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[99.254.121.117]) by smtp.gmail.com with ESMTPSA id af79cd13be357-79f18ff67cdsm224705285a.18.2024.07.10.13.11.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jul 2024 13:11:56 -0700 (PDT) Date: Wed, 10 Jul 2024 16:11:53 -0400 From: Peter Xu To: Fabiano Rosas Cc: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org, qemu-block@nongnu.org, Laurent Vivier , Tyrone Ting , Bin Meng , Hao Wu , Francisco Iglesias , Paolo Bonzini , Thomas Huth , =?utf-8?Q?C=C3=A9dric?= Le Goater , qemu-arm@nongnu.org, Joel Stanley , Sai Pavan Boddu , devel@lists.libvirt.org, Luc Michel , =?utf-8?Q?C=C3=A9dric?= Le Goater Subject: Re: [PATCH v3 06/17] hw/sd/sdcard: Do not store vendor data on block drive (CMD56) Message-ID: References: <20240627162232.80428-1-philmd@linaro.org> <20240627162232.80428-7-philmd@linaro.org> <87cynmfggx.fsf@suse.de> <87a5ipfigb.fsf@suse.de> <874j8xfc9s.fsf@suse.de> <871q41f2pk.fsf@suse.de> MIME-Version: 1.0 In-Reply-To: <871q41f2pk.fsf@suse.de> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.144, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: lu8VtAiz+Y9P On Wed, Jul 10, 2024 at 04:48:23PM -0300, Fabiano Rosas wrote: > Peter Xu writes: > > > On Wed, Jul 10, 2024 at 01:21:51PM -0300, Fabiano Rosas wrote: > >> It's not about trust, we simply don't support migrations other than > >> n->n+1 and (maybe) n->n-1. So QEMU from 2016 is certainly not included. > > > > Where does it come from? I thought we suppport that.. > > I'm taking that from: > > docs/devel/migration/main.rst: > "In general QEMU tries to maintain forward migration compatibility > (i.e. migrating from QEMU n->n+1) and there are users who benefit from > backward compatibility as well." > > But of course it doesn't say whether that comes with a transitive rule > allowing n->n+2 migrations. I'd say that "i.e." implies n->n+1 is not the only forward migration we would support. I _think_ we should support all forward migration as long as the machine type matches. > > > > > The same question would be: are we requesting an OpenStack cluster to > > always upgrade QEMU with +1 versions, otherwise migration will fail? > > Will an OpenStack cluster be using upstream QEMU? If not, then that's a It's an example to show what I meant! :) Nothing else. Definitely not saying that everyone should use an upstream released QEMU (but in reality, it's not a problem, I think, and I do feel like people use them, perhaps more with the stable releases). > question for the distro. In a very practical sense, we're not requesting > anything. We barely test n->n+1/n->n-1, even if we had a strong support > statement I wouldn't be confident saying migration from QEMU 2.7 -> QEMU > 9.1 should succeed. No matter what we test in CI, I don't think we should break that for >1 versions.. I hope 2.7->9.1 keeps working, otherwise I think it's legal to file a bug by anyone. For example, I randomly fetched a bug report: https://gitlab.com/qemu-project/qemu/-/issues/1937 QEMU version: 6.2 and 7.2.5 And I believe that's the common case even for upstream. If we don't do that right for upstream, it can be impossible tasks for downstream and for all of us to maintain. -- Peter Xu