From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55447) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c9BjK-0001tM-Op for qemu-devel@nongnu.org; Tue, 22 Nov 2016 09:07:32 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c9BjH-0001Su-Hb for qemu-devel@nongnu.org; Tue, 22 Nov 2016 09:07:26 -0500 References: <1477641400-23292-1-git-send-email-aik@ozlabs.ru> <20161028120712.4a911866@bahia> <20161031025314.GJ18226@umbus.fritz.box> <20161101024634.GA14860@umbus.fritz.box> <1479218565.3319.18.camel@redhat.com> <3353ecef-2308-13e3-025d-df41b2e89945@ozlabs.ru> <1479457042.1391.11.camel@redhat.com> <1479733731.4367.4.camel@redhat.com> From: Eric Blake Message-ID: <3cf80193-ce8f-b0f0-a574-219d5223956b@redhat.com> Date: Tue, 22 Nov 2016 08:07:20 -0600 MIME-Version: 1.0 In-Reply-To: <1479733731.4367.4.camel@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="oXKJ9AhsR8rrP6aSoXWd867c6r9V4sLsV" Subject: Re: [Qemu-devel] [libvirt] [Qemu-ppc] [RFC PATCH qemu] spapr_pci: Create PCI-express root bus by default List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Andrea Bolognani , Alexey Kardashevskiy , David Gibson Cc: Alex@redhat.com, libvir-list@redhat.com, Greg Kurz , qemu-devel@nongnu.org, qemu-ppc@nongnu.org, Paolo Bonzini This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --oXKJ9AhsR8rrP6aSoXWd867c6r9V4sLsV From: Eric Blake To: Andrea Bolognani , Alexey Kardashevskiy , David Gibson Cc: Alex@redhat.com, libvir-list@redhat.com, Greg Kurz , qemu-devel@nongnu.org, qemu-ppc@nongnu.org, Paolo Bonzini Message-ID: <3cf80193-ce8f-b0f0-a574-219d5223956b@redhat.com> Subject: Re: [libvirt] [Qemu-ppc] [RFC PATCH qemu] spapr_pci: Create PCI-express root bus by default References: <1477641400-23292-1-git-send-email-aik@ozlabs.ru> <20161028120712.4a911866@bahia> <20161031025314.GJ18226@umbus.fritz.box> <20161101024634.GA14860@umbus.fritz.box> <1479218565.3319.18.camel@redhat.com> <3353ecef-2308-13e3-025d-df41b2e89945@ozlabs.ru> <1479457042.1391.11.camel@redhat.com> <1479733731.4367.4.camel@redhat.com> In-Reply-To: <1479733731.4367.4.camel@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 11/21/2016 07:08 AM, Andrea Bolognani wrote: >> If libvirt is using a specific version of pseries, then it already kno= ws >> that <=3D2.7 has pci.0 as a root, pcie.0 otherwise. libvirt has a know= ledge >> what QEMU version has what, right? >=20 > It doesn't yet, that's the point :) >=20 > We *could* add such knowledge to libvirt[1], but *existing* > libvirt versions would still not know about it, which means > that upgrading QEMU withough upgrading libvirt will result > in failure to create new guests. But that's okay. In general, we try to promise that: old qemu + old libvirt works new qemu + new libvirt works old qemu + new libvirt works new qemu + old libvirt is untested, and may require a libvirt upgrade In other words, as long as you update your stack from top down (libvirt before qemu), you should be fine. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --oXKJ9AhsR8rrP6aSoXWd867c6r9V4sLsV Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJYNFEYAAoJEKeha0olJ0NqjGYH/iV7jBr0C+OKnm0fyclJU1Dx uLocyis+0AvdwI8k9r8/HgQlFRepDUqwata3XUO20ISafNf/8qIwBzjLJXmQtulL MZ7epu7hd91CxcSwbwG19lNgp3ZN4ycHPNRevy8fk38QKujUAaAJu53Hhi7kj7S2 N4koCTNV4OcjoljwG2HI3AmUMb+hsg8RfNZrdiENLHVhH32Rl/lUthT8Rjus709Q n5JbUg0VfNspPo86ORvC23sz5hJ2hF6Y0RVuNaE9yIFGKqEMtx6/gQ6mtcI8YQYK gCeim2uBn5xy8q92DYuEHDVF0QNF56BSG2v6YD/zVk1iEq2PAYxrxkkU0qeoxFc= =Q12p -----END PGP SIGNATURE----- --oXKJ9AhsR8rrP6aSoXWd867c6r9V4sLsV--