Re: [Qemu-devel] [PATCH qemu v7 06/14] spapr_iommu: Introduce "enabled" state for TCE table

[Paolo Bonzini]

On 26/05/2015 12:15, Alexey Kardashevskiy wrote:
> There was a "[RFC PATCH 00/15] spapr: add support for PHB hotplug"
> patchset from Mike, this patch added "unrealize" for spapr_phb:
> 
> [RFC PATCH 05/15] spapr_pci: add PHB unrealize
> 
> I believe I am dealing with the fixed version of this patch so I'll ask
> Mike to respin it.
> 
> 
>>
>>> 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.
>>
>> The difference is that containers and aliases are resolved at the time
>> the memory region tree is flattened, while IOMMU regions are resolved
>> at run time.
> 
> So they are not parts of flattened view and I should be able to
> add/remove these IOMMU subregions any time I like?

Yes.

Paolo