iommu/amd: Flushing and locking fixes

From: Filippo Sironi
Date: Tue Sep 10 2019 - 13:50:08 EST

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This patch series introduce patches to take the domain lock whenever we call
functions that end up calling __domain_flush_pages. Holding the domain lock is
necessary since __domain_flush_pages traverses the device list, which is
protected by the domain lock.

The first patch in the series adds a completion right after an IOTLB flush in
attach_device.

Next message: Filippo Sironi: "[PATCH 5/5] iommu/amd: Hold the domain lock when calling domain_flush_tlb[_pde]"
Previous message: Filippo Sironi: "[PATCH 4/5] iommu/amd: Hold the domain lock when calling iommu_map_page"
Next in thread: Filippo Sironi: "[PATCH 1/5] iommu/amd: Wait for completion of IOTLB flush in attach_device"
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