Re: [Xen-devel] [PATCH v2 for-4.9] x86/mm: Fix incorrect unmapping of 2MB and 1GB pages

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Igor Druzhinin [mailto:igor.druzhinin@xxxxxxxxxx]
> Sent: Wednesday, May 10, 2017 7:13 PM
> 
> The same set of functions is used to set as well as to clean
> P2M entries, except that for clean operations INVALID_MFN (~0UL)
> is passed as a parameter. Unfortunately, when calculating an
> appropriate target order for a particular mapping INVALID_MFN
> is not taken into account which leads to 4K page target order
> being set each time even for 2MB and 1GB mappings. This eventually
> breaks down an EPT structure irreversibly into 4K mappings which
> prevents consecutive high order mappings to this area.
> 
> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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