Re: [Xen-devel] Baffled by multipage_allocation_permitted()

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 15/06/2009 22:44, "Dave McCracken" <dcm@xxxxxxxx> wrote:

> #define multipage_allocation_permitted(d)   \
>    (!rangeset_is_empty((d)->iomem_caps) || \
>     !rangeset_is_empty((d)->arch.ioport_caps))
> 
> I had never tracked down the significance of this macro since it didn't appear
> to be an issue.  Now it's suddenly denying me the ability to work in 2M pages.
> 
> What is this macro trying to achieve?  Why is it necessary?  Is there any
> compelling reason we can't just remove it and allow multipage allocations from
> any domain?

We can just get rid of it I think. There are arguably worse other things we
already allow, like any guest can allocate low memory by specifying a small
value of XENMEMF_address_bits().

 -- Keir



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