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Mon, 24 Feb 2020 20:57:15 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 01OKvEYT009858; Mon, 24 Feb 2020 20:57:14 GMT Received: from jaraman-bur-1.us.oracle.com (/10.152.33.39) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 24 Feb 2020 12:57:13 -0800 From: Jagannathan Raman To: qemu-devel@nongnu.org Subject: [PATCH v5 50/50] multi-process: add configure and usage information Date: Mon, 24 Feb 2020 15:55:41 -0500 Message-Id: X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9541 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002240153 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9541 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 bulkscore=0 clxscore=1015 malwarescore=0 impostorscore=0 adultscore=0 phishscore=0 priorityscore=1501 mlxlogscore=999 spamscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002240153 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.86 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, liran.alon@oracle.com, stefanha@redhat.com, thanos.makatos@nutanix.com, rth@twiddle.net, 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Elena Ufimtseva Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson --- docs/qemu-multiprocess.txt | 86 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 docs/qemu-multiprocess.txt diff --git a/docs/qemu-multiprocess.txt b/docs/qemu-multiprocess.txt new file mode 100644 index 0000000..f156177 --- /dev/null +++ b/docs/qemu-multiprocess.txt @@ -0,0 +1,86 @@ +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 +---------------- + +To enable support for multi-process add --enable-mpqemu +to the list of options for the "configure" script. + + +2) Usage +-------- + +To start qemu with devices intended to run in a separate emulation +process without libvirtd support, the following should be used on QEMU +command line. As of now, we only support the emulation of lsi53c895a +in a separate process + +* Since parts of the RAM are shared between QEMU & remote process, a + memory-backend-file is required to facilitate this, as follows: + + -object memory-backend-file,id=mem,mem-path=/dev/shm/,size=4096M,share=on + +* The devices to be emulated in the separate process are defined as + before with addition of "rid" suboption that serves as a remote group + identificator. + + -device ,rid="remote process id" + + For example, for non multi-process qemu: + -device lsi53c895a,id=scsi0 device + -device scsi-hd,drive=drive0,bus=scsi0.0,scsi-id=0 + -drive id=drive0,file=data-disk.img + + and for multi-process qemu and no libvirt + support (i.e. QEMU forks child processes): + -device lsi53c895a,id=scsi0,rid=0 + -device scsi-hd,drive=drive0,bus=scsi0.0,scsi-id=0,rid=0 + +* The command-line options for the remote process are added to the "command" + suboption of the newly added "-remote" option. + + -remote [socket],rid=0,exec="...",command="..." + + The drives to be emulated by the remote process are specified as part of + this command sub-option. The device to be used to connect to the monitor + is also specified as part of this suboption. + + For example, the following option adds a drive and monitor to the remote + process: + -remote rid=0,exec="qemu-scsi-dev",command="-drive id=drive0,,file=data-disk.img -monitor unix:/home/qmp-sock,,server,,nowait" + + Note: There's an issue with this "command" sub-option which we are in the + process of fixing. To work around this issue, it requires additional + "comma" characters as illustrated above, and in the example below. + +* Example QEMU command-line to launch lsi53c895a in a remote process + + #/bin/sh + qemu-system-x86_64 \ + -name "OL7.4" \ + -machine q35,accel=kvm \ + -smp sockets=1,cores=1,threads=1 \ + -cpu host \ + -m 2048 \ + -object memory-backend-file,id=mem,mem-path=/dev/shm/,size=2G,share=on \ + -numa node,memdev=mem \ + -device virtio-scsi-pci,id=virtio_scsi_pci0 \ + -drive id=drive_image1,if=none,format=raw,file=/root/ol7.qcow2 \ + -device scsi-hd,id=image1,drive=drive_image1,bus=virtio_scsi_pci0.0 \ + -boot d \ + -monitor stdio \ + -vnc :0 \ + -device lsi53c895a,id=lsi0,remote,rid=8,command="qemu-scsi-dev" \ + -device scsi-hd,id=drive2,drive=drive_image2,bus=lsi0.0,scsi-id=0,remote,rid=8,command="qemu-scsi-dev"\ + -remote rid=8,exec="qemu-scsi-dev",command="-drive id=drive_image2,,file=/root/remote-process-disk.img -monitor unix:/home/qmp-sock,,server,,nowait" + + We could connect to the monitor using the following command: + socat /home/qmp-sock stdio + + After hotplugging disks to the remote process, please execute the + following command in the guest to refresh the list of storage devices: + rescan_scsi_bus.sh -a