From mboxrd@z Thu Jan 1 00:00:00 1970 From: ravi kerur Subject: Re: Q on ioctl support in netfront/netback Date: Wed, 17 Feb 2010 12:00:53 -0800 Message-ID: References: <4B791671.4050902@citrix.com> <20100216181454.GD21067@phenom.dumpdata.com> <20100217164045.GA18387@phenom.dumpdata.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1103750594==" Return-path: In-Reply-To: <20100217164045.GA18387@phenom.dumpdata.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Konrad Rzeszutek Wilk Cc: Paul Durrant , "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org --===============1103750594== Content-Type: multipart/alternative; boundary=0016363b86a8c6bbb1047fd14e32 --0016363b86a8c6bbb1047fd14e32 Content-Type: text/plain; charset=ISO-8859-1 Hi Konrad, Pasi Thanks for your inputs. Looks like we(our team) needs to take a step back and evaluate this and other things we have discovered in the past few days. We will get back to you with more questions. Thanks -RK On Wed, Feb 17, 2010 at 8:40 AM, Konrad Rzeszutek Wilk < konrad.wilk@oracle.com> wrote: > On Wed, Feb 17, 2010 at 08:19:14AM -0800, ravi kerur wrote: > > Hi Konrad, > > > > Using PCI passthrough(I believe it is via config file changes) prevents > > other domU's accessing the NIC correct? If I use it, would the network > > That is correct. > > > transmit/receive still happen via netfront/netback drivers? > > If you have two NICs, where one of them is PCI passthrough and > the other dedicated to the guests, then the second can serve as > netback/netfront. > > Thought I wonder if you can have the netback in the guest. This > way you could fiddle with your registers in one domain, and export > a network interface (vif) to the other guests from the domain that > owns the PCI device. > --0016363b86a8c6bbb1047fd14e32 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Konrad, Pasi

Thanks for your inputs. Looks like we(our team) need= s to take a step back and evaluate this and other things we have discovered= in the past few days. We will get back to you with more questions.

Thanks
-RK

On Wed, Feb 17, 2010 at 8:4= 0 AM, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote:
On Wed, Feb 17, 2010 at 08:19:14AM -0800, ravi kerur wrot= e:
> Hi Konrad,
>
> Using PCI passthrough(I believe it is via config file changes) prevent= s
> other domU's accessing the NIC correct? If I use it, would the net= work

That is correct.

> transmit/receive still happen via netfront/netback drivers?

If you have two NICs, where one of them is PCI passthrough and
the other dedicated to the guests, then the second can serve as
netback/netfront.

Thought I wonder if you can have the netback in the guest. This
way you could fiddle with your registers in one domain, and export
a network interface (vif) to the other guests from the domain that
owns the PCI device.

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