On Tue, Apr 17, 2012 at 09:46:44PM -0600, Alex Williamson wrote: > As pointed out by Jason Baron, when assigning a device to a guest > we first set the iommu domain pointer, which enables mapping > and unmapping of memory slots to the iommu. This leaves a window > where this path is enabled, but we haven't synchronized the iommu > mappings to the existing memory slots. Thus a slot being removed > at that point could send us down unexpected code paths removing > non-existent pinnings and iommu mappings. Take the slots_lock > around creating the iommu domain and initial mappings as well as > around iommu teardown to avoid this race. > > Signed-off-by: Alex Williamson <[email protected]>
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