Re: [Qemu-devel] [PATCH v2 06/11] nvdimm acpi: initialize the resource used by NVDIMM ACPI

[Xiao Guangrong]

On 02/18/2016 01:26 AM, Michael S. Tsirkin wrote:
> On Wed, Feb 17, 2016 at 10:04:18AM +0800, Xiao Guangrong wrote:
> > > > > As for the rest could that commands go via MMIO that we usually
> > > > > use for control path?
> > > >
> > > > So both input data and output data go through single MMIO, we need to
> > > > introduce a protocol to pass these data, that is complex?
> > > >
> > > > And is any MMIO we can reuse (more complexer？) or we should allocate this
> > > > MMIO page （the old question - where to allocated?）?
> > > Maybe you could reuse/extend memhotplug IO interface,
> > > or alternatively as Michael suggested add a vendor specific PCI_Config,
> > > I'd suggest PM device for that (hw/acpi/[piix4.c|ihc9.c])
> > > which I like even better since you won't need to care about which ports
> > > to allocate at all.
> >
> > Well, if Michael does not object, i will do it in the next version. :)
>
> Sorry, the thread's so long by now that I'm no longer sure what does "it" refer 
> to.

Never mind i saw you were busy on other loops.

"It" means the suggestion of Igor that "map each label area right after each
NVDIMM's data memory" so we do not emulate it in QEMU and is good for the 
performance
of label these are the points i like. However it also brings 
complexity/limitation for
later DSM commands supports since both dsm input & output need to go through 
single MMIO.

Your idea?