From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D74BDC433E0 for ; Sun, 17 May 2020 17:53:42 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A1FC720758 for ; Sun, 17 May 2020 17:53:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="hIRtPH9L" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A1FC720758 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:45350 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jaNTp-0000ye-Ru for qemu-devel@archiver.kernel.org; Sun, 17 May 2020 13:53:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36164) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jaNT2-0000Bb-Dv for qemu-devel@nongnu.org; Sun, 17 May 2020 13:52:53 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:49855 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jaNT1-0004L6-Q9 for qemu-devel@nongnu.org; Sun, 17 May 2020 13:52:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589737970; 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:openpgp:openpgp; bh=QqauE12chVz8judRHlrYZo/VTwCcSh9tKo6YM3FVs2I=; b=hIRtPH9LXOnknwZX71d9ZxYgz7hOuroaLyCloGW9YlBpmjCVLZmCatRZlaEYVCQ9NLLne/ E7wdiCvkx9QRsstgKfGAjJTuuIaT8y0VwmY3wa9OsUuGCcO1gSMRE2dijvQ0g+mXZjewTQ v/osQiM8M3hEp7p/7Jmx4O3o++niY0k= 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-107-XLQwx9HVNeKxVGbgwqEgCw-1; Sun, 17 May 2020 13:52:47 -0400 X-MC-Unique: XLQwx9HVNeKxVGbgwqEgCw-1 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 26BEC8014D7; Sun, 17 May 2020 17:52:46 +0000 (UTC) Received: from thuth.remote.csb (ovpn-112-98.ams2.redhat.com [10.36.112.98]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4DA555C1B2; Sun, 17 May 2020 17:52:45 +0000 (UTC) Subject: Re: [PATCH v2 3/3] docs/s390x: document vfio-ccw To: Cornelia Huck , qemu-s390x@nongnu.org References: <20200515151518.83950-1-cohuck@redhat.com> <20200515151518.83950-4-cohuck@redhat.com> From: Thomas Huth Openpgp: preference=signencrypt Message-ID: <290bcced-fac8-cc9b-5a63-deab895b3ffd@redhat.com> Date: Sun, 17 May 2020 19:52:43 +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: <20200515151518.83950-4-cohuck@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/17 13:23:43 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 15/05/2020 17.15, 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 | 72 ++++++++++++++++++++++++++++++++++ > docs/system/target-s390x.rst | 1 + > 2 files changed, 73 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..4cfd22c3b789 > --- /dev/null > +++ b/docs/system/s390x/vfio-ccw.rst > @@ -0,0 +1,72 @@ > +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 > +DASDs have really been tested. > + > +Example configuration > +--------------------- > + > +Step 1: configure the host device > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + > +Note: it is recommended to use the ``mdevctl`` tool for this step. > + > +To define the same device as configured below to be started > +automatically, use > + > +:: > + > + [root@host ~]# driverctl -b css set-override 0.0.0313 vfio_ccw > + [root@host ~]# mdevctl define -u 7e270a25-e163-4922-af60-757fc8ed48c6\ > + -p 0.0.0313 -t vfio-ccw_io -a > + > +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/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 Maybe the uuidgen lines should now be moved before the mdevctl example already, so that it is already clear there where the uuid comes from? Thomas