Re: [Xen-devel] Re: [PATCH 2/2] Linux support for hugepages as a Xen PV guest

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Dave McCracken wrote:
> For starters, Xen currently does remove PSE from the CPUID it returns to the 
> guest.  I'll add some code to allow PSE when hugepages are enabled.
>   
Yep.

> Second, in Linux for the x86_64 architecture the macro to check for PSE is 
> hard-wired to always be true.
>   
Not in current kernels.

> Third, hugepages in Linux makes no check whatsoever for the presence or 
> absence of PSE.  It assumes it's there.
>   
Not in current kernels.  But it does assume that if PSE is present, then 
physical memory can always be mapped with large pages.
> I'll look into the simplest way to make the various Linux parts obey the PSE 
> flag properly.
>   
No, use a current mainline git linux kernel.

   J

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