From nobody Mon Feb 9 21:40:27 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=oracle.com ARC-Seal: i=1; a=rsa-sha256; t=1608264316; cv=none; d=zohomail.com; s=zohoarc; b=Y48+0ZoySDA2PnPXQsnHQ+wychX3GSNILvRBn+F/utyXyJJ2HGC3gwWVUglckkDznIyJmoWqenAk+cmk/mRfm2XXCUCPBdZwvMyIAaARSGQlQy7nJtv/TfFKvazaolf+436JcGnuYxSXcyJXqOG0Q+cbF8zaxkLgDOOmkeeIsj0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1608264316; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=Nb7cPWfxobkDv/wfuJIw4Z3aNgO7kD0GOAU0aHKRgd4=; b=h4NXYIrmBgRAnh98nKsCWEtLiy0cvaZQuWxM+SMeMpv7wq35Xe2AbfqcJZi2JGR66S/6qkXEeD4gfzzyruyMgbwr5Zc+FqBz+bYHEmzktY3UgzfG5LViDf95/qVjGwHSNe/ZRFtF968WA43uGpBi9jwYw2lvNCs0p7hi9DffpvY= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1608264316960947.9373698934673; Thu, 17 Dec 2020 20:05:16 -0800 (PST) Received: from localhost ([::1]:58710 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kq710-0000xi-Rt for importer@patchew.org; Thu, 17 Dec 2020 23:05:14 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34488) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kq6wq-0006Lq-Gc for qemu-devel@nongnu.org; Thu, 17 Dec 2020 23:00:56 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:60472) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kq6wo-0003x2-2d for qemu-devel@nongnu.org; Thu, 17 Dec 2020 23:00:56 -0500 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0BI3xu9t048615; Fri, 18 Dec 2020 04:00:48 GMT Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2120.oracle.com with ESMTP id 35cntmgfre-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 18 Dec 2020 04:00:48 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0BI3pK9K090223; Fri, 18 Dec 2020 03:58:47 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3030.oracle.com with ESMTP id 35d7ersjp9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 18 Dec 2020 03:58:47 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0BI3wkm6008632; Fri, 18 Dec 2020 03:58:46 GMT Received: from flaka.hsd1.ca.comcast.net (/10.159.131.68) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 17 Dec 2020 19:58:45 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=Nb7cPWfxobkDv/wfuJIw4Z3aNgO7kD0GOAU0aHKRgd4=; b=KTsoyX9XM/hh4GcnbWou1Kt4sNlAVOTRj7dbe+1GXPnxSDrgWm5m7FWcFtX6GR9fcqdY RRugnZMhoBlx7930KHjsPRY46JWzv9aO+8gzFmxQISuYgH0JsBCxd/5fj5cIC6EkNEKM 7TQYZHQsxYp0jslpzzdMhrPcTS/TlfGAcwbW2tcveYicSh2sjQQmCzSX4LY9IR1zIXP0 zozTvkL+032gMcoI4EgQBuZYECuC2KBUrE9Cw7xuFMqSzmHvzjiHO7idA7fYoLsWwQbQ Aurjjm49IEcq54J0G5sL5ULSDb0xhVsiekSjrlynThxdltmft/g3z6OYgmpF9rCGWoKM Gw== From: elena.ufimtseva@oracle.com To: qemu-devel@nongnu.org Subject: [PATCH v14 02/21] multi-process: add configure and usage information Date: Thu, 17 Dec 2020 19:57:49 -0800 Message-Id: <440d33d0add2c9aadbc75416d6c084c2bca0a240.1608263018.git.elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.25.GIT In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9838 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 spamscore=0 bulkscore=0 suspectscore=0 adultscore=0 mlxscore=0 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012180026 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9838 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 impostorscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012180027 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=141.146.126.78; envelope-from=elena.ufimtseva@oracle.com; helo=aserp2120.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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" 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 +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +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=3Dlsi0 = \ + -drive id=3Ddrive_image2,file=3D/build/ol7-nvme-test-1.qcow2 = \ + -device scsi-hd,id=3Ddrive2,drive=3Ddrive_image2,bus=3Dlsi0.0,scsi-i= d=3D0 \ + -object x-remote-object,id=3Drobj1,devid=3Dlsi1,fd=3D4, + +* 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=3Dmem,size=3D2G + + - A "x-pci-proxy-dev" device is created for each of the PCI devices emul= ated + in the remote process. A "socket" sub-option specifies the other end of + unix channel created by orchestrator. The "id" sub-option must be spec= ified + 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=3Dlsi0,socket=3D3 diff --git a/MAINTAINERS b/MAINTAINERS index c8c29a2814..398973ca91 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3168,6 +3168,7 @@ M: Jagannathan Raman M: John G Johnson S: Maintained F: docs/devel/multi-process.rst +F: docs/multi-process.rst =20 Build and test automation ------------------------- --=20 2.25.GIT