Re: [PATCH 1/9] pci-assign: Optionally enable 64bit BARs in guest

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On Tue, 2012-01-31 at 15:33 +0200, Avi Kivity wrote:
> On 01/31/2012 03:21 PM, Jan Kiszka wrote:
> > On 2012-01-31 14:10, Avi Kivity wrote:
> > > On 01/31/2012 02:57 PM, Jan Kiszka wrote:
> > >>>>> Seems fine, but do we really need the option?  If it doesn't work we
> > >>>>> should treat it as an ordinary but and fix it.
> > >>>>
> > >>>> So far it's against the architecture of the emulated system: our current
> > >>>> chipset predates 64 bit PCI.
> > >>>>
> > >>>
> > >>> Then it should be enabled/disabled at the chipset level.
> > >>
> > >> Makes me wonder if we already do some filtering if the device supports
> > >> 64 bit but the next bridge does not.
> > >>
> > > 
> > > Our 440fx does support 64-bit bars, so the question doesn't arise for
> > > x86.  Instead we violate the spec.
> >
> > If you mean by "our" the 440fx-qemu, not the real 440fx. That one does
> > not even support >1GB RAM.
> 
> Yes, that's what I meant.  It also supports pci hotplug, more slots, cpu
> hotplug, etc.

I'll drop this patch for now, it was just something I enabled based on a
query from MST and didn't want to lose it.  Maybe we need the option in
PCI core, but I'm just turn it on and hope for the best w/o giving users
a way to disable it.  Thanks,

Alex

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