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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 23:14:16 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Mon, Dec 14, 2009 at 10:12:14PM +0100, Gerd Hoffmann wrote:
> On 12/14/09 21:43, Michael S. Tsirkin wrote:
>> What do we put in e.g. 0.11 compat? Any features we enable
>> there might not be supported by host.
>
> compat properties as usual?
>
> Sorry, I still fail to see your problem.
>
> You'll have a 'disable' bitmap. Fill it via 'features=<bitmap-prop>'.
> Or using separate properties for each feature.
> qemu goes figure host_features. When done it masks out the features
> disabled via properties. The result is used as final feature bitmap.
>
> -M pc-0.11 will disable hw_checksum
> management software can do it too via -device virtio-net-pci,... if some
> machines in the pool don't support it. And of course qemu will disable
> it on its own in case the host kernel doesn't support it.
>
> cheers,
> Gerd
management is always behind :). Imagine a new and improved qemu. I run
old management. I expect to see old properties, but old management can
not disable new ones :)
--
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
- 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, 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, 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