Re: [Xen-devel] [PATCH] x86/pagewalk: Remove opt_allow_superpage check from guest_can_use_l2_superpages()

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Jul 25, 2017 at 04:27:00PM +0100, Tim Deegan wrote:
> At 16:00 +0100 on 25 Jul (1500998413), Andrew Cooper wrote:
> > The purpose of guest_walk_tables() is to match the behaviour of real 
> > hardware.
> > 
> > A PV guest can have 2M superpages in its pagetables, via the M2P and the
> > initial initrd mapping, even if it isn't permitted to create arbitrary 2M
> > superpage mappings.
> 
> Can the domain builder (or Xen?) really give a guest superpage
> mappings for its initrd?  Wouldn't that cause problems for live
> migration?
> 

I can see superpage mapping when constructing Dom0 (kernel or initrd,
haven't checked).

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