Re: [Xen-devel] [PATCH v7 02/11] IOMMU/MMU: enhance the call trees of IOMMU unmapping and mapping

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

> From: Xu, Quan
> Sent: Wednesday, June 08, 2016 4:59 PM
> 
> From: Quan Xu <quan.xu@xxxxxxxxx>
> 
> When IOMMU mapping is failed, we issue a best effort rollback, stopping
> IOMMU mapping, unmapping the previous IOMMU maps and then reporting the
> error up to the call trees. When rollback is not feasible (in early
> initialization phase or trade-off of complexity) for the hardware domain,
> we do things on a best effort basis, only throwing out an error message.
> 
> IOMMU unmapping should perhaps continue despite an error, in an attempt
> to do best effort cleanup.
> 
> Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
> 

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

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