On Tue, Oct 23, 2012 at 03:35:27PM +0200, Andi Kleen wrote:
> > So I forgot how all this worked, but will the KVM emulation not pass
> > this straight down to the hardware?
>
> Pass down to perf.
>
> >
> > Don't we have a problem where we're emulating arch perfmon v1 on AMD
> > hardware? On
> So I forgot how all this worked, but will the KVM emulation not pass
> this straight down to the hardware?
Pass down to perf.
>
> Don't we have a problem where we're emulating arch perfmon v1 on AMD
> hardware? On AMD hardware those bits do have meaning.
Ah they do? I wasn't aware. I can
On Tue, Oct 23, 2012 at 02:36:05PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
> > From: Andi Kleen
> >
> > This is not arch perfmon, but older CPUs will just ignore it. This makes
> > it possible to do at least some TSX measurements from a KVM guest
>
>
On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
> From: Andi Kleen
>
> This is not arch perfmon, but older CPUs will just ignore it. This makes
> it possible to do at least some TSX measurements from a KVM guest
Please, always CC people who wrote the code as well, in this case that's
Gleb.
On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
From: Andi Kleen a...@linux.intel.com
This is not arch perfmon, but older CPUs will just ignore it. This makes
it possible to do at least some TSX measurements from a KVM guest
Please, always CC people who wrote the code as well, in this
On Tue, Oct 23, 2012 at 02:36:05PM +0200, Peter Zijlstra wrote:
On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
From: Andi Kleen a...@linux.intel.com
This is not arch perfmon, but older CPUs will just ignore it. This makes
it possible to do at least some TSX measurements from a KVM
So I forgot how all this worked, but will the KVM emulation not pass
this straight down to the hardware?
Pass down to perf.
Don't we have a problem where we're emulating arch perfmon v1 on AMD
hardware? On AMD hardware those bits do have meaning.
Ah they do? I wasn't aware. I can add a
On Tue, Oct 23, 2012 at 03:35:27PM +0200, Andi Kleen wrote:
So I forgot how all this worked, but will the KVM emulation not pass
this straight down to the hardware?
Pass down to perf.
Don't we have a problem where we're emulating arch perfmon v1 on AMD
hardware? On AMD hardware
From: Andi Kleen
This is not arch perfmon, but older CPUs will just ignore it. This makes
it possible to do at least some TSX measurements from a KVM guest
Cc: a...@redhat.com
v2: Various fixes to address review feedback
Signed-off-by: Andi Kleen
---
arch/x86/kvm/pmu.c | 15 +++
From: Andi Kleen a...@linux.intel.com
This is not arch perfmon, but older CPUs will just ignore it. This makes
it possible to do at least some TSX measurements from a KVM guest
Cc: a...@redhat.com
v2: Various fixes to address review feedback
Signed-off-by: Andi Kleen a...@linux.intel.com
---
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