From patchwork Tue Oct 18 15:53:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 13010802 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 D3362C433FE for ; Tue, 18 Oct 2022 16:15:56 +0000 (UTC) Received: from localhost ([::1]:37938 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1okpFl-00085m-P8 for qemu-devel@archiver.kernel.org; Tue, 18 Oct 2022 12:15:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37160) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1okouw-0003uO-AU for qemu-devel@nongnu.org; Tue, 18 Oct 2022 11:54:11 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:52406) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1okout-00041b-NS for qemu-devel@nongnu.org; Tue, 18 Oct 2022 11:54:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666108443; 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=IxB0BTeh3hMu7aNmM5INY0/5ds3iOeAsqOuJwU1wl/U=; b=cP64VdjPt2xCb951EEHPS15q3xgaZjLcl5cbtR2ft+96RvOoLadD4H1gTWNVNwPLZ3+V0e WJbpzwJdxvbaFmziEjPKTs4dPs3XhM1IgEVR3cz1EbguUHQCB4rjmJ3ndLyCXDFGn1lwAi bbIY/Fpuw35X8Kkqu+ACauZtdkknqzQ= 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-639-pJ2EEKG2Mjq_lPjLMo86mg-1; Tue, 18 Oct 2022 11:54:00 -0400 X-MC-Unique: pJ2EEKG2Mjq_lPjLMo86mg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2E66C101E985; Tue, 18 Oct 2022 15:53:33 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.178]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7773C2166BAD; Tue, 18 Oct 2022 15:53:24 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Si-Wei Liu , Laurent Vivier , Eli Cohen , Gautam Dawar , "Michael S. Tsirkin" , Zhu Lingshan , Harpreet Singh Anand , Liuxiangdong , Cindy Lu , Parav Pandit , Stefano Garzarella , Jason Wang Subject: [RFC PATCH 0/5] Guest announce feature emulation using Shadow VirtQueue Date: Tue, 18 Oct 2022 17:53:16 +0200 Message-Id: <20221018155321.145135-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 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: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.256, 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_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" A gratuitous ARP is recommended after a live migration to reduce the amount of time needed by the network links to be aware of the new location. A hypervisor may not have the knowledge of the guest network configuration, and this is especially true on passthrough devices, so its simpler to ask the guest to do it. However, the device control part of this feature can be totally emulated by qemu and shadow virtqueue, not needing any special feature from the actual vdpa device. Sending as RFC for the moment as VIRTIO_NET_F_STATUS is also needed for the guest to access the status of virtio net config to check if an announcement is needed. Eugenio Pérez (5): vdpa: Save emulated features list in vhost_vdpa vdpa: Remove shadow CVQ command check vdpa: handle VIRTIO_NET_CTRL_ANNOUNCE in vhost_vdpa_net_handle_ctrl_avail vhost_net: return VIRTIO_NET_S_ANNOUNCE is device model has it set vdpa: Offer VIRTIO_NET_F_GUEST_ANNOUNCE feature if SVQ is enabled include/hw/virtio/vhost-vdpa.h | 2 + hw/net/vhost_net.c | 30 ++++++++++++++- hw/virtio/vhost-vdpa.c | 8 ++-- net/vhost-vdpa.c | 70 +++++++++------------------------- 4 files changed, 54 insertions(+), 56 deletions(-)