Re: [Qemu-devel] [PULL for-1.8 1/2] pc: disable pci-info

[Gerd Hoffmann]

  Hi,

> > > Yes, I think it's a start. Q35 is a bit harder because of the MMIO
> > > region.
> > 
> > ???  Do you mean mmconfig?  That can live inside the window.
> 
> Are you sure? When I tried windows crashed but maybe I'm wrong.
> Did you try some windows guests?

At least it looks that way on my laptop:

nilsson root ~# cat /proc/iomem 
[ ... ]
dfa00000-febfffff : PCI Bus 0000:00
  [ ... ]
  f8000000-fbffffff : PCI MMCONFIG 0000 [bus 00-3f]
    f80f8000-f80f8fff : reserved
fec00000-fec003ff : IOAPIC 0
[ ... ]

The reservation seems to be different from what we are doing though.  We
(aka seabios) are creating a e820 reserved region, on my laptop mmconfig
is declared in acpi:

nilsson root ~# grep f8000000 /var/log/dmesg
[    0.103320] PCI: MMCONFIG for domain 0000 [bus 00-3f] at [mem
0xf8000000-0xfbffffff] (base 0xf8000000)
[    0.126943] PCI: MMCONFIG for domain 0000 [bus 00-3f] at [mem
0xf8000000-0xfbffffff] (base 0xf8000000)
[    0.128697] PCI: MMCONFIG at [mem 0xf8000000-0xfbffffff] reserved in
ACPI motherboard resources
[    0.160979] system 00:01: [mem 0xf8000000-0xfbffffff] could not be
reserved

Maybe this is what windows doesn't like ...

cheers,
  Gerd