intel-iommu: Unify hardware and software passthrough support

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This makes the hardware passthrough mode work a lot more like the
software version, so that the behaviour of a kernel with 'iommu=pt'
is the same whether the hardware supports passthrough or not.

In particular:
 - We use a single si_domain for the pass-through devices.
 - 32-bit devices can be taken out of the pass-through domain so that
   they don't have to use swiotlb.
 - Devices will work again after being removed from a KVM guest.
 - A potential oops on OOM (in init_context_pass_through()) is fixed.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

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This commit is contained in:

David Woodhouse 2009-08-04 16:19:20 +01:00

parent 0815565adf

commit 19943b0e30

2 changed files with 76 additions and 103 deletions

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5

arch/x86/kernel/pci-swiotlb.c

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178

drivers/pci/intel-iommu.c

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