Re: [Xen-devel] [PATCH 1/2] IOMMU/MMU: Adjust top level functions for VT-d Device-TLB flush error.

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Fri, 2016-03-18 at 03:29 -0600, Jan Beulich wrote:
> > 
> Not sure what exactly you're asking for: As said, we first need to
> settle on an abstract model. Do we want IOMMU mapping failures
> to be fatal to the domain (perhaps with the exception of the
> hardware one)? I think we do, and for the hardware domain we'd
> do things on a best effort basis (always erring on the side of
> unmapping). Which would probably mean crashing the domain
> could be centralized in iommu_{,un}map_page(). How much roll
> back would then still be needed in callers of these functions for
> the hardware domain's sake would need to be seen.
> 
> So before you start coing, give others (namely but not limited to
> VT-d, AMD IOMMU, other x86, and x86/mm maintainers) a chance
> to voice differing opinions.
>
I'm nothing of the above but, FWIW, the behavior Jan described
(crashing the domain for all domains but the hardware domain) was
indeed the intended plan for this series, as far as I understood from
talking to people and looking at previous email conversations and
submissions.

And it looks to me like it is a sane plan.

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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