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Wed, 23 Dec 2020 06:15:14 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 35k0e2kpt1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Dec 2020 06:15:14 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0BN6FCiw031684; Wed, 23 Dec 2020 06:15:12 GMT Received: from flaka.hsd1.ca.comcast.net (/67.180.143.163) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 22 Dec 2020 22:15:11 -0800 From: elena.ufimtseva@oracle.com To: qemu-devel@nongnu.org Subject: [PATCH v15 02/20] multi-process: add configure and usage information Date: Tue, 22 Dec 2020 22:14:37 -0800 Message-Id: <152a7fd342a326613799e04eb4869f34ff5604f9.1608702853.git.elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.25.GIT In-Reply-To: References: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9843 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 malwarescore=0 phishscore=0 mlxscore=0 adultscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012230046 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9843 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 suspectscore=0 adultscore=0 bulkscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 phishscore=0 mlxlogscore=999 spamscore=0 impostorscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012230046 Received-SPF: pass client-ip=141.146.126.79; envelope-from=elena.ufimtseva@oracle.com; helo=aserp2130.oracle.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no 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: elena.ufimtseva@oracle.com, fam@euphon.net, swapnil.ingle@nutanix.com, john.g.johnson@oracle.com, kraxel@redhat.com, jag.raman@oracle.com, quintela@redhat.com, mst@redhat.com, armbru@redhat.com, kanth.ghatraju@oracle.com, felipe@nutanix.com, thuth@redhat.com, ehabkost@redhat.com, konrad.wilk@oracle.com, dgilbert@redhat.com, alex.williamson@redhat.com, stefanha@redhat.com, thanos.makatos@nutanix.com, kwolf@redhat.com, berrange@redhat.com, mreitz@redhat.com, ross.lagerwall@citrix.com, marcandre.lureau@gmail.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Elena Ufimtseva Adds documentation explaining the command-line arguments needed to use multi-process. Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Reviewed-by: Stefan Hajnoczi --- docs/multi-process.rst | 64 ++++++++++++++++++++++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 65 insertions(+) create mode 100644 docs/multi-process.rst diff --git a/docs/multi-process.rst b/docs/multi-process.rst new file mode 100644 index 0000000000..46bb0cafc2 --- /dev/null +++ b/docs/multi-process.rst @@ -0,0 +1,64 @@ +Multi-process QEMU +================== + +This document describes how to configure and use multi-process qemu. +For the design document refer to docs/devel/qemu-multiprocess. + +1) Configuration +---------------- + +multi-process is enabled by default for targets that enable KVM + + +2) Usage +-------- + +Multi-process QEMU requires an orchestrator to launch. + +Following is a description of command-line used to launch mpqemu. + +* Orchestrator: + + - The Orchestrator creates a unix socketpair + + - It launches the remote process and passes one of the + sockets to it via command-line. + + - It then launches QEMU and specifies the other socket as an option + to the Proxy device object + +* Remote Process: + + - QEMU can enter remote process mode by using the "remote" machine + option. + + - The orchestrator creates a "remote-object" with details about + the device and the file descriptor for the device + + - The remaining options are no different from how one launches QEMU with + devices. + + - Example command-line for the remote process is as follows: + + /usr/bin/qemu-system-x86_64 \ + -machine x-remote \ + -device lsi53c895a,id=lsi0 \ + -drive id=drive_image2,file=/build/ol7-nvme-test-1.qcow2 \ + -device scsi-hd,id=drive2,drive=drive_image2,bus=lsi0.0,scsi-id=0 \ + -object x-remote-object,id=robj1,devid=lsi1,fd=4, + +* QEMU: + + - Since parts of the RAM are shared between QEMU & remote process, a + memory-backend-memfd is required to facilitate this, as follows: + + -object memory-backend-memfd,id=mem,size=2G + + - A "x-pci-proxy-dev" device is created for each of the PCI devices emulated + in the remote process. A "socket" sub-option specifies the other end of + unix channel created by orchestrator. The "id" sub-option must be specified + and should be the same as the "id" specified for the remote PCI device + + - Example commandline for QEMU is as follows: + + -device x-pci-proxy-dev,id=lsi0,socket=3 diff --git a/MAINTAINERS b/MAINTAINERS index 395e215236..c9f7024943 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3163,6 +3163,7 @@ M: Jagannathan Raman M: John G Johnson S: Maintained F: docs/devel/multi-process.rst +F: docs/multi-process.rst Build and test automation -------------------------