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Date: Wed, 28 Dec 2011 13:43:29 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20111228114329.GC26310@redhat.com>
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Subject: Re: [Qemu-devel] [Seabios] [PATCH 0/3] 64bit PCI BARs allocations
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To: Alexey Korolev <alexey.korolev@endace.com>
Cc: sfd@endace.com, yamahata@valinux.co.jp, seabios@seabios.org, qemu-devel@nongnu.org

On Wed, Dec 28, 2011 at 05:41:20PM +1300, Alexey Korolev wrote:
> Hi,
> 
> There were a number of requests about support of 64bit PCI BAR allocations.
> 
> Also we have observed the issue on guests with older linux version
> (2.6.18): if we
> have a 64bit BAR allocated within first 4GB, the OS may hang during
> start process.
> (I guess it is an OS bug, but we need to take care of this).
> 
> This patch addresses these two issues and allows 64bit BARs to be
> allocated in ranges
> above 4GB.
> Patch consists of three parts:
> 1. Add new range above 4GB in _CRS table to let Windows 2008 work
> properly. Thanks
> a lot to Michael S. Triskin for this brilliant idea.
> 2. Added new PCI_REGION_TYPE_PREFMEM_64 region type in pciinit and changed
> types of variables.
> 3. Take care about PCI devices with 64bit BARs on secondary buses.
> 
> Patches have been tested on several configurations which includes
> linux 2.6.18 - 3.0 &
> windows 2008. Everything works quite well.

Which qemu version did you use?