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

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH qemu v7 06/14] spapr_iommu: Introduce "enabled" state for TCE table
Date: Tue, 26 May 2015 12:16:57 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

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?



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