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Fri, 15 May 2020 07:54:46 +0000 (UTC) Subject: Re: [PATCH 3/3] docs/s390x: document vfio-ccw To: Cornelia Huck , qemu-s390x@nongnu.org References: <20200505135025.14614-1-cohuck@redhat.com> <20200505135025.14614-4-cohuck@redhat.com> From: Thomas Huth Openpgp: preference=signencrypt Message-ID: <3326e2c5-d569-57f4-0bd0-615a4fa289f8@redhat.com> Date: Fri, 15 May 2020 09:54:44 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200505135025.14614-4-cohuck@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=thuth@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/14 22:56:02 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_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-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 05/05/2020 15.50, Cornelia Huck wrote: > Add a basic example for passing a dasd via vfio-ccw. > > Signed-off-by: Cornelia Huck > --- > docs/system/s390x/vfio-ccw.rst | 58 ++++++++++++++++++++++++++++++++++ > docs/system/target-s390x.rst | 1 + > 2 files changed, 59 insertions(+) > create mode 100644 docs/system/s390x/vfio-ccw.rst > > diff --git a/docs/system/s390x/vfio-ccw.rst b/docs/system/s390x/vfio-ccw.rst > new file mode 100644 > index 000000000000..3b465578971f > --- /dev/null > +++ b/docs/system/s390x/vfio-ccw.rst > @@ -0,0 +1,58 @@ > +Subchannel passthrough via vfio-ccw > +=================================== > + > +vfio-ccw (based upon the mediated vfio device infrastructure) allows to > +make certain I/O subchannels and their devices available to a guest. The > +host will not interact with those subchannels/devices any more. > + > +Note that while vfio-ccw should work with most non-QDIO devices, only ECKD > +DASD have really been tested. s/DASD/DASDs/ ? > +Example configuration > +--------------------- > + > +Step 1: configure the host device > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + > +Note: it is recommended to use the ``mdevctl`` tool for this step. Can you also give an example on how to use it? > If this > +is not possible or wanted, follow the manual procedure below. > + > +* Locate the subchannel for the device (in this example, ``0.0.2b09``):: > + > + [root@host ~]# lscss | grep 0.0.2b09 | awk '{print $2}' > + 0.0.0313 I'd remove the "[root@host ~]" part from all examples. > +* Unbind the subchannel (in this example, ``0.0.0313``) from the standard > + I/O subchannel driver and bind it to the vfio-ccw driver:: > + > + [root@host ~]# echo 0.0.0313 > /sys/bus/css/devices/0.0.0313/driver/unbind > + [root@host ~]# echo 0.0.0313 > /sys/bus/css/drivers/vfio_ccw/bind > + > +* Create the mediated device (identified by a uuid):: > + > + [root@host ~]# uuidgen > + 7e270a25-e163-4922-af60-757fc8ed48c6 > + [root@host ~]# echo "7e270a25-e163-4922-af60-757fc8ed48c6" > /sys/bus/css/devices/0.0.0313/mdev_supported_types/vfio_ccw-io/create Maybe break the long line with a backslash? > +Step 2: configure QEMU > +~~~~~~~~~~~~~~~~~~~~~~ > + > +* Reference the created mediated device and (optionally) pick a device id to > + be presented in the guest (here, ``fe.0.1234``, which will end up visible > + in the guest as ``0.0.1234``:: > + > + -device vfio-ccw,devno=fe.0.1234,sysfsdev=/sys/bus/mdev/devices/7e270a25-e163-4922-af60-757fc8ed48c6 > + > +* Start the guest. The device (here, ``0.0.1234``) should now be usable:: > + > + [root@guest ~]# lscss -d 0.0.1234 > + Device Subchan. DevType CU Type Use PIM PAM POM CHPIDs > + ---------------------------------------------------------------------- > + 0.0.1234 0.0.0007 3390/0e 3990/e9 f0 f0 ff 1a2a3a0a 00000000 > + [root@guest ~]# chccwdev -e 0.0.1234 > + Setting device 0.0.1234 online Here I'd add a sentence saying that you could run "dmesg -t" now to check the kernel log. Then omit the timestamp in the example output below, that will shorten the lines quite a bit. > + [ 197.011652] dasd-eckd 0.0.1234: A channel path to the device has become operational > + [ 197.014468] dasd-eckd 0.0.1234: New DASD 3390/0E (CU 3990/01) with 10017 cylinders, 15 heads, 224 sectors > + [ 197.045606] dasd-eckd 0.0.1234: DASD with 4 KB/block, 7212240 KB total size, 48 KB/track, compatible disk layout > + [ 197.049034] dasda:VOL1/ 0X2B09: dasda1 Thomas