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Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER
Date: Thu, 28 May 2009 07:56:54 -0500
User-agent: Thunderbird (X11/20090409)

Paul Brook wrote:
> On Wednesday 27 May 2009, Mark McLoughlin wrote:
>> On Wed, 2009-05-27 at 09:21 -0500, Anthony Liguori wrote:
>>> We need a mechanism to toggle this for both this and virtio-blk.  The
>>> reason a toggle is needed is so that 0.11 can create the same device
>>> model as 0.10.
>> Okay, so the scenario is:
>>   - 0.10 guest running on source machine
>>   - migrate to dest machine running 0.11
>>   - the device model cannot change or the guest OS will get confused
> IMHO think the only sane response is "don't do that". Trying to support 
> migration between different qemu versions just isn't worth the pain.

It is very worth the pain.  I consider it a core requirement.

Supporting legacy workloads is an important aspect of virtualization. 
If we cannot provide a consistent environment as we evolve over time,
then we cannot support legacy workloads.

It really isn't that hard, it just requires that we exercise care.


Anthony Liguori

> Paul

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