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Re: [Qemu-devel] Re: [PATCH-RFC 13/13] virtio-net: connect to vhost net

From: Anthony Liguori
Subject: Re: [Qemu-devel] Re: [PATCH-RFC 13/13] virtio-net: connect to vhost net backend
Date: Wed, 24 Feb 2010 09:16:22 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091209 Fedora/3.0-4.fc12 Lightning/1.0pre Thunderbird/3.0

On 02/24/2010 05:46 AM, Michael S. Tsirkin wrote:

Ah, you mean telling the guest to switch features on and off: natureally
this would require guest driver changes.  This might be also non-trivial
to implement. Consider a request that has been posted without checksum,
suddenly we disable checksum support.  Guest will need a way to handle
that.  Guest OSes might also not be prepared to handle device features
going away.

It's the same as cpuid flags.

Management tools should plan appropriately and not advertise virtio features that cannot be supported throughout the migration pool. Fortunately, someone had enough foresight to allow management software to disable virtio features on a per-feature basis :-)


Anthony Liguori

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