Re: [Xen-devel] Remapping memory in a HVM DomU from one pfn to another?

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 9/6/08 13:52, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> I think I need to do the following:
> 
> 1. Allocate a page of memory from the 'non-paged pool'
> 2. Get the pfn of the memory I allocated (src pfn), and the pfn of where
> I want to remap the memory to (dst pfn)
> 3. Get the mfn(?) of the memory currently mapped to the src pfn
> 4. Tell Xen to remap the mfn to the dst pfn
> 
> Can this be done? Any tips on the calls I need to make to do it? From a
> quick look through the include files it kind of looks like I could use
> XENMEM_translate_gpfn_list to get the mfn from the pfn, but I don't know
> if that does what I want to do and I don't know where to go from
> there... any suggestions?

XENMEM_exchange. Look at 'struct xen_memory_exchange' in
xen/include/public/memory.h. Note that GMFN means PFN for an HVM guest.
Hopefully it is all self-explanatory enough.

 -- Keir



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