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

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Message-ID: <20081107060707.GA3860@kroah.com>
Date:	Thu, 6 Nov 2008 22:07:07 -0800
From:	Greg KH <greg@...ah.com>
To:	"Zhao, Yu" <yu.zhao@...el.com>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"achiang@...com" <achiang@...com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"matthew@....cx" <matthew@....cx>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"rdreier@...co.com" <rdreier@...co.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

On Fri, Nov 07, 2008 at 01:18:52PM +0800, Zhao, Yu wrote:
> Greg KH wrote:
>> On Wed, Oct 22, 2008 at 04:38:09PM +0800, Yu Zhao wrote:
>>> Greetings,
>>>
>>> Following patches are intended to support SR-IOV capability in the
>>> Linux kernel. With these patches, people can turn a PCI device with
>>> the capability into multiple ones from software perspective, which
>>> will benefit KVM and achieve other purposes such as QoS, security,
>>> and etc.
>> Is there any actual users of this API around yet?  How was it tested as
>> there is no hardware to test on?  Which drivers are going to have to be
>> rewritten to take advantage of this new interface?
>
> Yes, the API is used by Intel, HP, NextIO and some other anonymous 
> companies as they rise questions and send me feedback. I haven't seen their 
> works but I guess some of drivers using SR-IOV API are going to be released 
> soon.

Well, we can't merge infrastructure without seeing the users of that
infrastructure, right?

> My test was done with Intel 82576 Gigabit Ethernet Controller. The product 
> brief is at http://download.intel.com/design/network/ProdBrf/320025.pdf and 
> the spec is available at 
> http://download.intel.com/design/network/datashts/82576_Datasheet_v2p1.pdf

Cool, do you have that driver we can see?

How does it interact and handle the kvm and xen issues that have been
posted?

thanks,

greg k-h
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