[Xen-devel] Re: Hugepages don't work on the Xen Linux git tree

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 04/19/2010 07:27 PM, Dave McCracken wrote:
> The fix I have in older kernels is for set_huge_pte_at() to call set_pmd() 
> instead.  However, in this brave new world of paravirt vectors, should I 
> instead set up a vector for it?  What is the architecturally right thing to 
> do?  However we decide to do it, expect a patch for it shortly afterward.
>   

Yeah, its a bit awkward.  A huge pte is semantically a pte, but
structurally a pmd, so which should it be?  The perhaps "cleanest" fix
might be to add a set of huge pte operators, but I don't think that's
really justified given that this is a fairly specific, narrow case.

I think on balance the best thing is to make set_huge_pte_at() call
set_pmd().

    J


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