From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: perf uncore & lkvm woes
Date: Thu, 16 Aug 2012 08:28:33 -0600
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Cc: Avi Kivity <avi@redhat.com>, Pekka Enberg <penberg@kernel.org>,
	"Yan, Zheng" <zheng.z.yan@linux.intel.com>,
	Sasha Levin <levinsasha928@gmail.com>,
	Asias He <asias.hejun@gmail.com>,
	Cyrill Gorcunov <gorcunov@gmail.com>,
	Ingo Molnar <mingo@elte.hu>, KVM General <kvm@vger.kernel.org>,
	Gleb Natapov <gleb@redhat.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
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On 8/16/12 5:17 AM, Peter Zijlstra wrote:
> If you don't mind printing a warning every time a Linux guest boots ;-)

That feature already exists today for perf related probing. e.g.,

[585929.678746] kvm [10752]: vcpu0 unhandled rdmsr: 0x345
[585929.709870] kvm_set_msr_common: 54 callbacks suppressed
[585929.709986] kvm [10752]: vcpu0 unhandled wrmsr: 0x680 data 0
[585929.710104] kvm [10752]: vcpu0 unhandled wrmsr: 0x6c0 data 0
[585929.710221] kvm [10752]: vcpu0 unhandled wrmsr: 0x681 data 0
[585929.710352] kvm [10752]: vcpu0 unhandled wrmsr: 0x6c1 data 0
[585929.710467] kvm [10752]: vcpu0 unhandled wrmsr: 0x682 data 0
[585929.710581] kvm [10752]: vcpu0 unhandled wrmsr: 0x6c2 data 0
[585929.710707] kvm [10752]: vcpu0 unhandled wrmsr: 0x683 data 0
[585929.710822] kvm [10752]: vcpu0 unhandled wrmsr: 0x6c3 data 0
[585929.710937] kvm [10752]: vcpu0 unhandled wrmsr: 0x684 data 0
[585929.711052] kvm [10752]: vcpu0 unhandled wrmsr: 0x6c4 data 0


David