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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Mon, 17 Nov 2008 20:01:55 +0800
From:	Yu Zhao <yu.zhao@...scape.net>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	"Zhao, Yu" <yu.zhao@...el.com>, Greg KH <greg@...ah.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	"Leonid.Grossman@...erion.com" <Leonid.Grossman@...erion.com>,
	Matthew Wilcox <matthew@....cx>, H L <swdevyid@...oo.com>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"achiang@...com" <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>, Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

Rusty Russell wrote:
> On Friday 07 November 2008 18:17:54 Zhao, Yu wrote:
> > Greg KH wrote:
> > > On Thu, Nov 06, 2008 at 04:40:21PM -0600, Anthony Liguori wrote:
> > >> Greg KH wrote:
> > >>> On Thu, Nov 06, 2008 at 10:47:41AM -0700, Matthew Wilcox wrote:
> > >>>> I don't think we really know what the One True Usage model is for VF
> > >>>> devices. Chris Wright has some ideas, I have some ideas and Yu Zhao
> > >>>> has some ideas. I bet there's other people who have other ideas too.
> > >>>
> > >>> I'd love to hear those ideas.
> > >>
> > >> We've been talking about avoiding hardware passthrough entirely and
> > >> just backing a virtio-net backend driver by a dedicated VF in the
> > >> host. That avoids a huge amount of guest-facing complexity, let's
> > >> migration Just Work, and should give the same level of performance.
> >
> > This can be commonly used not only with VF -- devices that have multiple
> > DMA queues (e.g., Intel VMDq, Neterion Xframe) and even traditional
> > devices can also take the advantage of this.
> >
> > CC Rusty Russel in case he has more comments.
> 
> Yes, even dumb devices could use this mechanism if you wanted to bind an 
> entire device solely to one guest.
> 
> We don't have network infrastructure for this today, but my thought was 
> to do something in dev_alloc_skb and dev_kfree_skb et al.

Is there any discussion about this on the netdev? Any prototype
available? If not, I'd like to create one and evaluate the performance
of virtio-net solution again the hardware passthrough.

Thanks,
Yu
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/