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Tsirkin" Subject: Re: [PATCH RFC] virtio-fs: force virtio 1.x usage Message-ID: <20200701181917.62538421.cohuck@redhat.com> In-Reply-To: <20200630090327-mutt-send-email-mst@kernel.org> References: <20200629102758.421552-1-cohuck@redhat.com> <20200630121037.GC91444@stefanha-x1.localdomain> <20200630142504.688aa989.cohuck@redhat.com> <20200630090327-mutt-send-email-mst@kernel.org> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=cohuck@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=cohuck@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/01 01:29:47 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: "Dr. David Alan Gilbert" , Stefan Hajnoczi , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, 30 Jun 2020 09:04:38 -0400 "Michael S. Tsirkin" wrote: > On Tue, Jun 30, 2020 at 02:25:04PM +0200, Cornelia Huck wrote: > > What bothers me most is that you need to explicitly request a device to > > be modern-only, while that should be the default for any newly added > > device. Hence the approach with the centralized list of device types > > mentioned in a parallel thread. The main problem with that is that the > > proxy device starts getting realized before the virtio device with its > > id is present... I failed to find a solution so far. But I'd really > > like an approach that can work for all transports. > > So how about simply validating that the device is modern only, > unless it's one of the whitelist? Who would do the validation, the virtio core? How can it distinguish between transitional and non-transitional? But maybe I'm just not getting your idea. Also, ccw does not currently have a way to explicitly configure a device non-transitional; the revisions can be used to fence off newer features, going down to legacy-only, but fencing off older features is not possible (that is only done by the device, if it has no legacy support).