linux-kernel - Re: [kvm-devel] [PATCH 3/8] SVM: add module parameter to disable NestedPaging

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Message-ID: <20080126072556.GB21476@8bytes.org>
Date:	Sat, 26 Jan 2008 08:25:56 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	"Nakajima, Jun" <jun.nakajima@...el.com>
Cc:	Joerg Roedel <joerg.roedel@....com>, Avi Kivity <avi@...ranet.com>,
	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH 3/8] SVM: add module parameter to disable NestedPaging

On Fri, Jan 25, 2008 at 05:47:11PM -0800, Nakajima, Jun wrote:
> Joerg Roedel wrote:
> > To disable the use of the Nested Paging feature even if it is
> available in
> > hardware this patch adds a module parameter. Nested Paging can be
> disabled by
> > passing npt=off to the kvm_amd module.
> 
> I think it's better to use a (common) parameter to qemu. That way you
> can control on/off for each VM.

Generally I see no problem with it. But at least for NPT I don't see a
reason why someone should want to disable it on a VM basis (as far as it
works stable). Avi, what do you think?

Joerg
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