netdev - Re: [Xen-devel] [PATCH net-next v3 1/9] xen-netback: Introduce TX grant map definitions

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Message-ID: <52CEE91D.50105@citrix.com>
Date:	Thu, 9 Jan 2014 18:23:25 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Wei Liu <wei.liu2@...rix.com>, <jonathan.davies@...rix.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Zoltan Kiss <zoltan.kiss@...rix.com>,
	<xen-devel@...ts.xenproject.org>,
	Roger Pau Monné <roger.pau@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] [PATCH net-next v3 1/9] xen-netback: Introduce TX
 grant map definitions

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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