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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 6BF26C433EF for ; Mon, 6 Sep 2021 05:55:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 407C760F92 for ; Mon, 6 Sep 2021 05:55:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238796AbhIFF4C (ORCPT ); Mon, 6 Sep 2021 01:56:02 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:27920 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229475AbhIFF4B (ORCPT ); Mon, 6 Sep 2021 01:56:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630907696; 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: in-reply-to:in-reply-to:references:references; bh=uXUj74/nW7Dop13kd56Tk5oKTffqICUe0M10X4WaPl4=; b=GUdZ1eZQlzCOGh1NwV8LtGH2T8rzYVbjGWgYpiIJXoRpQ92bQe12hhNowOqoFXtPMxzW5u aP3PYHxyAmwSjUySiwvrIceX1TPdj2cz/H7djZxQi1eHPdnARmD4QnZmPJUGR8BF2LTKWC 5MAZc/xWES7JWGitNVqcR86RsKXi2zg= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-46-IUWy8nRbMVOWvM3WB9cROg-1; Mon, 06 Sep 2021 01:54:55 -0400 X-MC-Unique: IUWy8nRbMVOWvM3WB9cROg-1 Received: by mail-wr1-f71.google.com with SMTP id n18-20020adfe792000000b00156ae576abdso848780wrm.9 for ; Sun, 05 Sep 2021 22:54:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=uXUj74/nW7Dop13kd56Tk5oKTffqICUe0M10X4WaPl4=; b=o3HeEbekB31k916jChlt3rHLBb1TEmM8cB+oYbB4zZKpIzSwdA19yJozC3db5ORtpr 3fusX8utQTnpX+IuFb6P9+Yf7hjsLfHgmsmY5EAfn4I2Dztb7GrguA2KZXYpXsXuvmlX FZc23H9JVbzjxPja/l7Y6pomUx2yNXVFiZ9y8bogK6NVvXfRXPLuJeieS7awCedSFO23 7dNO+ptQOrXbWRNrqUxUY9U0GF8p+YBE/QlQlSqAmEFKqQv16U0i1G+W+qZpiLgxLeNG 2B8iRkqYjyy0DBkXhwSlLp+uzkQVJ84OdwQx3jra448X9lt4aPa5Qibf0Q8qrZszavNm RNkQ== X-Gm-Message-State: AOAM531HP5QchBuKUBoGdfHFhUIx6icuVu0NuEJFKwmhV+fkRanQMUnh 7oN2d82R8SdYk6bhM5sC/BkRF42nljrmcGKicL+RJ2/vKaEvq05etRbSE03VZQzAItWkRSC9DR+ Jq5rcBpwWrr1W X-Received: by 2002:adf:c14c:: with SMTP id w12mr11478519wre.115.1630907694586; Sun, 05 Sep 2021 22:54:54 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzR1O2bgM/VI9yvbWaSh3BRtvaI+DJ+X6rHFaklEn67szHR3xlYEE2NCPwCA7NsX4rJPFqdkg== X-Received: by 2002:adf:c14c:: with SMTP id w12mr11478480wre.115.1630907694360; Sun, 05 Sep 2021 22:54:54 -0700 (PDT) Received: from redhat.com ([2.55.131.183]) by smtp.gmail.com with ESMTPSA id h8sm6166143wmb.35.2021.09.05.22.54.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Sep 2021 22:54:53 -0700 (PDT) Date: Mon, 6 Sep 2021 01:54:46 -0400 From: "Michael S. Tsirkin" To: Xie Yongji Cc: jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, mika.penttila@nextfour.com, dan.carpenter@oracle.com, joro@8bytes.org, gregkh@linuxfoundation.org, zhe.he@windriver.com, xiaodong.liu@intel.com, joe@perches.com, robin.murphy@arm.com, will@kernel.org, john.garry@huawei.com, songmuchun@bytedance.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v12 05/13] vdpa: Add reset callback in vdpa_config_ops Message-ID: <20210906015243-mutt-send-email-mst@kernel.org> References: <20210830141737.181-1-xieyongji@bytedance.com> <20210830141737.181-6-xieyongji@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210830141737.181-6-xieyongji@bytedance.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, Aug 30, 2021 at 10:17:29PM +0800, Xie Yongji wrote: > This adds a new callback to support device specific reset > behavior. The vdpa bus driver will call the reset function > instead of setting status to zero during resetting. > > Signed-off-by: Xie Yongji This does gloss over a significant change though: > @@ -348,12 +352,12 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) > return vdev->dma_dev; > } > > -static inline void vdpa_reset(struct vdpa_device *vdev) > +static inline int vdpa_reset(struct vdpa_device *vdev) > { > const struct vdpa_config_ops *ops = vdev->config; > > vdev->features_valid = false; > - ops->set_status(vdev, 0); > + return ops->reset(vdev); > } > > static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) Unfortunately this breaks virtio_vdpa: static void virtio_vdpa_reset(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); vdpa_reset(vdpa); } and there's no easy way to fix this, kernel can't recover from a reset failure e.g. during driver unbind. Find a way to disable virtio_vdpa for now? > -- > 2.11.0