From patchwork Wed Jan 25 17:15:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Mitterle X-Patchwork-Id: 13115882 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 02B18C54E94 for ; Wed, 25 Jan 2023 17:18:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pKjOf-0002PS-Cd; Wed, 25 Jan 2023 12:17:17 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pKjOb-0002On-Sn for qemu-devel@nongnu.org; Wed, 25 Jan 2023 12:17:13 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pKjOS-0003Oo-Sa for qemu-devel@nongnu.org; Wed, 25 Jan 2023 12:17:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1674667021; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=RTjLRZXhiXJBykDxZuNmXAcx9d/wKSbsdnWLy82R26s=; b=RS3Jn2i2n9teecK8K7cFwk1J7HENg9XSQbE4j0DP6+RElSQt9wlLvrcNzF1gilGMLvAxx6 FM03KhwcqXazcAlY0OW210XwWDuw5cXSUMLEnZ8y4K8tXpXxpnuKX43XBav1t8Q+wLvU/r 6jhMS+2ds4j05f4mS0r2qZUwtgRmJps= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-219-ZrerjKkuMTit_m3Kuzfxmw-1; Wed, 25 Jan 2023 12:15:33 -0500 X-MC-Unique: ZrerjKkuMTit_m3Kuzfxmw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AF17E3813F29; Wed, 25 Jan 2023 17:15:32 +0000 (UTC) Received: from fedora.. (ovpn-194-166.brq.redhat.com [10.40.194.166]) by smtp.corp.redhat.com (Postfix) with ESMTP id 153A12026D4B; Wed, 25 Jan 2023 17:15:30 +0000 (UTC) From: Sebastian Mitterle To: qemu-devel@nongnu.org Cc: qemu-s390x@nongnu.org, qemu-trivial@nongnu.org, thuth@redhat.com, clegoate@redhat.com, cohuck@redhat.com Subject: [PATCH] docs/s390x/pcidevices: document pci devices on s390x Date: Wed, 25 Jan 2023 18:15:30 +0100 Message-Id: <20230125171530.49542-1-smitterl@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=smitterl@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add some documentation about the zpci device and how to use it with pci devices on s390x. Used source: Cornelia Huck's blog post https://people.redhat.com/~cohuck/2018/02/19/notes-on-pci-on-s390x.html Signed-off-by: Sebastian Mitterle --- docs/system/s390x/pcidevices.rst | 34 ++++++++++++++++++++++++++++++++ docs/system/target-s390x.rst | 1 + 2 files changed, 35 insertions(+) create mode 100644 docs/system/s390x/pcidevices.rst diff --git a/docs/system/s390x/pcidevices.rst b/docs/system/s390x/pcidevices.rst new file mode 100644 index 0000000000..2086c1ca29 --- /dev/null +++ b/docs/system/s390x/pcidevices.rst @@ -0,0 +1,34 @@ +PCI devices on s390x +==================== + +PCI devices on s390x work differently than on other architectures. + +To start with, using a PCI device requires the additional ``zpci`` device. For example, +in order to pass a PCI device ``0000:00:00.0`` through you'd specify:: + + qemu-system-s390x ... \ + -device zpci,uid=1,fid=0,target=hostdev0,id=zpci1 \ + -device vfio-pci,host=0000:00:00.0,id=hostdev0 + +Here, the zpci device is joined with the PCI device via the ``target`` property. + +Note that we don't set bus, slot or function here for the guest as is common in other +PCI implementations. Topology information is not available on s390x. Instead, ``uid`` +and ``fid`` determine how the device is presented to the guest operating system. + +In case of Linux, ``uid`` will be used in the ``domain`` part of the PCI identifier, and +``fid`` identifies the physical slot, i.e.:: + + qemu-system-s390x ... \ + -device zpci,uid=7,fid=8,target=hostdev0,id=zpci1 \ + ... + +will be presented in the guest as:: + + # lspci -v + 0007:00:00.0 ... + Physical Slot: 00000008 + ... + +Finally, note that you might have to enable the ``zpci`` feature in the cpu model in oder to use +it. diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst index c636f64113..fe8251bdef 100644 --- a/docs/system/target-s390x.rst +++ b/docs/system/target-s390x.rst @@ -33,3 +33,4 @@ Architectural features .. toctree:: s390x/bootdevices s390x/protvirt + s390x/pcidevices