Re: [Qemu-devel] [RFC PATCH qemu 2/4] memory: Prepare for shared flat views

[David Gibson]

On Thu, Sep 07, 2017 at 07:20:08PM +1000, Alexey Kardashevskiy wrote:
> We are going to share flat views and dispatch trees between address
> spaces. This moves bits around but no change in behaviour is expected
> here. The following patch will implement sharing.
> 
> This switches from AddressSpace to AddressSpaceDispatch as in many
> places this is what is used actually. Also, since multiple address
> spaces will be sharing a flat view, MemoryRegionSection cannot store
> the address space pointer, this changes it to AddressSpaceDispatch
> as well. As a not very obvious result, IOMMUTLBEntry also switched
> from AddressSpace to AddressSpaceDispatch to make
> address_space_get_iotlb_entry() work.

So, mostly this seems to be exposing AddressSpaceDispatch in more
places.  It's not obvious to me why that's useful.

-- 
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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