Re: [Xen-devel] [HYBRID] : mapping IO mems in the EPT

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 15 Jun 2012, Mukesh Rathor wrote:
> Hi guys,
> 
> During my refresh to latest linux, I noticed, direct mapping of all
> non-RAM pages in xen_set_identity_and_release(). I currently don't map
> all at front, but as needed looking at the PAGE_IO bit in the pte. One
> result of that is minor change to common code macro:
> 
>         __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) to
> to        __set_fixmap(idx, phys, PAGE_KERNEL_IO_NOCACHE)
> 
> 
> To avoid this change, and keep all my changes limited to xen files only,
> I thought I could just map the entire non-ram pages up front too. But
> I am concerned the EPT may grow too large? Specially, when we get to 
> *really* large NUMA boxes. What do you guys think? Should I worry about
> it?

I would map them all up front and worry about it later.

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