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Date: Wed, 24 Jul 2013 15:00:50 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] pc: limit 64 bit hole to 2G by default
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Eduardo Habkost <ehabkost@redhat.com>, qemu-devel@nongnu.org, Isaku Yamahata <yamahata@valinux.co.jp>, Alex Williamson <alex.williamson@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Laszlo Ersek <lersek@redhat.com>, =?ISO-8859-1?Q?Andreas_F=E4rber?= <afaerber@suse.de>, David Gibson <david@gibson.dropbear.id.au>

On 07/24/13 11:51, Michael S. Tsirkin wrote:
> On Wed, Jul 24, 2013 at 09:01:51AM +0200, Gerd Hoffmann wrote:
>> On 07/24/13 08:01, Michael S. Tsirkin wrote:
>>> It turns out that some 32 bit windows guests crash
>>> if 64 bit PCI hole size is >2G.
>>
>> Ah, *that* is the reason for winxp crashing with a 64bit hole.
>>
>> Current seabios uses a slightly different approach: the 64bit hole is
>> present only in case it is actually used to map bars there, and seabios
>> tries to fit everything into the 32bit hole first.
> 
> Yes. But this doesn't work with device hotplug.

Sure.  This wasn't meant as request to match current seabios behavior.
Just wanted provide some additional background info.

> I intend to send a patch to properties that allows writing
> "size=1G" instead.
> Will this address your comment?

Sounds good.

cheers,
  Gerd