Messages in this thread | | | Date | Fri, 6 Jul 2018 17:13:21 +0200 | From | Joerg Roedel <> | Subject | Re: [RFC 0/3] iommu/iova: Unsafe locking in find_iova() |
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On Fri, Jul 06, 2018 at 03:10:47PM +0100, Dmitry Safonov wrote: > Yes, as far as I can see, there are code-paths which may try to handle > it at the same time: > o memory notifiers for hot-unplug (intel-iommu.c) > o drivers unloading calls free_iova(), which in the result calls > find_iova() > o I see at least one driver that frees iova during it's normal work > too: scif_rma.c:scif_free_window_offset()
Yeah, but the IOVAs freed in the memory notifiers are just the ones for the direct-mapped RMRR regions requested by firmware, not the IOVAs allocated by any driver, so I think this shouldn't be a problem.
Regards,
Joerg
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