Messages in this thread | | | Date | Thu, 9 Jan 2014 18:23:25 +0000 | From | David Vrabel <> | Subject | Re: [Xen-devel] [PATCH net-next v3 1/9] xen-netback: Introduce TX grant map definitions |
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On 09/01/14 18:09, Stefano Stabellini wrote: > > I agree, but I think that we have different views on the use case. > To me the m2p_override use case is "everywhere an mfn_to_pfn translation > is required", that unfortunately is potentially everywhere at this time.
mfn_to_pfn() cannot be made to work correctly with foreign MFNs. It's a fundamentally unsolvable problem.
IMO, the only sensible use of the m2p_override is to cause mfn_to_pfn() to BUG() if a foreign MFN is used.
David
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