Re: [Xen-devel] [PATCH] xen/arm: pfn_to_mfn and mfn_to_pfn return the argument if nothing is in the p2m

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-11-11 at 12:50 +0000, Stefano Stabellini wrote:
> Some common Xen drivers, like balloon.c, call pfn_to_mfn and mfn_to_pfn
> even for autotranslate guests, expecting the argument back.
> The following commit broke these drivers by changing the behavior of
> pfn_to_mfn and mfn_to_pfn:
> 
> commit 4a19138c6505e224d9f4cc2fe9ada9188d7100ea
> Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Date:   Thu Oct 17 16:22:27 2013 +0000
> 
>     arm/xen,arm64/xen: introduce p2m
> 
> They now return INVALID_P2M_ENTRY if Linux doesn't actually know what is
> the mfn backing a pfn or what is the pfn corresponding to an mfn.
> Fix the regression by switching to the old behavior.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

I tripped over this on Friday and my local hack was identical, hence
also:

Tested-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Ian.


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