On Fri, 2011-11-11 at 16:45 -0800, Chris Wright wrote: > > So if you were to ditch the whole idea of a per-domain runtime update, > > and instead calculate a global value for 'iommu_coherency' at boot time, > > by iterating over for_each_active_iommu()¹, I think that would be a > > better way to deal with the issue. And you *could* really call that a > > 'fix'. > > > > Make sense? > > Ideally, yes. Not sure we can practically do it though. Would have to > be sure we force incoherent access mode for the busted hw. Why's it not practical? You do the *same* loop we currently have in domain_update_iommu_coherency(), except that you do it just *once*, over all active IOMMUs, at boot time. And then you just use that result forever more. So if *any* IOMMU in the system is non-coherent, you run them all that way. -- dwmw2
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