From nobody Wed Nov 27 02:26:35 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; 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=pass(p=none dis=none) header.from=oracle.com ARC-Seal: i=1; a=rsa-sha256; t=1701975216; cv=none; d=zohomail.com; s=zohoarc; b=lf1vrNoyiPHbUMyUkvENAt/W6s0s/9lhkmgIXwRruIMebXhaQ8vpeQQCP5HZQY/GE73o82KgF4oMWrZN2nVwhsgyCXVfyNk94ljtGduhFHCCgUFuRPxieAcDE9aRpUT3VFc/+mcEZoTeNXXnkGAuIDSs/NYzBshPNGxeSsctgbM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1701975216; h=Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=EthSTSZAGUdFGpGUUgIS40/qu5PWf2EuzefpgEB0S8Y=; b=D/NXyKKAzghxdfVetllnLSqALHsxA6+1rbo77nX+fxTUhoB19mrrMxEkB/thelHQO2HDKdzQcIk1T5HaDLR0BINuHTcy+xptIKARH2b+/1MTatxdnTmqMbm1lpFZ1cWclVGtJdgeXIBdbzAKQVjZ3kVRNKMI0ZQtp4S2y3N2auE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; 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=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1701975216104515.0699353914117; Thu, 7 Dec 2023 10:53:36 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rBJSt-0003xI-4b; Thu, 07 Dec 2023 13:51:15 -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 1rBJSW-0003cS-3y for qemu-devel@nongnu.org; Thu, 07 Dec 2023 13:50:52 -0500 Received: from mx0a-00069f02.pphosted.com ([205.220.165.32]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rBJSO-00075p-Pr for qemu-devel@nongnu.org; Thu, 07 Dec 2023 13:50:48 -0500 Received: from pps.filterd (m0246629.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3B7HVdNu010826; Thu, 7 Dec 2023 18:50:42 GMT Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.appoci.oracle.com [138.1.114.2]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3utdc1cg00-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Dec 2023 18:50:41 +0000 Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 3B7HOJfY039780; Thu, 7 Dec 2023 18:50:41 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3utan7vhyn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Dec 2023 18:50:41 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3B7Io90W008067; Thu, 7 Dec 2023 18:50:40 GMT Received: from ban25x6uut24.us.oracle.com (ban25x6uut24.us.oracle.com [10.153.73.24]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 3utan7vh2k-21; Thu, 07 Dec 2023 18:50:40 +0000 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; s=corp-2023-11-20; bh=EthSTSZAGUdFGpGUUgIS40/qu5PWf2EuzefpgEB0S8Y=; b=fiNpDcI7jkLvuU7c9McRT5f3QPpsAqnKiiZtWmucBPbpUonY3I53aERnM+56LaofjjDn rWsHB5eW2auOaBt55IpF5JNnCwXCTCCnCfHeOQcS8vCtw5sBW3wb63gktQG9hEPfDxpP wKhOC/f84hDWkLyXSW5ULbqIcm/DNnI9vw1XPJKdGADXDTzRJY+xyDyW5f9eaIHhNNqT ysoVQN0Lrn5RWJxTLNQbCqm9i8/UFtiB8stZ3DFwg1CveT4sktaAJZmtKgNbiA/mfUrM 5S0/VWIjL4w8gdQLNd5d94GSxRvc/ABOf0MDMrP6EWyfDUgFeTfJrNJed4X5472sDcmx AQ== From: Si-Wei Liu To: eperezma@redhat.com, jasowang@redhat.com, mst@redhat.com, dtatulea@nvidia.com, leiyang@redhat.com, yin31149@gmail.com, boris.ostrovsky@oracle.com, jonah.palmer@oracle.com Cc: qemu-devel@nongnu.org Subject: [PATCH 20/40] vdpa: avoid mapping flush across reset Date: Thu, 7 Dec 2023 09:39:33 -0800 Message-Id: <1701970793-6865-21-git-send-email-si-wei.liu@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1701970793-6865-1-git-send-email-si-wei.liu@oracle.com> References: <1701970793-6865-1-git-send-email-si-wei.liu@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-07_15,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 spamscore=0 malwarescore=0 suspectscore=0 mlxscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312070156 X-Proofpoint-GUID: W5odj9H8iuFszJ3247q5atcCldSAVR7C X-Proofpoint-ORIG-GUID: W5odj9H8iuFszJ3247q5atcCldSAVR7C 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=205.220.165.32; envelope-from=si-wei.liu@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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 @oracle.com) X-ZM-MESSAGEID: 1701975217295100001 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Leverage the IOTLB_PERSIST and DESC_ASID features to achieve a slightly light weight reset path, without resorting to suspend and resume. Not as best but it offers significant time saving too, which should somehow play its role in live migration down time reduction by large. It benefits two cases: - normal virtio reset in the VM, e.g. guest reboot, don't have to tear down all iotlb mapping and set up again. - SVQ switching, in which data vq's descriptor table and vrings are moved to a different ASID than where its buffers reside. Along with the use of persistent iotlb, it would save substantial time from pinning and mapping unneccessarily when moving descriptors on to or out of shadow mode. Signed-off-by: Si-Wei Liu --- hw/virtio/vhost-vdpa.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 31e0a55..47c764b 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -633,6 +633,7 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void = *opaque, Error **errp) 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH= | 0x1ULL << VHOST_BACKEND_F_IOTLB_ASID | 0x1ULL << VHOST_BACKEND_F_DESC_ASID | + 0x1ULL << VHOST_BACKEND_F_IOTLB_PERSI= ST | 0x1ULL << VHOST_BACKEND_F_SUSPEND; int ret; =20 @@ -1493,8 +1494,6 @@ static void vhost_vdpa_maybe_flush_map(struct vhost_d= ev *dev) =20 static void vhost_vdpa_reset_status(struct vhost_dev *dev) { - struct vhost_vdpa *v =3D dev->opaque; - if (!vhost_vdpa_last_dev(dev)) { return; } @@ -1502,9 +1501,7 @@ static void vhost_vdpa_reset_status(struct vhost_dev = *dev) vhost_vdpa_reset_device(dev); vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER); - memory_listener_unregister(&v->shared->listener); - v->shared->listener_registered =3D false; - + vhost_vdpa_maybe_flush_map(dev); } =20 static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base, --=20 1.8.3.1