Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

[Avi Kivity <avi@redhat.com>]

Matthew Wilcox wrote:
>> What we would rather do in KVM, is have the VFs appear in the host as 
>> standard network devices.  We would then like to back our existing PV 
>> driver to this VF directly bypassing the host networking stack.  A key 
>> feature here is being able to fill the VF's receive queue with guest 
>> memory instead of host kernel memory so that you can get zero-copy 
>> receive traffic.  This will perform just as well as doing passthrough 
>> (at least) and avoid all that ugliness of dealing with SR-IOV in the guest.
>>     
>
> This argues for ignoring the SR-IOV mess completely.

It does, but VF-in-host is not the only model that we want to support.  
It's just the most appealing.

There will definitely be people who want to run VF-in-guest.

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