[SeaBIOS] [PATCH] acpi: hide 64-bit PCI hole for Windows XP
Michael S. Tsirkin
mst at redhat.com
Mon Aug 12 09:56:59 CEST 2013
On Mon, Aug 12, 2013 at 08:37:00AM +0200, Gerd Hoffmann wrote:
> Hi,
>
> > If we make it a rule that PCI is`setup before ACPI tables
> > are read, then QEMU can do the patching itself when
> > it detects BIOS reading the tables.
>
> Approach makes sense to me. The ordering constrain shouldn't be a big
> burden, hardware detection+bringup (including pci setup) is the first
> thing done by the firmware, loading/generating acpi tables is one of the
> last things. And it avoids the need to communicate the addresses (or
> patch locations) between qemu+firmware.
>
> What do you want to use this for? pmbase and xbar are simple, they are
> just a single register read. pci io windows needs a root bus scan, but
> should be doable too.
Right. We'll need to migrate the offsets for patching since
they are tied to specific AML and this can change.
> > Gerd, Laszlo,others, does this rule work for alternative firmwares?
>
> It surely works for coreboot, and I would be very surprised if this
> causes trouble for ovmf.
>
> cheers,
> Gerd
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