Re: [Xen-devel] [PATCH v2 03/11] IOMMU/MMU: enhance the call trees of IOMMU unmapping and mapping

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 18/04/16 15:00, Quan Xu wrote:
> If IOMMU mapping and unmapping failed, the domain (with the exception of
> the hardware domain) is crashed, treated as a fatal error. Rollback can
> be lighter weight.
> 
> For the hardware domain, we do things on a best effort basis. When rollback
> is not feasible (in early initialization phase or trade-off of complexity),
> at least, unmap upon maps error or then throw out 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>

FWIW, looking through this I think Jan and Kevin covered everything I
would have brought up.

 -George


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