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Tue, 05 May 2020 09:50:35 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-282-lOHxZUf7MHyOD3rRDxI0IA-1; Tue, 05 May 2020 09:50:32 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 85A3E1005510; Tue, 5 May 2020 13:50:31 +0000 (UTC) Received: from localhost (ovpn-112-219.ams2.redhat.com [10.36.112.219]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 29FF263F96; Tue, 5 May 2020 13:50:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588686633; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hv2XPVgR5bcCP2jOSsAKNHO0+sgNNB4i7e2WRC6VVUw=; b=G5zgwBnWGNPHjAjPpMgjJvUFpLrvAIBiIS1+IDvbL/MzX/9mTQRmQ9674Cwhq5iZbdESR0 oHH9UkCe4zd7bMs8vk+HNP1lwqTAF8M49LIVa4F6aC6Myl9Q+8XFym/bt5dcPUfqC4uF/B LDUCWrIGzsNvwBGQjCrKDq8hpL26UGc= X-MC-Unique: lOHxZUf7MHyOD3rRDxI0IA-1 From: Cornelia Huck To: qemu-s390x@nongnu.org Subject: [PATCH 1/3] docs/s390x: document the virtual css Date: Tue, 5 May 2020 15:50:23 +0200 Message-Id: <20200505135025.14614-2-cohuck@redhat.com> In-Reply-To: <20200505135025.14614-1-cohuck@redhat.com> References: <20200505135025.14614-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=cohuck@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/05 03:48:16 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: Cornelia Huck , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Add some hints about "devno" rules. Signed-off-by: Cornelia Huck --- docs/system/s390x/css.rst | 64 ++++++++++++++++++++++++++++++++++++ docs/system/target-s390x.rst | 1 + 2 files changed, 65 insertions(+) create mode 100644 docs/system/s390x/css.rst diff --git a/docs/system/s390x/css.rst b/docs/system/s390x/css.rst new file mode 100644 index 000000000000..8e18194a2f0a --- /dev/null +++ b/docs/system/s390x/css.rst @@ -0,0 +1,64 @@ +The virtual channel subsystem +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D + +QEMU implements a virtual channel subsystem with subchannels, (mostly +functionless) channel paths, and channel devices (virtio-ccw, 3270, and +devices passed via vfio-ccw). It supports multiple subchannel sets (MSS) a= nd +multiple channel subsystems extended (MCSS-E). + +All channel devices support the ``devno`` property, which takes a parameter +in the form ``..``. + +The default channel subsystem image id (````) is ``0xfe``. Devices = in +there will show up in channel subsystem image ``0`` to guests that do not +enable MCSS-E. Note that devices with a different cssid will not be visible +if the guest OS does not enable MCSS-E (which is true of all supported gue= st +operating systems today). + +Supported values for the subchannel set id (````) range from ``0-3``. +Devices with a ssid that is not ``0`` will not be visible if the guest OS +does not enable MSS (any Linux version that supports virtio also enables M= SS). +Any device may be put into any subchannel set, there is no restriction by +device type. + +The device number can range from ``0-0xffff``. + +If the ``devno`` property is not specified for a device, QEMU will choose = the +next free device number in subchannel set 0, skipping to the next subchann= el +set if no more device numbers are free. + +QEMU places a device at the first free subchannel in the specified subchan= nel +set. If a device is hotunplugged and later replugged, it may appear at a +different subchannel. (This is similar to how z/VM works.) + + +Examples +-------- + +* a virtio-net device, cssid/ssid/devno automatically assigned:: + + -device virtio-net-ccw + + In a Linux guest (without default devices and no other devices specified + prior to this one), this will show up as ``0.0.0000`` under subchannel + ``0.0.0000``. + +* a virtio-rng device in subchannel set ``0``:: + + -device virtio-rng-ccw,devno=3Dfe.0.0042 + + If added to the same Linux guest as above, it would show up as ``0.0.004= 2`` + under subchannel ``0.0.0001``. + +* a virtio-gpu device in subchannel set ``2``:: + + -device virtio-gpu-ccw,devno=3Dfe.2.1111 + + If added to the same Linux guest as above, it would show up as ``0.2.111= 1`` + under subchannel ``0.2.0000``. + +* a virtio-mouse device in a non-standard channel subsystem:: + + -device virtio-mouse-ccw,devno=3D2.0.2222 + + This would not show up in a standard Linux guest. diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst index 7d76ae97b401..37ca032d98ef 100644 --- a/docs/system/target-s390x.rst +++ b/docs/system/target-s390x.rst @@ -23,6 +23,7 @@ or vfio-ap