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

Anthony Liguori
2008-01-25T21:33:01Z

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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