From patchwork Fri Feb 24 15:54:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 13151464 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 486E5C61DA4 for ; Fri, 24 Feb 2023 15:56:06 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pVaQB-00064k-Ok; Fri, 24 Feb 2023 10:55:43 -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 1pVaPs-0005dO-Dl for qemu-devel@nongnu.org; Fri, 24 Feb 2023 10:55:32 -0500 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 1pVaPo-0005tX-Sg for qemu-devel@nongnu.org; Fri, 24 Feb 2023 10:55:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1677254119; 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: in-reply-to:in-reply-to:references:references; bh=X1C6L9nEFkeUTbPQ7OqGGoSRuulAeUc0p+h0r2E6tCY=; b=LcOMOSG77V02333exn/16BQg5EQvigI0rbHuhYrwO0p7vX1HJU6HCswhTOuBocfznb+/vG /JleixnB1d/6zaZD6jNcBJq5wKuaKVOP/nPsBLC3dyS0SvaWCNTsNAE7OKnPgDitohCtNJ 5bucLFc3FQycrt2x9lsYIm2jjZUONTY= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-654-YMdPMAY9NkSfPHtu4aaVCA-1; Fri, 24 Feb 2023 10:55:17 -0500 X-MC-Unique: YMdPMAY9NkSfPHtu4aaVCA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8C05F3C02528; Fri, 24 Feb 2023 15:55:16 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.85]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9BE20C15BA0; Fri, 24 Feb 2023 15:55:13 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Stefano Garzarella , Shannon Nelson , Jason Wang , Gautam Dawar , Laurent Vivier , alvaro.karsz@solid-run.com, longpeng2@huawei.com, virtualization@lists.linux-foundation.org, Stefan Hajnoczi , Cindy Lu , "Michael S. Tsirkin" , si-wei.liu@oracle.com, Liuxiangdong , Parav Pandit , Eli Cohen , Zhu Lingshan , Harpreet Singh Anand , "Gonglei (Arei)" , Lei Yang Subject: [PATCH v4 10/15] vdpa: disable RAM block discard only for the first device Date: Fri, 24 Feb 2023 16:54:33 +0100 Message-Id: <20230224155438.112797-11-eperezma@redhat.com> In-Reply-To: <20230224155438.112797-1-eperezma@redhat.com> References: <20230224155438.112797-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.133.124; 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 Although it does not make a big difference, its more correct and simplifies the cleanup path in subsequent patches. Move ram_block_discard_disable(false) call to the top of vhost_vdpa_cleanup because: * We cannot use vhost_vdpa_first_dev after dev->opaque = NULL assignment. * Improve the stack order in cleanup: since it is the last action taken in init, it should be the first at cleanup. Signed-off-by: Eugenio Pérez --- hw/virtio/vhost-vdpa.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 71e3dc21fe..27655e7582 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -431,16 +431,6 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp) trace_vhost_vdpa_init(dev, opaque); int ret; - /* - * Similar to VFIO, we end up pinning all guest memory and have to - * disable discarding of RAM. - */ - ret = ram_block_discard_disable(true); - if (ret) { - error_report("Cannot set discarding of RAM broken"); - return ret; - } - v = opaque; v->dev = dev; dev->opaque = opaque ; @@ -452,6 +442,16 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp) return 0; } + /* + * Similar to VFIO, we end up pinning all guest memory and have to + * disable discarding of RAM. + */ + ret = ram_block_discard_disable(true); + if (ret) { + error_report("Cannot set discarding of RAM broken"); + return ret; + } + vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER); @@ -577,12 +577,15 @@ static int vhost_vdpa_cleanup(struct vhost_dev *dev) assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA); v = dev->opaque; trace_vhost_vdpa_cleanup(dev, v); + if (vhost_vdpa_first_dev(dev)) { + ram_block_discard_disable(false); + } + vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); memory_listener_unregister(&v->listener); vhost_vdpa_svq_cleanup(dev); dev->opaque = NULL; - ram_block_discard_disable(false); return 0; }