Peter Zijlstra
2010-06-22 9:53 ` Avi Kivity
2010-06-22 10:02 ` Peter Zijlstra
2010-06-22 10:06 ` Avi Kivity
2010-06-22 10:10 ` Peter Zijlstra [this message]
2010-06-22 11:01 ` Avi Kivity
2010-06-22 7:58 ` Jes Sorensen
2010-06-23 1:13 ` Zhang, Yanmin
2010-06-23 8:15 ` Jes Sorensen
2010-06-22 8:59 ` Avi Kivity
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