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From: Laszlo Ersek <lersek@redhat.com>
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Date: Wed, 23 Sep 2015 12:37:08 +0200
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Subject: Re: [Qemu-devel] [PATCH 0/3] pc: Set hw_version on all machine
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To: Igor Mammedov <imammedo@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, qemu-devel@nongnu.org, Marcel Apfelbaum <marcel.a@redhat.com>

On 09/23/15 10:04, Igor Mammedov wrote:
> On Tue, 22 Sep 2015 17:16:24 -0300
> Eduardo Habkost <ehabkost@redhat.com> wrote:
> 
>> In 2012, QEMU had a bug where it exposed QEMU version information
>> to the guest, meaning a QEMU upgrade would expose different
>> hardware to the guest OS even if the same machine-type is being
>> used.
>>
>> The bug was fixed by commit 93bfef4c6e4b23caea9d51e1099d06433d8835a4,
>> on all machines up to pc-1.0. But we kept introducing the same
>> bug on all newer machines since then. That means we are breaking
>> guest ABI every time QEMU was upgraded.
>>
>> Fix this by setting the hw_version on all PC machines, making
>> sure the hardware won't change when upgrading QEMU.
>>
>> This series is based on Michael's PCI tree, plus the "Set
>> broken_reserved_end on pc-*-2.4, not 2.5" patch I submitted
>> earlier today.
> I haven't seen this patch on list, perhaps it needs to be resubmitted?

http://lists.nongnu.org/archive/html/qemu-devel/2015-09/msg05778.html