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

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Date:	Fri, 25 Jan 2008 15:32:57 -0600
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Avi Kivity <avi@...ranet.com>, 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.
>
> Please give these patches a good and deep testing. I hope we have this patchset
> ready for merging soon.
>   

A quick sniff test and things look pretty good.  I was able to start 
running the install CDs for 32-bit and 64-bit Ubuntu, 32-bit OpenSuSE, 
64-bit Fedora, and 32-bit Win2k8.  I'll do a more thorough run of 
kvm-test on Monday when I have a better connection to my machine.

Nice work!

Regards,

Anthony Liguori

> Joerg
>
> Here is the diffstat:
>
>  arch/x86/kvm/mmu.c         |   81 +++++++++++++++++++++++++++++++++++---
>  arch/x86/kvm/mmu.h         |    6 +++
>  arch/x86/kvm/svm.c         |   94 +++++++++++++++++++++++++++++++++++++++++--
>  arch/x86/kvm/vmx.c         |    7 +++
>  arch/x86/kvm/x86.c         |    1 +
>  include/asm-x86/kvm_host.h |    4 ++
>  6 files changed, 182 insertions(+), 11 deletions(-)
>
>
>
>
>
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