Re: [Xen-devel] [PATCH V9 7/7] p2m: change_range_type: Only invalidate mapped gfns

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.11.18 at 12:40, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> change_range_type() invalidates gfn ranges to lazily change the type

Would you mind correcting the function name here?

> of a range of gfns, and also modifies the logdirty rangesets of that
> p2m. At the moment, it clips both down by the hostp2m.
> 
> While this will result in correct behavior, it's not entirely efficient,
> since invalidated entries outside that range will, on fault, simply be
> modified back to "empty" before faulting normally again.
> 
> Separate out the calculation of the two ranges.  Keep using the
> hostp2m's max_mapped_pfn to clip the logdirty ranges, but use the
> current p2m's max_mapped_pfn to further clip the invalidation range
> for alternate p2ms.
> 
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>

Subject to possible adjustments due to changes to patch 6
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Jan



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