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envelope-from=steven.sistare@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@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-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 10/9/2024 3:06 PM, Peter Xu wrote: > On Wed, Oct 09, 2024 at 02:43:44PM -0400, Steven Sistare wrote: >> On 10/8/2024 3:48 PM, Peter Xu wrote: >>> On Tue, Oct 08, 2024 at 04:11:38PM -0300, Fabiano Rosas wrote: >>>> As of half an hour ago =) We could put a feature branch up and work >>>> together, if you have more concrete thoughts on how this would look like >>>> let me know. >>> >>> [I'll hijack this thread with one more email, as this is not cpr-relevant] >>> >>> I think I listed all the things I can think of in the wiki, so please go >>> ahead. >>> >>> One trivial suggestion is we can start from the very simple, which is the >>> handshake itself, with a self-bootstrap protocol, probably feature-bit >>> based or whatever you prefer. Then we set bit 0 saying "this QEMU knows >>> how to handshake". >>> >>> Comparing to the rest requirement, IMHO we can make the channel >>> establishment the 1st feature, then it's already good for merging, having >>> feature bit 1 saying "this qemu understands named channel establishment". >>> >>> Then we add new feature bits on top of the handshake feature, by adding >>> more feature bits. Both QEMUs should first handshake on the feature bits >>> they support and enable only the subset that all support. >>> >>> Or instead of bit, feature strings, etc. would all work which you >>> prefer. Just to say we don't need to impl all the ideas there, as some of >>> them might take more time (e.g. device tree check), and that list is >>> probably not complete anyway. >> >> While writing a qtest for cpr-transfer, I discovered a problem that could be >> solved with an early migration handshake, prior to cpr_save_state / cpr_load_state. >> >> There is currently no way to set migration caps on dest qemu before starting >> cpr-transfer, because dest qemu blocks in cpr_state_load before creating any >> devices or monitors. It is unblocked after the user sends the migrate command >> to source qemu, but then the migration starts and it is too late to set migration >> capabilities or parameters on the dest. >> >> Are you OK with that restriction (for now, until a handshake is implemented)? >> If not, I have a problem. >> >> I can hack the qtest to make it work with the restriction. > > Hmm, the test case is one thing, but if it's a problem, then.. how in real > life one could set migration capabilities on dest qemu for cpr-transfer? You will allow it via the migration handshake! But right now, one can enable capabilities by adding -global migration.xxx=yyy on the target command line. > Now a similar question, and also what I overlooked previously, is how > cpr-transfer should support "-incoming defer". We need that because that's > what Libvirt uses.. with an upcoming migrate_incoming QMP command. Defer works. Start dest qemu, issue the migrate command to source qemu. Dest qemu finishes cpr_load_state and enters the main loop, listening for montitor commands. - Steve