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(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) 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= X-MC-Unique: ZrerjKkuMTit_m3Kuzfxmw-1 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 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 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=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1674667098964100001 Content-Type: text/plain; charset="utf-8" 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/pcidevice= s.rst new file mode 100644 index 0000000000..2086c1ca29 --- /dev/null +++ b/docs/system/s390x/pcidevices.rst @@ -0,0 +1,34 @@ +PCI devices on s390x +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +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=3D1,fid=3D0,target=3Dhostdev0,id=3Dzpc= i1 \=20 + -device vfio-pci,host=3D0000:00:00.0,id=3Dhostdev0 + +Here, the zpci device is joined with the PCI device via the ``target`` pro= perty. + +Note that we don't set bus, slot or function here for the guest as is comm= on in other +PCI implementations. Topology information is not available on s390x. Inste= ad, ``uid`` +and ``fid`` determine how the device is presented to the guest operating s= ystem. + +In case of Linux, ``uid`` will be used in the ``domain`` part of the PCI i= dentifier, and +``fid`` identifies the physical slot, i.e.:: + + qemu-system-s390x ... \ + -device zpci,uid=3D7,fid=3D8,target=3Dhostdev0,id=3Dzpc= i1 \ + ... + +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 cp= u 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 --=20 2.37.3