On Tue, Nov 26, 2013 at 04:59:33PM +0100, Gerd Hoffmann wrote:
>
> 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
> [ ... ]
True. Mine also has:
_CRS in DSDT:
DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
Cacheable, ReadWrite,
0x00000000, // Granularity
0x00100000, // Range Minimum
0xFEBFFFFF, // Range Maximum
0x00000000, // Translation Offset
0xFEB00000, // Length
,, _Y23, AddressRangeMemory, TypeStatic)
MCFG
[02Ch 0044 8] Base Address : 00000000F8000000
[034h 0052 2] Segment Group Number : 0000
[036h 0054 1] Start Bus Number : 00
[037h 0055 1] End Bus Number : 3F
[038h 0056 4] Reserved : 00000000
so they do overlap apparently without issues.
Well, this definitely simplifies things: this probably means we can just
do the same thing for piix and q35.
> 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
>
>
