Re: [Xen-devel] [PATCH 7 of 7] x86/mm: When removing/adding a page from/to the physmap, keep in mind it could be shared

[Tim Deegan <tim@xxxxxxx>]

At 00:45 -0500 on 09 Feb (1328748352), Andres Lagar-Cavilla wrote:
> When removing the m2p mapping it is unconditionally set to invalid, which
> breaks sharing.
> 
> When adding to the physmap, if the previous holder of that entry is a shared
> page, we unshare to default to normal case handling.
> 
> And, we cannot add a shared page directly to the physmap. Proper interfaces
> must be employed, otherwise book-keeping goes awry.
> 
> Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>

Acked-by: Tim Deegan <tim@xxxxxxx>

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