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iommu/vt-d: Only enable extended context tables if PASID is supported
Although the extended tables are theoretically a completely orthogonal feature to PASID and anything else that *uses* the newly-available bits, some of the early hardware has problems even when all we do is enable them and use only the same bits that were in the old context tables. For now, there's no motivation to support extended tables unless we're going to use PASID support to do SVM. So just don't use them unless PASID support is advertised too. Also add a command-line bailout just in case later chips also have issues. The equivalent problem for PASID support has already been fixed with the upcoming VT-d spec update and commit bd00c606 ("iommu/vt-d: Change PASID support to bit 40 of Extended Capability Register"), because the problematic platforms use the old definition of the PASID-capable bit, which is now marked as reserved and meaningless. So with this change, we'll magically start using ECS again only when we see the new hardware advertising "hey, we have PASID support and we actually tested it this time" on bit 40. The VT-d hardware architect has promised that we are not going to have any reason to support ECS *without* PASID any time soon, and he'll make sure he checks with us before changing that. In the future, if hypothetical new features also use new bits in the context tables and can be seen on implementations *without* PASID support, we might need to add their feature bits to the ecs_enabled() macro. Signed-off-by:David Woodhouse <David.Woodhouse@intel.com>