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Date: Wed, 30 Nov 2011 09:49:04 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20111130074903.GD17781@redhat.com>
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Subject: Re: [Qemu-devel] [BUG] [Seabios] PCI 64bit BARs on Win2008 - unable
 to start the device. (ACPI lacks the _DSM method)
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To: Alexey Korolev <alexey.korolev@endace.com>
Cc: sfd@endace.com, seabios@seabios.org, qemu-devel@nongnu.org

On Wed, Nov 30, 2011 at 02:04:08PM +1300, Alexey Korolev wrote:
> Hi,
>=20
> We have got some issues with 64bit PCI devices support under Windows gu=
ests.
> Windows fails to start any PCI devices with 64bit BARs when size
> exceeds 512MB with error code 12 (can't allocate resources). In
> other words it fails when the PCI memory region is located above
> 4GB.
>=20
> I tried to investigate this problem and found document from Microsoft:
> http://msdn.microsoft.com/en-us/windows/hardware/gg462986
>=20
> It states that the _DSM method must be implemented to support
> devices above 4GB.

That's not how I read it:
	Windows Vista always respects the boot configuration of devices above
	4=C2=A0GB, considering the processor=E2=80=99s addressing capability and=
 the version
	of the Windows operating system that is running.

> Unfortunately I'm not familiar with ACPI code of seabios, so can't
> implement the _DSM method. May be you have other ideas what needs to
> be done to fix it? Any help is appreciated.
>=20
> Thanks,
> Alexey

Could you share some more detail about your setup?

--=20
MST