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

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Message-ID: <20081107061952.GF3860@kroah.com>
Date:	Thu, 6 Nov 2008 22:19:52 -0800
From:	Greg KH <greg@...ah.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	"Fischer, Anna" <anna.fischer@...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

On Thu, Nov 06, 2008 at 03:58:54PM -0700, 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.  Just have the
> host driver expose multiple 'ethN' devices.

That would work, but do we want to do that for every different type of
driver?

thanks,

greg k-h
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