Re: [Xen-devel] [PATCH v3 for-xen-4.5] xen_disk: fix unmapping of persistent grants

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 11/13/2014 05:42 PM, Roger Pau Monne wrote:
> This patch fixes two issues with persistent grants and the disk PV backend
> (Qdisk):
>
>   - Keep track of memory regions where persistent grants have been mapped
>     since we need to unmap them as a whole. It is not possible to unmap a
>     single grant if it has been batch-mapped. A new check has also been added
>     to make sure persistent grants are only used if the whole mapped region
>     can be persistently mapped in the batch_maps case.
>   - Unmap persistent grants before switching to the closed state, so the
>     frontend can also free them.
>
> Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
> Reported-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Tested-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>


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