Re: [Qemu-devel] [PATCH rebased for-1.8] i386: pc: align gpa<->hpa on 1GB boundary (v6)

[Michael S. Tsirkin]

On Wed, Dec 11, 2013 at 04:41:08PM +0100, Paolo Bonzini wrote:
> Il 11/12/2013 16:39, Michael S. Tsirkin ha scritto:
> > > 2GB low memory for q35 is a bit wasteful,
> > > but we have some time to fix that before release.
> > 
> > How would you fix that?
> 
> Just use 1GB, coupled with reducing the default MMCONFIG size to 128
> buses.
> That's already ~40 PCIe devices

This is not really enough, people requested more than 40 devices.
We will likely need multiroot down the road because some people want
more than 256 devices ...

> if you count upstream/downstream
> ports in addition to the actual device, and you can also use PCIe-to-PCI
> bridges if you need more room.
> 
> Paolo


We don't want people to use PCI down the road.
Everything should be PCIE so we can use things like native hotplug.

-- 
MST