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Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property |
Date: |
Mon, 14 Dec 2009 22:43:19 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Mon, Dec 14, 2009 at 09:40:28PM +0100, Gerd Hoffmann wrote:
> On 12/14/09 20:17, Michael S. Tsirkin wrote:
>> On Mon, Dec 14, 2009 at 06:18:29PM +0100, Gerd Hoffmann wrote:
>>> On 12/14/09 17:23, Michael S. Tsirkin wrote:
>>>> On Mon, Dec 14, 2009 at 04:01:33PM +0100, Gerd Hoffmann wrote:
>>>> So how do you do this?
>>>> Assume we have -disable_hw_csum.
>>>> We want new machine type to have it off, right?
>>>> But now you run qemu on host which does
>>>> not support hw_csum. With your suggestion
>>>> it will not enable hw csum?
>>>
>>> I have trouble getting the setup you are talking about ...
>>>
>>> Sounds like hw_csum could be enabled/disabled depending on the hardware
>>> capabilities on the host. Is that correct?
>>>
>>> cheers,
>>> Gerd
>>
>> This currently depends on version of tun driver in the host.
>
> So this has nothing to do with -M pc-0.11 backward compatibility, right?
Yes, this does. With 0.11 you must not expose this even
if supported by host. Otherwise you wnt be able to migrate to 0.11.
> You'll hit this when migrating 0.12 -> 0.12 with different host
> kernels, right? And the common bit here is that both issues can be
> handled by configuring virtio feature bits via properties, right?
Yes.
> What was the question again?
>
> cheers,
> Gerd
What do we put in e.g. 0.11 compat? Any features we enable
there might not be supported by host.
--
MST
- [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, (continued)
- [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Markus Armbruster, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property,
Michael S. Tsirkin <=
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Michael S. Tsirkin, 2009/12/14
- [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Gerd Hoffmann, 2009/12/14
- Re: [Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property, Alexander Graf, 2009/12/14