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Wed, 4 Nov 2020 09:07:45 +0100 (CET) Date: Wed, 4 Nov 2020 09:07:45 +0100 From: Gerd Hoffmann To: Stefan Hajnoczi Subject: Re: VFIO Migration Message-ID: <20201104080745.qvpofinyni2wprq2@sirius.home.kraxel.org> References: <20201102111153.GC42093@stefanha-x1.localdomain> <20201102132844.332f680c.cohuck@redhat.com> <20201102145626.GA186617@stefanha-x1.localdomain> MIME-Version: 1.0 In-Reply-To: <20201102145626.GA186617@stefanha-x1.localdomain> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/03 22:09:52 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H5=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John G Johnson , mtsirkin@redhat.com, Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= , quintela@redhat.com, Jason Wang , Cornelia Huck , qemu-devel@nongnu.org, "Dr. David Alan Gilbert" , Kirti Wankhede , Thanos Makatos , Alex Williamson , Felipe Franciosi , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi, > > > The hardware interface together with the device state representation is called > > > a *device model*. Device models can be assigned URIs such as > > > https://qemu.org/devices/e1000e to uniquely identify them. > > > > Is that something that needs to be put together for every device where we > > want to support migration? How do you create the URI? > > Yes. If you are creating a custom device that no one else needs to > emulate then you can simply pick a unique URL: > > https://vendor.com/my-dev > > There doesn't need to be anything at the URL. It's just a unique string > that no one else will use and therefore web URLs are handy because no > one else will accidentally pick your string. If this is just a string I think it would be better to use the reverse domain name scheme (as used by virtio-serial too), i.e. - org.qemu.devices.e1000e - com.vendor.my-dev take care, Gerd