From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5C8E6C6FD1C for ; Thu, 23 Mar 2023 19:54:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pfR0s-0003CS-Cg; Thu, 23 Mar 2023 15:54:18 -0400 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 1pfR0q-0003CJ-PU for qemu-devel@nongnu.org; Thu, 23 Mar 2023 15:54:16 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pfR0o-0007PT-PW for qemu-devel@nongnu.org; Thu, 23 Mar 2023 15:54:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1679601253; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=L3qoEbTSvNoTmsKY8awcradxbS1fexqfAkCV6o+r+1g=; b=forXwp4gaP0onz3bE2sV5fmeC3sCJOBWWedOsjd+mFTI6NMTzFbBCnmrT9wzoDMmmtjHli VqcoWNsmDygdjoJlczZwDloGyau16WpyUEEy+gOWOZPD/KRY1ClG3K0Xh4EjPn8qOY8XH0 BeJt+6HQp7uyrghErbTbPuCOiSSrpFQ= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-477-Qej5ZdpbMZWYFMGb35vsRg-1; Thu, 23 Mar 2023 15:54:10 -0400 X-MC-Unique: Qej5ZdpbMZWYFMGb35vsRg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 382128030A0; Thu, 23 Mar 2023 19:54:09 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.193.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id 27315440BC; Thu, 23 Mar 2023 19:54:06 +0000 (UTC) From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Liuxiangdong , Gautam Dawar , Jason Wang , alvaro.karsz@solid-run.com, "Gonglei (Arei)" , Lei Yang , si-wei.liu@oracle.com, Eli Cohen , Shannon Nelson , Laurent Vivier , "Michael S. Tsirkin" , Stefano Garzarella , Parav Pandit , Zhu Lingshan , Cindy Lu , longpeng2@huawei.com, Harpreet Singh Anand Subject: [PATCH for 8.1 v2 0/6] Move ASID test to vhost-vdpa net initialization Date: Thu, 23 Mar 2023 20:53:58 +0100 Message-Id: <20230323195404.1247326-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.129.124; envelope-from=eperezma@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=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org QEMU v8.0.0-rc0 is able to switch dynamically between vhost-vdpa passthroug= h=0D and SVQ mode as long as the net device does not have CVQ. The net device=0D state followed (and migrated) by CVQ requires special care.=0D =0D A pre-requisite to add CVQ to that framework is to determine if devices wit= h=0D CVQ are migratable or not at initialization time. The solution to it is to= =0D always shadow only CVQ, and vq groups and ASID are used for that.=0D =0D However, current qemu version only checks ASID at device start (as "driver = set=0D DRIVER_OK status bit"), not at device initialization. A check at=0D initialization time is required. Otherwise, the guest would be able to set= =0D and remove migration blockers at will [1].=0D =0D This series is a requisite for migration of vhost-vdpa net devices with CVQ= .=0D However it already makes sense by its own, as it reduces the number of ioct= ls=0D at migration time, decreasing the error paths there.=0D =0D [1] https://lore.kernel.org/qemu-devel/2616f0cd-f9e8-d183-ea78-db1be4825d9c= @redhat.com/=0D ---=0D v2:=0D * Take out the reset of the device from vhost_vdpa_cvq_is_isolated=0D (reported by Lei Yang).=0D * Expand patch messages by Stefano G. questions.=0D =0D Eugenio P=C3=A9rez (6):=0D vdpa: Remove status in reset tracing=0D vdpa: add vhost_vdpa_reset_status_fd=0D vdpa: add vhost_vdpa_set_dev_features_fd=0D vdpa: return errno in vhost_vdpa_get_vring_group error=0D vdpa: move CVQ isolation check to net_init_vhost_vdpa=0D vdpa: Cache cvq group in VhostVDPAState=0D =0D include/hw/virtio/vhost-vdpa.h | 2 +=0D hw/virtio/vhost-vdpa.c | 78 ++++++++-----=0D net/vhost-vdpa.c | 199 +++++++++++++++++++++++++++------=0D hw/virtio/trace-events | 2 +-=0D 4 files changed, 221 insertions(+), 60 deletions(-)=0D =0D -- =0D 2.31.1=0D =0D