linux-kernel - Re: [kvm-devel] [PATCH][RFC] SVM: Add Support for Nested Paging in AMD Fam16 CPUs

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Message-ID: <479C4763.1080104@qumranet.com>
Date:	Sun, 27 Jan 2008 10:57:07 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH][RFC] SVM: Add Support for Nested Paging in
 AMD Fam16 CPUs

Joerg Roedel wrote:
> Hi,                                                                                                                              
>
> here is the first release of patches for KVM to support the Nested Paging (NPT)
> feature of AMD QuadCore CPUs for comments and public testing. This feature
> improves the guest performance significantly. I measured an improvement of
> around 17% using kernbench in my first tests.
>
> This patch series is basically tested with Linux guests (32 bit legacy
> paging, 32 bit PAE paging and 64 bit Long Mode). Also tested with Windows Vista
> 32 bit and 64 bit. All these guests ran successfully with these patches. The
> patch series only enables NPT for 64 bit Linux hosts at the moment.
>   


Very nice patchset; small, simple, and clean.  Apart from the comments I 
already posted, I'd like to avoid the term 'hap': I find it 
non-descriptive, and it reminds me of another hypervisor.  I suggest 
'tlp' for two-level paging.

Since it re-uses non-npt real-mode paging, live migration and swapping 
will likely work without further changes.

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

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