Re: [Xen-devel] [PATCH 1/3] x86/p2m: tighten conditions of IOMMU mapping updates

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

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Monday, September 21, 2015 10:03 PM
> 
> In the EPT case permission changes should also result in updates or
> TLB flushes.
> 
> In the NPT case the old MFN does not depend on the new entry being
> valid (but solely on the old one), and the need to update or TLB-flush
> again also depends on permission changes.
> 
> In the shadow mode case, iommu_hap_pt_share should be ignored.
> 
> Furthermore in the NPT/shadow case old intermediate page tables must
> be freed only after IOMMU side updates/flushes have got carried out.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

Thanks
Kevin

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