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Date: Tue, 13 Sep 2011 09:52:49 +0300
From: Gleb Natapov <gleb@redhat.com>
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Subject: Re: [Qemu-devel] About hotplug multifunction
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To: Isaku Yamahata <yamahata@valinux.co.jp>
Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>, qemu-devel@nongnu.org, blauwirbel@gmail.com, Alex Williamson <alex.williamson@redhat.com>, Amos Kong <akong@redhat.com>

On Tue, Sep 13, 2011 at 02:57:20PM +0900, Isaku Yamahata wrote:
> On Sun, Sep 11, 2011 at 12:05:17PM +0300, Michael S. Tsirkin wrote:
> > On Sat, Sep 10, 2011 at 02:43:11AM +0900, Isaku Yamahata wrote:
> > > pci/pcie hot plug needs clean up for multifunction hotplug in long term.
> > > Only single function device case works. Multifunction case is broken somwehat.
> > > Especially the current acpi based hotplug should be replaced by
> > > the standardized hot plug controller in long term.
> > 
> > We'll need to keep supporting windows XP, which IIUC only
> > supports hotplug through ACPI. So it looks like we'll
> > need both.
> 
> Yes, we'll need both then.
> It would be possible to implement acpi-based hotplug with
> standardized hotplug controller. Not with qemu-specific controller.
> 
Where is this "standardized hotplug controller" documented?

> It would require a bit amount of work to write ACPI code in DSDT that
> handles standardized hotplug controller.
> So I'm not sure it's worth while only for windows XP support.
> -- 
> yamahata

--
			Gleb.