[SeaBIOS] [RFC PATCH 0/2] Allow RedHat PCI bridges reserve more buses than necessary during init
Gerd Hoffmann
kraxel at redhat.com
Fri Jul 21 14:42:32 CEST 2017
On Fri, 2017-07-21 at 15:15 +0300, Marcel Apfelbaum wrote:
> On 21/07/2017 13:04, Gerd Hoffmann wrote:
> > Hi,
> >
> > > > What about window sizes? IIRC there was a plan to provide
> > > > allocation
> > > > hints for them too ...
> > >
> > > Yes, is in my TODO list, however not as part of Aleksandr's
> > > series
> > > which aims to provide PCIe-PCI bridge hotplug support.
> >
> > I'd prefer to have a single vendor capability for all resource
> > allocation hints provided by qemu.
> >
>
> [Adding Laszlo]
>
>
> Sure, the capability looking something like:
>
> [flags: reserve-buses|reserve-IO|reserve-MEM|...]
> [extra-buses][IO-size][MEM-size]
>
> if reserve-buses -> use 'extra-buses' value and so on
Do we need the flags? We can use "value == 0 -> no hint for you".
Also what about prefetchable vs. non-prefetchable memory? I guess we
want a size hint for both memory windows?
cheers,
Gerd
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