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

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Message-ID: <4916DBF7.7070501@redhat.com>
Date:	Sun, 09 Nov 2008 14:47:51 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	Anthony Liguori <anthony@...emonkey.ws>,
	"Fischer, Anna" <anna.fischer@...com>, Greg KH <greg@...ah.com>,
	H L <swdevyid@...oo.com>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"Chiang, Alexander" <achiang@...com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"rdreier@...co.com" <rdreier@...co.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

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.

-- 
error compiling committee.c: too many arguments to function

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