linux-kernel - Re: [PATCHv2 2/9] KVM: Expose a version 2 architectural PMU to a guests

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Message-ID: <4EB7F852.9010606@redhat.com>
Date:	Mon, 07 Nov 2011 17:25:06 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, kvm@...r.kernel.org,
	mtosatti@...hat.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	acme@...stprotocols.net
Subject: Re: [PATCHv2 2/9] KVM: Expose a version 2 architectural PMU to a
 guests

On 11/07/2011 05:19 PM, Gleb Natapov wrote:
> > 
> > note, this needs a fairly huge PMI skew to happen.
> > 
> No, it need not. It is enough to get exit reason as hlt instead of nmi
> for a vcpu to go to blocking state instead of reentering guest mode.
> Note that we do not check request flags in kvm_arch_vcpu_runnable().

Right.

If we had a guarantee about the maximum skew, we could add a check for
KVM_REQ_PMI in kvm_vcpu_block().

-- 
error compiling committee.c: too many arguments to function

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