Re: [Xen-devel] [PATCH v2] xen/arm: p2m: Don't create new table when the mapping is removed

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-12-20 at 01:41 +0000, Julien Grall wrote:
> When  Xen is removing/relinquishing mapping, it will create second/third 
> tables
> if they don't exist.
> 
> Non-existent table means the address range was never mapped, so Xen can safely
> skip them.
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> 
> ---
>     Release: This is an improvement for Xen 4.4. It will save time during
>     relinquish phase and avoid dummy allocation.

(Release: implies it should have been CCd to George)

I would go further than what you say though: This is removing a
potential guest induced long running operation and is therefore a clear
bug fix (and a potential security bug at that). I intend to apply this
(assuming it is OK, I haven't actually read this version yet).

Ian.


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