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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 2.0.0.21 (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.
Regards,
Anthony Liguori
> Paul
>
- [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Mark McLoughlin, 2009/05/22
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Avi Kivity, 2009/05/24
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Anthony Liguori, 2009/05/27
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Paul Brook, 2009/05/28
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER,
Anthony Liguori <=
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Paul Brook, 2009/05/28
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Anthony Liguori, 2009/05/28
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Dor Laor, 2009/05/28
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Mark McLoughlin, 2009/05/29
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Anthony Liguori, 2009/05/29
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Avi Kivity, 2009/05/31
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Anthony Liguori, 2009/05/29
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Mark McLoughlin, 2009/05/29
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Dor Laor, 2009/05/31
- Re: [Qemu-devel] [PATCH] Change virtio-console to PCI_CLASS_SERIAL_OTHER, Dor Laor, 2009/05/31