On Wed, 2015-04-01 at 14:39 +0100, Will Deacon wrote: > We'd also need to update any page-table code that relies on being called > one page at a time (i.e. the new io-pgtable stuff we merged for 4.0) so > that we iterate over the requested range.
Ick. I hadn't noticed we'd entrenched that mistake even harder. It certainly *wasn't* that hard to fix it... > That shouldn't be too difficult (i.e. just inline the iommu_map logic > into each driver), but it would need some testing. Good. > In fact, that would also allow us to nuke the whole TLB on VFIO unmap of > large ranges. We currently iterate over the range page-by-page, which takes > ages (minutes) in simulation. Which is one of the big reasons we lie about page sizes in VT-d. -- dwmw2
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