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Re: [Xen-devel] [PATCH 2/2] x86/p2m: adjust non-PoD accounting in p2m_pod_decrease_reservation()
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 21 Feb 2020 14:04:35 +0000
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 21 Feb 2020 14:04:42 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 23/01/2020 11:51, Jan Beulich wrote:
> Throughout the function the equation
>
> pod + nonpod == (1UL << order)
>
> should hold. This has been violated by the final loop of the function:
> * changing a range from a type other than p2m_populate_on_demand to
> p2m_invalid doesn't alter the amount of non-PoD pages in the region,
> * changing a range from p2m_populate_on_demand to p2m_invalid does
> increase the amount of non-PoD pages in the region along with
> decreasing the amount of PoD pages there.
> Fortunately the variable isn't used anymore after the loop. Instead of
> correcting the updating of the "nonpod" variable, however, drop it
> altogether, to avoid getting the above equation to not hold again by a
> future change.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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