On Wed, 23 Nov 2011 20:36:00 +0000, David Woodhouse <dwmw2@xxxxxxxxxxxxx> wrote: > This is horrid. In the general case, drivers have no business knowing > this. We need to properly identify what is wrong with this hardware, and > put in a quirk for it — perhaps refusing to enable the IOMMU at all on > the broken chipsets. That'd be fine with me, right now we're disabling RC6 and semaphores -- semaphores aren't all that important, although they do improve performance a bit. RC6 is important, saving a huge amount of power. I'd also be OK with requiring special options to enable DMAR and having that also disable RC6/semaphores, if you'd rather expose that. In either case, we need something that works and avoids hanging machines. -- keith.packard@xxxxxxxxx
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