Re: [Qemu-devel] [PATCH 4/5] memory: interface to allocate device ram

[Michael S. Tsirkin]

On Mon, Nov 17, 2014 at 08:21:00PM +0000, Peter Maydell wrote:
> On 17 November 2014 20:08, Michael S. Tsirkin <address@hidden> wrote:
> > Add API to allocate on-device RAM.
> > This looks just like regular RAM from migration POV,
> > but has two special properties internally:
> >  - it is never exposed to guest
> 
> If it's not exposed to the guest why is it a MemoryRegion?
> Those are pretty much the definition of regions of memory
> we expose to the guest (via one address space or another)...
> 
> -- PMM

Mostly for migration: we are using page migration machinery to
migrate this memory early rather than as part of device state
after VM is stopped.

-- 
MST