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Date:	Thu, 19 Jun 2014 16:39:57 +0200
From:	Paolo Bonzini <>
To:	Andi Kleen <>,
	Eric Northup <>
CC:	Peter Zijlstra <>,,
	Stephane Eranian <>,
	KVM <>,
	Linux Kernel Mailing List <>,
	Andi Kleen <>
Subject: Re: [PATCH 4/4] kvm: Implement PEBS virtualization

Il 02/06/2014 21:57, Andi Kleen ha scritto:
> > It would be a bigger concern if we expected virtual PMU migration to
> > work, but I think it would be nice to update kvm_pmu_cpuid_update() to
> > notice the presence/absence of the new CPUID bits, and then store that
> > into per-VM kvm_pmu->pebs_allowed rather than relying only on the
> > per-host perf_pebs_virtualization().
> I hope at some point it can work. There shouldn't be any problems
> with migrating to the same CPU model, in many cases (same event
> and same PEBS format) it'll likely even work between models or
> gracefully degrade.

The code is there in both kernel and QEMU, it's just very little tested.

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