Re: [Xen-devel] [PATCH RFC] Remove PV superpage support (v1).

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Jan 29, 2016 at 09:00:15AM -0700, Jan Beulich wrote:
> >>> On 29.01.16 at 16:30, <konrad.wilk@xxxxxxxxxx> wrote:
> > I am hoping the maintainers can guide me in how they would like:
> >  - Deal with documentation? I removed the allowsuperpage from documentation
> >    but perhaps it should just mention deprecated?
> 
> Since you delete the option, deleting it from doc seems fine to me.
> 
> >  - I left put_superpage as put_page_from_l2e calls it - but I can't see
> >    how the _PAGE_PSE bit would be set as you won't be able to even
> >    put that bit on (after my patch). Perhaps just make it an
> >    ASSERT in put_page_from_l2e?
> 
> No, that can't be done. Did you check why it is the way it is
> (having to do with the alternative initial P2M placement, which
> does use superpages despite the guest itself not being able to
> create any)?

If I recall - this was done for P2M array when put in a different virtual
address space? And this being only the initial domain - would this ..
Oh this can be done for normal guests as well I presume?

Time to dig in this a bit more.

> Jan
> 

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