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Re: [Qemu-devel] [PATCH] hw/pci-host: Fix x86 Host Bridges 64bit PCI hol


From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH] hw/pci-host: Fix x86 Host Bridges 64bit PCI hole
Date: Mon, 23 Oct 2017 11:16:16 +0200

On Mon, 2017-10-23 at 11:46 +0300, Marcel Apfelbaum wrote:
> On 23/10/2017 8:45, Gerd Hoffmann wrote:
> >    Hi,
> > 
> > > The guest will still run with 40 bits physical!
> > > (judging the code anyway, I hope I am wrong)
> > > 
> > > Then, the stakes are not so big, the Guest kernel will disregard
> > > the 64bit hole since is not CPU addressable and go on.
> > 
> > But then there is no working 64bit hole for hotplug ...
> > 
> 
> Hosts with old CPUs are not fit for modern PCIe devices
> having large BARs anyway, no 64bit hole in this case would
> be OK, I think.

Well, my workstation which has only 39 bits physical is kaby lake.
If you classify this as "old cpu", what is a new cpu then?

cheers,
  Gerd




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