From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus_driver objects Date: Wed, 19 Aug 2009 07:52:05 -0400 Message-ID: <4A8BE765.4080507@gmail.com> References: <20090814154125.26116.70709.stgit@dev.haskins.net> <20090814154308.26116.46980.stgit@dev.haskins.net> <20090815103243.GA26749@elte.hu> <4A870964.9090408@codemonkey.ws> <4A8965E0.8050608@gmail.com> <4A89FF08.30509@codemonkey.ws> <4A8AA9BD.2070909@gmail.com> <4A8AB076.6080906@redhat.com> <4A8ACE1F.6020402@gmail.com> <20090818165139.GC19846@redhat.com> <4A8B8F4E.80207@gmail.com> <4A8B9241.20300@redhat.com> <4A8B66280200005A00052A54@sinclair.provo.novell.com> <4A8BA635.9010902@redhat.com> <4A8BAC750200005A00052A83@sinclair.provo.novell.com> <4A8BE6D2.3090107@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigF390A7EA939086EFC21A099B" Cc: Gregory Haskins , Anthony Liguori , Ingo Molnar , alacrityvm-devel@lists.sourceforge.net, "Michael S. Tsirkin" , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: Avi Kivity Return-path: In-Reply-To: <4A8BE6D2.3090107@redhat.com> Sender: kvm-owner@vger.kernel.org List-Id: netdev.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigF390A7EA939086EFC21A099B Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Avi Kivity wrote: > On 08/19/2009 02:40 PM, Gregory Haskins wrote: >> >>>>>> So if I whip up a virtio-net backend for vbus with a PCI compliant= >>>>>> connector, you are happy? >>>>>> >>>>>> >>>>>> =20 >>>>> This doesn't improve virtio-net in any way. >>>>> >>>>> =20 >>>> Any why not? (Did you notice I said "PCI compliant", i.e. over >>>> virtio-pci) >>>> >>>> =20 >>> Because virtio-net will have gained nothing that it didn't have befor= e. >>> =20 >> ?? >> >> *) ABI is virtio-pci compatible, as you like >> =20 >=20 > That's not a gain, that's staying in the same place. >=20 >> *) fast-path is in-kernel, as we all like >> =20 >=20 > That's not a gain as we have vhost-net (sure, in development, but your > proposed backend isn't even there yet). >=20 >> *) model is in vbus so it would work in all environments that vbus >> supports. >> =20 >=20 > The ABI can be virtio-pci compatible or it can be vbus-comaptible. How= > can it be both? The ABIs are different. >=20 > Note that if you had submitted a virtio-net backend I'd have asked you > to strip away all the management / bus layers and we'd have ended up > with vhost-net. Sigh... >=20 >>>>> virtio already supports this model; see lguest and s390. Transport= ing >>>>> virtio over vbus and vbus over something else doesn't gain anything= >>>>> over >>>>> directly transporting virtio over that something else. >>>>> >>>>> =20 >>>> This is not what I am advocating. >>>> >>>> >>>> =20 >>> What are you advocating? As far as I can tell your virtio-vbus >>> connector plus the vbus-kvm connector is just that. >>> =20 >> I wouldn't classify it anything like that, no. Its just virtio over >> vbus. >> =20 >=20 > We're in a loop. Doesn't virtio over vbus need a virtio-vbus > connector? and doesn't vbus need a connector to talk to the hypervisor= ? >=20 No, it doesnt work like that. There is only one connector. Kind Regards, -Greg --------------enigF390A7EA939086EFC21A099B Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.11 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkqL52UACgkQP5K2CMvXmqHY7ACeNb1WRGNNTqFwpafFKn+V4aJE 8o8An1peelxo6QgsHVpBDaaSWJrtUsFg =fs0D -----END PGP SIGNATURE----- --------------enigF390A7EA939086EFC21A099B--