is also available. =20 .. toctree:: s390x/vfio-ap + s390x/css =20 Architectural features =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --=20 2.21.3 From nobody Sun Feb 8 18:40:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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Tue, 05 May 2020 09:50:37 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-217-KdZYq_xSNmG4FbsEkBNpDQ-1; Tue, 05 May 2020 09:50:34 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BF6578014C0; Tue, 5 May 2020 13:50:33 +0000 (UTC) Received: from localhost (ovpn-112-219.ams2.redhat.com [10.36.112.219]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 64B335C1D3; Tue, 5 May 2020 13:50:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588686636; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0BHKYf+uyjsemkjgPewlgPN6fBK+tXCMv6UZn0yd3kI=; b=WOEPQ4daDktG5820eMWrbEq5qHfbzJ1Xn1jOaHnfYjopwT4eikpO5rZdqjoEf+rjGYUEuL 7245oOMBkeQw4DzPQT7UDgcEcBOV6Ljw9YRKM/2MYTBFrAKuHDmxXP67Q4P2EDynPc2NUR yHMtSkyLl3dKQcTsabcG3+P4jx9Pf5M= X-MC-Unique: KdZYq_xSNmG4FbsEkBNpDQ-1 From: Cornelia Huck To: qemu-s390x@nongnu.org Subject: [PATCH 2/3] docs/s390x: document 3270 Date: Tue, 5 May 2020 15:50:24 +0200 Message-Id: <20200505135025.14614-3-cohuck@redhat.com> In-Reply-To: <20200505135025.14614-1-cohuck@redhat.com> References: <20200505135025.14614-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.81; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/05 00:37:19 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: Cornelia Huck , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" 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 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +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. + +To provide a 3270 device to a guest, create a ``x-3270device`` linked to +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 charde= v. + +Example configuration +--------------------- + +* Add a ``tn3270`` chardev and a ``x-3270device`` to the QEMU command line= :: + + -chardev socket,id=3Dchar_0,host=3D0.0.0.0,port=3D23,nowait,server,tn3= 270 + -device x-terminal3270,chardev=3Dchar_0,devno=3Dfe.0.000a,id=3Dtermina= l_0 + +* Start the guest. In the guest, use ``chccwdev -e 0.0.000a`` to enable + the device. + +* On the host, start the ``x3270`` emulator:: + + x3270 :23 + +* In the guest, locate the 3270 device node under ``/dev/3270/`` (say, + ``tty1``) and start a getty on it:: + + systemctl start serial-getty@3270-tty1.service + +This should get you an addtional tty for logging into the guest. diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst index 37ca032d98ef..2592a05303ef 100644 --- a/docs/system/target-s390x.rst +++ b/docs/system/target-s390x.rst @@ -24,6 +24,7 @@ or vfio-ap is also available. .. toctree:: s390x/vfio-ap s390x/css + s390x/3270 =20 Architectural features =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --=20 2.21.3 From nobody Sun Feb 8 18:40:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" 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 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +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. + +Example configuration +--------------------- + +Step 1: configure the host device +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Note: it is recommended to use the ``mdevctl`` tool for this step. 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 + +* 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/un= bind + [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 + +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=3Dfe.0.1234,sysfsdev=3D/sys/bus/mdev/devices/7e= 270a25-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 =20 + ---------------------------------------------------------------------- + 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 + [ 197.011652] dasd-eckd 0.0.1234: A channel path to the device has be= come 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 to= tal size, 48 KB/track, compatible disk layout + [ 197.049034] dasda:VOL1/ 0X2B09: dasda1 + Done diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst index 2592a05303ef..644e404ef9fd 100644 --- a/docs/system/target-s390x.rst +++ b/docs/system/target-s390x.rst @@ -25,6 +25,7 @@ or vfio-ap is also available. s390x/vfio-ap s390x/css s390x/3270 + s390x/vfio-ccw =20 Architectural features =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --=20 2.21.3