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Thu, 1 Oct 2020 09:28:37 +0200 (CEST) Date: Thu, 1 Oct 2020 09:28:37 +0200 From: Gerd Hoffmann To: Stefan Hajnoczi Subject: Re: Outline for VHOST_USER_PROTOCOL_F_VDPA Message-ID: <20201001072837.xbiomrvbox6ukl2c@sirius.home.kraxel.org> References: <20200928092537.GA44353@stefanha-x1.localdomain> <20200929020114-mutt-send-email-mst@kernel.org> <20200929085751.GA181609@stefanha-x1.localdomain> <20200929055110-mutt-send-email-mst@kernel.org> <20200929183824.GC191675@stefanha-x1.localdomain> <20200930034807-mutt-send-email-mst@kernel.org> <20200930145752.GB320669@stefanha-x1.localdomain> MIME-Version: 1.0 In-Reply-To: <20200930145752.GB320669@stefanha-x1.localdomain> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 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 = 2020/10/01 02:15:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.469, 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: lulu@redhat.com, tiwei.bie@intel.com, "Michael S. Tsirkin" , jasowang@redhat.com, qemu-devel@nongnu.org, raphael.norwitz@nutanix.com, maxime.coquelin@redhat.com, Felipe Franciosi , marcandre.lureau@redhat.com, Nikos Dragazis , changpeng.liu@intel.com, Daniele Buono Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi, > > Architecturally, I think we can have 3 processes: > > > > VMM -- guest device emulation -- host backend > > > > to me this looks like increasing our defence in depth strength, > > as opposed to just shifting things around ... > > Cool idea. Isn't that exactly what we can do once the multi-process qemu patches did land, at least for block devices? With "VMM" being main qemu, "guest device emulation" being offloaded to one (or more) remote qemu process(es), and qemu-storage-daemon being the host backend? take care, Gerd