[libvirt] [PATCH 3/3] conf: restrict where dmi-to-pci-bridge can be connected

[Andrea Bolognani]

On Mon, 2016-08-08 at 15:33 -0400, Laine Stump wrote:
> > Doesn't
> > 
> >   https://bugzilla.redhat.com/1363648#c4
> > 
> > tell us that we *need* to use a pcie-root-port when plugging
> > stuff into a pcie-expander-bus?
>  
> No, I think you're misunderstanding Marcel's comment:
> 
> > (In reply to Laine Stump from comment #2)
> > > Marcel - is this actually supported by qemu?
> > 
> > Yes, and if doesn't work is a bug.
> > The best way to think of pxb/pbx-pcie is that it exposes a
> > new pcie.0 like bus.
> > The only difference is that you cannot have devices plugged
> > directly into it (integrated device).
> 
> I specifically asked him if what the reporter attempted
> (plugging a dmi-to-pci-bridge directly into a
> pcie-expander-bus) was supported, and he said "yes".
> 
> He then said that the only difference is that you can't plug
> [endpoint] devices directly into it. A dmi-to-pci-bridge is
> not an endpoint device. Aside from endpoint devices, the only
> other things you are supposed to plug into pcie-root are
> pcie-root-ports and dmi-to-pci-bridges.

The "endpoint" part is the one I was missing. It makes sense
now :)

-- 
Andrea Bolognani / Red Hat / Virtualization