linux-kernel - Re: [PATCH 0/18][RFC] Nested Paging support for Nested SVM (aka NPT-Virtualization)

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Message-ID: <4B94C655.6000504@redhat.com>
Date:	Mon, 08 Mar 2010 11:41:41 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/18][RFC] Nested Paging support for Nested SVM (aka NPT-Virtualization)

On 03/03/2010 09:12 PM, Joerg Roedel wrote:
> Hi,
>
> here are the patches that implement nested paging support for nested
> svm. They are somewhat intrusive to the soft-mmu so I post them as RFC
> in the first round to get feedback about the general direction of the
> changes.  Nevertheless I am proud to report that with these patches the
> famous kernel-compile benchmark runs only 4% slower in the l2 guest as
> in the l1 guest when l2 is single-processor. With SMP guests the
> situation is very different. The more vcpus the guest has the more is
> the performance drop from l1 to l2.
> Anyway, this post is to get feedback about the overall concept of these
> patches.  Please review and give feedback :-)
>
> Thanks,
>
> 	Joerg
>
> Diffstat:
>
>   arch/x86/include/asm/kvm_host.h |   21 ++++++
>   arch/x86/kvm/mmu.c              |  152 ++++++++++++++++++++++++++++++---------
>   arch/x86/kvm/mmu.h              |    2 +
>   arch/x86/kvm/paging_tmpl.h      |   81 ++++++++++++++++++---
>   arch/x86/kvm/svm.c              |  126 +++++++++++++++++++++++++++-----
>   arch/x86/kvm/vmx.c              |    9 +++
>   arch/x86/kvm/x86.c              |   19 +++++-
>   include/linux/kvm.h             |    1 +
>   include/linux/kvm_host.h        |    5 ++
>   9 files changed, 354 insertions(+), 62 deletions(-)
>    

Okay, this looks excellent overall, it's nice to see how well this fits 
with the existing mmu infrastructure (only ~300 lines added).  The 
performance results are impressive.

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

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