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Re: [Xen-devel] About shadow paging

  • To: "Yu Ke" <mr.yuke@xxxxxxxxx>
  • From: yushang <yusunn@xxxxxxxxx>
  • Date: Mon, 6 Oct 2008 08:58:33 +0800
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sun, 05 Oct 2008 17:59:00 -0700
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Thanks for your explanation . I am reading Xen source code now and trying to understand the main logic ,  for this purpose , shadow paging functionality is not so important for me .
thank you anyway.

2008/10/5 Yu Ke <mr.yuke@xxxxxxxxx>
This statement may be true for DomU, but it is not true for HVM
domain, since shadow paging is the default choice for HVM domain
memory virtualization when hardware assisted memory virtualization
(e.g Intel EPT or AMD NPT) is not ready. so the shadow paging is very
critical to HVM domain performance.

Actually you can see community put much effort in the shadow paging
optimization, and shadow2/shadow3 are treated as important feature at
Xen 3.x.x release. (please see Xen release note for detail)

Best Regards

2008/10/5 yushang <yusunn@xxxxxxxxx>:
> Hi ,
> Can someone clarify this for me : shadow paging is for other purpose (for
> example , VM migration ,I think) ,
> it is not the critical component for Xen functionality , right ?
> Many thanks
> yushang
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