linux-kernel - Re: KVM timekeeping fixes, V2

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Message-ID: <20100716192637.GK23755@8bytes.org>
Date:	Fri, 16 Jul 2010 21:26:37 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Zachary Amsden <zamsden@...hat.com>
Cc:	KVM <kvm@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Glauber Costa <glommer@...hat.com>,
	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: KVM timekeeping fixes, V2

On Fri, Jul 16, 2010 at 07:20:32AM -1000, Zachary Amsden wrote:

> I've been very careful to keep nested SVM safe, but I've not got a good
> test for that.  Is there any test suite for the nested case?

To test this you can boot a nested Linux guest and let both, L1 and L2
guest use kvm_clock. Then put some load into the L2 guest and see if the
L2 or the L1 freezes hard (which happens with kvm_clock when the TSC
went backwards for one of them).

	Joerg

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