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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ADFC6C4338F for ; Wed, 4 Aug 2021 08:50:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C67F60E97 for ; Wed, 4 Aug 2021 08:50:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236756AbhHDIun (ORCPT ); Wed, 4 Aug 2021 04:50:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236729AbhHDIul (ORCPT ); Wed, 4 Aug 2021 04:50:41 -0400 Received: from mail-ej1-x62b.google.com (mail-ej1-x62b.google.com [IPv6:2a00:1450:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3ED31C06179A for ; Wed, 4 Aug 2021 01:50:29 -0700 (PDT) Received: by mail-ej1-x62b.google.com with SMTP id o5so2651252ejy.2 for ; Wed, 04 Aug 2021 01:50:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=gjv7zGBiOnBZ7R9UWN2FDc0uyzBBQAiVLX2gQfI9hbk=; b=l6R1WjH+4TvXCxQRV3Evo+qKJY9IwKeaU2/GN2OEK0HHsPbokpR9AjUerM1yTM9Q5T CxH5ACTGqUwfghoCSllUxvZ/0SBHv6pWqZlJb385Y3DQxSEii/Wf5nBiQbShhzECbpin cpY6mbZ3Z33l/D7+pGyhjVq7QQzW2cxI6vhlJe/nTWHXIgWWIyAQm3yguGiBf0UcH+0n K587F3FpiCWTzcW+7JoKaS4zkkVV6ZHsL4gqzHOGtYESD9rGxW+SZGaZtkXLGveyl4yV GplFA6qhA18rWIw2ORUS31gh+PT2kczw3tljSbIsPT3a9IS+GyDAeD6tHDzkfeRJGh+6 RMsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=gjv7zGBiOnBZ7R9UWN2FDc0uyzBBQAiVLX2gQfI9hbk=; b=sd3P2exXjr81+cvBkymls6PRbyhSPCnOgz6xgITzHFXkYOIeZczvijxeP0uKg7r1nU stUda0Cv4XTX5yUlfDfT1mPdclIDrMGGYgnQlXAGOjCKp5Ma4wuPJrr3K8JeWY5ZOMyy xj1Z8x9eQZz55FaWT+Apj6qrAXEtqJVGbg3wHgOSopY+OS7+ZXEU5QsieMIvLMrHe2NO mP/GQThXuQtzATXdIBaoteQujZB0JN+V4rutp4Xsj89IbDOvmWiYm6O2qh6GFkzXtjpP SV+4Q0CNI9dXD1/JyO8s1kTVUQBTCp8vhYb+PRNypTjtAhAoor9MjQk0OMkuquBSVQpc O/Sg== X-Gm-Message-State: AOAM531qHEX/7TdIowbUBfaJI6l14vm5DwU2n9Qc5DQT9d1cqfqiGWwV QWkcMf9L/pCGkqSaAHqVrex0OsC1AT+Ps6/4MjzC X-Google-Smtp-Source: ABdhPJw9DdRo5GKyuQLnCIkhXlDgxjvKjGN8bxXqI6CDfUKxXZQ0BXWfJJMjYdrbOclRuL7SEzvU5j3XL9DXCsmksZ8= X-Received: by 2002:a17:906:46d4:: with SMTP id k20mr24791725ejs.395.1628067027711; Wed, 04 Aug 2021 01:50:27 -0700 (PDT) MIME-Version: 1.0 References: <20210729073503.187-1-xieyongji@bytedance.com> <20210729073503.187-11-xieyongji@bytedance.com> <6bb6c689-e6dd-cfa2-094b-a0ca4258aded@redhat.com> In-Reply-To: From: Yongji Xie Date: Wed, 4 Aug 2021 16:50:16 +0800 Message-ID: Subject: Re: [PATCH v10 10/17] virtio: Handle device reset failure in register_virtio_device() To: Jason Wang Cc: "Michael S. Tsirkin" , Stefan Hajnoczi , Stefano Garzarella , Parav Pandit , Christoph Hellwig , Christian Brauner , Randy Dunlap , Matthew Wilcox , Al Viro , Jens Axboe , bcrl@kvack.org, Jonathan Corbet , =?UTF-8?Q?Mika_Penttil=C3=A4?= , Dan Carpenter , joro@8bytes.org, Greg KH , He Zhe , Liu Xiaodong , Joe Perches , songmuchun@bytedance.com, virtualization , netdev@vger.kernel.org, kvm , linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 4, 2021 at 4:32 PM Jason Wang wrote: > > > =E5=9C=A8 2021/8/3 =E4=B8=8B=E5=8D=885:38, Yongji Xie =E5=86=99=E9=81=93: > > On Tue, Aug 3, 2021 at 4:09 PM Jason Wang wrote: > >> > >> =E5=9C=A8 2021/7/29 =E4=B8=8B=E5=8D=883:34, Xie Yongji =E5=86=99=E9=81= =93: > >>> The device reset may fail in virtio-vdpa case now, so add checks to > >>> its return value and fail the register_virtio_device(). > >> > >> So the reset() would be called by the driver during remove as well, or > >> is it sufficient to deal only with the reset during probe? > >> > > Actually there is no way to handle failure during removal. And it > > should be safe with the protection of software IOTLB even if the > > reset() fails. > > > > Thanks, > > Yongji > > > If this is true, does it mean we don't even need to care about reset > failure? > But we need to handle the failure in the vhost-vdpa case, isn't it? Thanks, Yongji