On Tue, May 26, 2015 at 01:05:56AM +1000, Alexey Kardashevskiy wrote: > Hi Paolo, > > I have had a conversation with Mike and it turns out I am not allowed to > create/remove memory regions dynamically (docs/memory.txt:101); otherwise > "destroying regions during reset causes assertion in RCU thread during > PHB/IOMMU unplug/unparent". Is it because patch just missing some > unref()/unparent() call or it is totally wrong and I have to implement > subregions (on a PCI bus address space) myself if I want dynamic DMA > windows? Thanks!
So, the sentences after that one note an exception for alias and
container regions. I think iommu regions should behave similarly - in
a sense they're just a procedurally generated collection of alias
regions.
If it's not true now that they can be unparented at any time like
alias regions, we should probably try to make it true.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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