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Date: Wed, 02 May 2012 17:46:48 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 1/2] pc: add pci64 memory hole
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To: Avi Kivity <avi@redhat.com>
Cc: qemu-devel@nongnu.org

On 05/02/12 17:31, Avi Kivity wrote:
> On 05/02/2012 05:02 PM, Gerd Hoffmann wrote:
>> This patch adds a address space hole for 64bit PCI ressources.
>> It starts at 0x8000000000 (512 GB) and ends at 0x10000000000 (1 TB),
>> thus has 512 GB in size.  This matches what the seabios is doing
>> (latest master branch).
> 
> We should communicate this to seabios via fwcfg

A dsdt entry is needed for the pci64 window (see
http://code.coreboot.org/p/seabios/source/commit/482a020ec25f4cec655ddcb16b67c6f38b0844c0/),
which makes it non-trivial to turn this into a runtime option ...

> It should also only apply to -M old.

Is this the only reason you want this be runtime-switchable?

cheers,
  Gerd