Re: [Xen-devel] Future support of 5-level paging in Xen:wq

["Zhang, Xiong Y" <xiong.y.zhang@xxxxxxxxx>]

> > From: Li, Liang Z
> > Sent: Tuesday, December 13, 2016 11:58 AM
> >
> > Hi All,
> >
> > We are now working on enabling 5 level paging & 5 level EPT for XEN. We need
> the
> > community's opinions about the following aspects:
> >
> > 1.  Should we enable 5 level paging for PV guest ? (You are discussing)
> > 2.  Should we make the 5 level paging and 4 level paging supported with one
> binary?
[Zhang, Xiong Y] If we plan to enable 5 level paging at runtime, we have to 
reconstruct xen mm code first as some constants (especially in 
asm-x86/config.h) are defined static for 4 level paging and are used before 
__start_xen.
If we plan to enable 5 level paging with separate binary, things will be much 
easier with CONFIG option. 

> > 3.  When should the 5 level EPT be enabled?
> 
> Isn't it as usual i.e. let's enable once the spec is published? Or could you
> elaborate any concern of asking this question?
> 
> > 4. Should we extend shadow page to support 5 level paging guest?
> >
> 
> I don't think so. EPT has been there for so many years. We can assume
> EPT available on new platform which supports 5-level.
> 
> Thanks
> Kevin
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