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xen-devel
RE: [Xen-devel] PV guest + shadow paging
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To: |
"Jeremy Fitzhardinge" <jeremy@xxxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] PV guest + shadow paging |
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From: |
"Nakajima, Jun" <jun.nakajima@xxxxxxxxx> |
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Date: |
Wed, 24 Oct 2007 13:39:35 -0700 |
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Cc: |
Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Levin Johnson <levin.johnson@xxxxxxxxx> |
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Wed, 24 Oct 2007 13:40:13 -0700 |
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AcgWcA2amaQEQrkAROe+VFJQmg7+iwADZYTA |
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Thread-topic: |
[Xen-devel] PV guest + shadow paging |
Jeremy Fitzhardinge wrote:
> Keir Fraser wrote:
> > On 24/10/07 11:00, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:
> >
> >
> > > Tim Deegan wrote:
> > >
> > > > The joy of NPT(VMI?)/EPT is that you don't need shadow
pagetables at
> > > > all. :)
> > > >
> > > >
> > > Sure, but from a guest interface perspective they look the same.
> > >
> >
> > Would you want to take advantage of NPT/EPT once you've pv'ed your
mmu
> > interfaces?
> >
>
> I think so. NPT/EPT would seem to have all the advantages of shadow
> paging and direct paging without the disadvantages. We would avoid
> taking faults/hypercalls on pagetable updates, and have the secondary
> benefit of not needing to worry about page permissions on pagetables,
> making it easier to use superpages for the kernel and in general.
> Perhaps the initial implementations will be sufficiently poor that it
> isn't worth doing now, but I think it will in time.
>
> J
Well, then you need to run those in HVM domains ;-)
Jun
---
Intel Open Source Technology Center
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