From patchwork Wed Oct 4 01:45:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 13408197 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 86092E8FDC5 for ; Wed, 4 Oct 2023 01:46:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qnqxN-0000ud-Hi; Tue, 03 Oct 2023 21:45:45 -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 1qnqxK-0000tv-Ea for qemu-devel@nongnu.org; Tue, 03 Oct 2023 21:45:44 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qnqxI-0003RD-Qm for qemu-devel@nongnu.org; Tue, 03 Oct 2023 21:45:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696383938; 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=A3wWVFUtRkwp8e4Vugo3pTBTI8IbjkvEy7wc+9sRSLU=; b=TIQhqdW/DA5fd5hNimCstgmZu/2p8S1LstX/PweDiLc4iKLKlEralgk717g2j0FMlbEtNq skItsj+3EITuXpHOaQApQRc9yfNd2xH5SKHt/E6Wcfw2K40MV19v4VkyHtL/5SSWD+1qra eHZ73yUsvJw2+qzMj13wwlnJTSsMuaY= 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-542-mO10QrLbOq2bidsN5BNSEA-1; Tue, 03 Oct 2023 21:45:35 -0400 X-MC-Unique: mO10QrLbOq2bidsN5BNSEA-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E2E01185A79B; Wed, 4 Oct 2023 01:45:34 +0000 (UTC) Received: from localhost (unknown [10.39.192.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4CE5E493113; Wed, 4 Oct 2023 01:45:34 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Paolo Bonzini , Fam Zheng , hreitz@redhat.com, =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Thomas Huth , Raphael Norwitz , =?utf-8?q?Philippe_Mathieu-D?= =?utf-8?q?aud=C3=A9?= , eperezma@redhat.com, =?utf-8?q?D?= =?utf-8?q?aniel_P=2E_Berrang=C3=A9?= , Stefan Hajnoczi Subject: [PATCH v2 0/3] vhost: clean up device reset Date: Tue, 3 Oct 2023 21:45:29 -0400 Message-ID: <20231004014532.1228637-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@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_H3=0.001, RCVD_IN_MSPIKE_WL=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 v2: - Fix compilation error when vhost is not built [Michael] Stateful vhost devices may need to free resources or clear device state upon device reset. The vhost-user protocol has a VHOST_USER_RESET_DEVICE message for this and vDPA has SET_STATUS 0, but only QEMU's vhost-user-scsi device actually implements this today. This patch series performs device reset across all device types. When virtio_reset() is called, the associated vhost_dev's ->vhost_reset_device() is called. vhost-user-scsi's one-off implementation is obsoleted and removed. This patch affects behavior as follows: - vhost-kernel: no change in behavior. No ioctl calls are made. - vhost-user: back-ends that negotiate VHOST_USER_PROTOCOL_F_RESET_DEVICE now receive a VHOST_USER_DEVICE_RESET message upon device reset. Otherwise there is no change in behavior. DPDK, SPDK, libvhost-user, and the vhost-user-backend crate do not negotiate VHOST_USER_PROTOCOL_F_RESET_DEVICE automatically. - vhost-vdpa: an extra SET_STATUS 0 call is made during device reset. I have tested this series with vhost-net (kernel), vhost-user-blk, and vhost-user-fs (both Rust and legacy C). Stefan Hajnoczi (3): vhost-user: do not send RESET_OWNER on device reset vhost-backend: remove vhost_kernel_reset_device() virtio: call ->vhost_reset_device() during reset meson.build | 1 + include/hw/virtio/vhost.h | 10 ++++++++++ hw/scsi/vhost-user-scsi.c | 20 -------------------- hw/virtio/vhost-backend.c | 6 ------ hw/virtio/vhost-user.c | 13 +++++++++---- hw/virtio/vhost.c | 9 +++++++++ hw/virtio/virtio.c | 4 ++++ 7 files changed, 33 insertions(+), 30 deletions(-) Reviewed-by: Raphael Norwitz