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[Qemu-devel] [BUG] [Seabios] PCI 64bit BARs on Win2008 - unable to start

From: Alexey Korolev
Subject: [Qemu-devel] [BUG] [Seabios] PCI 64bit BARs on Win2008 - unable to start the device. (ACPI lacks the _DSM method)
Date: Wed, 30 Nov 2011 14:04:08 +1300
User-agent: Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1


We have got some issues with 64bit PCI devices support under Windows guests.
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.

I tried to investigate this problem and found document from Microsoft:

It states that the _DSM method must be implemented to support devices above 4GB.

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.


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