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Fri, 15 May 2020 09:00:10 +0000 (UTC) Date: Fri, 15 May 2020 11:00:07 +0200 From: Cornelia Huck To: Thomas Huth Subject: Re: [PATCH 2/3] docs/s390x: document 3270 Message-ID: <20200515110007.1676b17d.cohuck@redhat.com> In-Reply-To: <4ea47ea1-04d5-3073-fef6-5af07f06a4d6@redhat.com> References: <20200505135025.14614-1-cohuck@redhat.com> <20200505135025.14614-3-cohuck@redhat.com> <4ea47ea1-04d5-3073-fef6-5af07f06a4d6@redhat.com> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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=205.139.110.61; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/15 00:07:24 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] 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_H2=-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: qemu-s390x@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, 15 May 2020 09:29:42 +0200 Thomas Huth wrote: > On 05/05/2020 15.50, Cornelia Huck wrote: > > Add some basic info how to use 3270 devices. > > > > Signed-off-by: Cornelia Huck > > --- > > docs/system/s390x/3270.rst | 32 ++++++++++++++++++++++++++++++++ > > docs/system/target-s390x.rst | 1 + > > 2 files changed, 33 insertions(+) > > create mode 100644 docs/system/s390x/3270.rst > > > > diff --git a/docs/system/s390x/3270.rst b/docs/system/s390x/3270.rst > > new file mode 100644 > > index 000000000000..e367a457e001 > > --- /dev/null > > +++ b/docs/system/s390x/3270.rst > > @@ -0,0 +1,32 @@ > > +3270 devices > > +============ > > + > > +With the aid of the ``x3270`` emulator, QEMU provides limited support > > +for making a single 3270 device available to a guest. Note that this > > +supports basic features only. > > The first sentence sounds somewhat confusing. Maybe rather something like: > > QEMU can emulate a 3270 device attached to a guest, which then can be > used with a program like ``x3270`` to get a traditional 3270 terminal > for your guest. But QEMU actually relies on x3270 (or a comparable program). It only emulates the basic ccw plumbing; for the actual protocol (beyond negotiating tn3270), it relies on the emulation done by x3270. > > ? > > > +To provide a 3270 device to a guest, create a ``x-3270device`` linked to > > The device is called "x-terminal3270", isn't it? Yeah, no idea how I manged to mess that up. > > (By the way, why did we never remove the x- prefix here? Is it still > experimental?) I'd still consider it experimental: only basic functionality is supported, and (more importantly), we never came up with a scheme to properly support more than one 3270 device. The usefulness of it is quite limited. > > > +a ``tn3270`` chardev. The guest will see a 3270 channel device. In order > > +to actually be able to use it, attach the ``x3270`` emulator to the chardev. > > Can the guest only use the 3270 device if there is a x3270 attached to > it? Or are you talking about the user here? See above: x3270 does most of the heavy lifting. > > > +Example configuration > > +--------------------- > > + > > +* Add a ``tn3270`` chardev and a ``x-3270device`` to the QEMU command line:: > > "x-terminal3270" ? Nod. > > > + -chardev socket,id=char_0,host=0.0.0.0,port=23,nowait,server,tn3270 > > + -device x-terminal3270,chardev=char_0,devno=fe.0.000a,id=terminal_0 > > qemu-system-s390x: -chardev > socket,id=char_0,host=0.0.0.0,port=23,nowait,server,tn3270: Failed to > bind socket: Permission denied > > ... maybe better use a non-privileged port in the example? Makes sense. This example was lifted straight from the wiki page :)