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

On April 27, 2016 11:48 PM, George Dunlap <george.dunlap@xxxxxxxxxx> wrote:
> 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, thanks for your attention. Your comments as always are greatly 
appreciated too. :)

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