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[99.254.121.117]) by smtp.gmail.com with ESMTPSA id t3-20020a0cea23000000b006a100fa5fb2sm4809681qvp.77.2024.05.07.09.13.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 May 2024 09:13:57 -0700 (PDT) Date: Tue, 7 May 2024 12:13:54 -0400 From: Peter Xu To: Avihai Horon Cc: "Maciej S. Szmigiero" , Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , Fabiano Rosas , Alex Williamson , =?utf-8?Q?C=C3=A9dric?= Le Goater , Eric Blake , Markus Armbruster , Joao Martins , qemu-devel@nongnu.org Subject: Re: [PATCH RFC 00/26] =?utf-8?Q?Multifd_?= =?utf-8?B?8J+UgA==?= device state transfer support with VFIO consumer Message-ID: References: <1a0b3c24-fffd-4db3-a35e-e40ae2e0a074@maciej.szmigiero.name> <7e855ccb-d5af-490f-94ab-61141fa30ba8@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <7e855ccb-d5af-490f-94ab-61141fa30ba8@nvidia.com> Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.581, 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=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 Tue, May 07, 2024 at 11:41:05AM +0300, Avihai Horon wrote: > Yes, I was working on parallel VFIO migration, but in a different approach > (not over multifd) which I'm not sure is relevant to this series. > I've been skimming over your discussions but haven't had the time to go over > Maciej's series thoroughly. > I will try to find time to do this next week and see if I can help. IIUC your solution could also improve downtime, it's just that it bypasses migration in general so from that POV a multifd-based solution is preferred. Fundamentally I think you share the goal more or less on allowing concurrent vfio migrations, so it will be greatly helpful to have your input / reviews, also making sure the ultimate solution will work for all the use cases. Thanks, -- Peter Xu