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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 0F111C47247 for ; Tue, 5 May 2020 13:52:53 +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 CDFAA206A5 for ; Tue, 5 May 2020 13:52:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="G5zgwBnW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDFAA206A5 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]:45182 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jVy0C-0007oQ-0v for qemu-devel@archiver.kernel.org; Tue, 05 May 2020 09:52:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51464) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jVxxz-0004G2-IQ for qemu-devel@nongnu.org; Tue, 05 May 2020 09:50:35 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:58801 helo=us-smtp-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 1jVxxy-0002jB-IP for qemu-devel@nongnu.org; Tue, 05 May 2020 09:50:35 -0400 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= 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 X-MC-Unique: lOHxZUf7MHyOD3rRDxI0IA-1 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) 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-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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 paramete= r +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 visibl= e +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