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=-9.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 775A2C49EAB for ; Mon, 28 Jun 2021 04:40:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 57E7A61C2F for ; Mon, 28 Jun 2021 04:40:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232131AbhF1Emy (ORCPT ); Mon, 28 Jun 2021 00:42:54 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:31692 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230203AbhF1Emw (ORCPT ); Mon, 28 Jun 2021 00:42:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624855227; 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=AHA+LCiynBinIcwBex84PZFjkFyKiA5ldfw47X4q5zo=; b=XEmpiDo0AGOPA8jMZyl0Pxe8y6IEpHAzegq/jALcVN4tqeidsHKJgXqK7GmYbeYDpZGR0a DekUa1GgA4AImOtWhtdcysWpKzCyKY7hARoEuiuk5y8k+no66nT6gPwMRdG/rXngA+j+xj ZWZ14iv+68EEarUOHhoLg8e+MhwR2yw= Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-512-a4zIZsEuNau9rqlPJ1FSDA-1; Mon, 28 Jun 2021 00:40:25 -0400 X-MC-Unique: a4zIZsEuNau9rqlPJ1FSDA-1 Received: by mail-pf1-f198.google.com with SMTP id s207-20020a6277d80000b0290300944a8bd2so8602002pfc.16 for ; Sun, 27 Jun 2021 21:40:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=AHA+LCiynBinIcwBex84PZFjkFyKiA5ldfw47X4q5zo=; b=FVDzHVQdVHxfImwVVC5n3nJ0s3+X7wYB482ZFOEonfnKA8MXeQlAZ7NmrUnXK/MRSl 8CsdreCL+3sLZSkHl0aIaRDLLXWsouUqpX3gUzSeznIifuW4yHnI7jGr5KOaro+nHXX8 bvQV4D+9XY0PQrlnuenlLf8cSKYEd5n5zu/xiy24iH9CNXed76B762zJixAJElCvW3He cebGXV5u7AwWuFdJevM81er7ynjUlx6qxpGCGHYUlv1qAeL1Ewm/AOnYqFKdsSIkVax7 R2jlqmqoHovxRyQLNF31vaycK80c1N1vmQ554XX6eP0nfYeX5KGNg4RaUmgqHm3WPrMm J6DQ== X-Gm-Message-State: AOAM533VZgo0ZVxsH1DVnczPGb39vZaMK/8XjhT3KXbnl3/x4UkrDwqX d2ywniVs7EKvw/H4G19k2qNUaT+NzK329cHplLO5Kr0V+fWA/hus0r0FXZU97QqoXXWOLNTyRod OMIqBe3rThGXCDQPdRiRjXjOMVvR0Cfne6OT9bCTaD9rHuJhyhBV8RZl0aeRtp4/OZfUETazrV8 9h X-Received: by 2002:a17:90a:73ca:: with SMTP id n10mr35061295pjk.16.1624855223858; Sun, 27 Jun 2021 21:40:23 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwo0o1s5KBYLlDLTqUhWl2FmmtFdw3BbxmCq5oGFB7ob0lz6rjRGdc+HVA7kjdSm4QccHUIRQ== X-Received: by 2002:a17:90a:73ca:: with SMTP id n10mr35061255pjk.16.1624855223625; Sun, 27 Jun 2021 21:40:23 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id x143sm12654203pfc.6.2021.06.27.21.40.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 27 Jun 2021 21:40:23 -0700 (PDT) Subject: Re: [PATCH v8 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace To: Yongji Xie 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 , songmuchun@bytedance.com, virtualization , netdev@vger.kernel.org, kvm , linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel References: <20210615141331.407-1-xieyongji@bytedance.com> <20210615141331.407-10-xieyongji@bytedance.com> <1bba439f-ffc8-c20e-e8a4-ac73e890c592@redhat.com> <0aeb7cb7-58e5-1a95-d830-68edd7e8ec2e@redhat.com> <48cab125-093b-2299-ff9c-3de8c7c5ed3d@redhat.com> From: Jason Wang Message-ID: Date: Mon, 28 Jun 2021 12:40:14 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 在 2021/6/25 下午12:19, Yongji Xie 写道: >> 2b) for set_status(): simply relay the message to userspace, reply is no >> needed. Userspace will use a command to update the status when the >> datapath is stop. The the status could be fetched via get_stats(). >> >> 2b looks more spec complaint. >> > Looks good to me. And I think we can use the reply of the message to > update the status instead of introducing a new command. > Just notice this part in virtio_finalize_features():         virtio_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);         status = dev->config->get_status(dev);         if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) { So we no reply doesn't work for FEATURES_OK. So my understanding is: 1) We must not use noreply for set_status() 2) We can use noreply for get_status(), but it requires a new ioctl to update the status. So it looks to me we need synchronize for both get_status() and set_status(). Thanks 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=-6.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 CBAF5C49EAF for ; Mon, 28 Jun 2021 04:40:32 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7800B619AD for ; Mon, 28 Jun 2021 04:40:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7800B619AD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; 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Sun, 27 Jun 2021 21:40:23 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id x143sm12654203pfc.6.2021.06.27.21.40.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 27 Jun 2021 21:40:23 -0700 (PDT) Subject: Re: [PATCH v8 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace To: Yongji Xie References: <20210615141331.407-1-xieyongji@bytedance.com> <20210615141331.407-10-xieyongji@bytedance.com> <1bba439f-ffc8-c20e-e8a4-ac73e890c592@redhat.com> <0aeb7cb7-58e5-1a95-d830-68edd7e8ec2e@redhat.com> <48cab125-093b-2299-ff9c-3de8c7c5ed3d@redhat.com> From: Jason Wang Message-ID: Date: Mon, 28 Jun 2021 12:40:14 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Cc: kvm , "Michael S. Tsirkin" , virtualization , Christian Brauner , Jonathan Corbet , joro@8bytes.org, Matthew Wilcox , Christoph Hellwig , Dan Carpenter , Al Viro , Stefan Hajnoczi , songmuchun@bytedance.com, Jens Axboe , Greg KH , Randy Dunlap , linux-kernel , iommu@lists.linux-foundation.org, bcrl@kvack.org, netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, =?UTF-8?Q?Mika_Penttil=c3=a4?= X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" CuWcqCAyMDIxLzYvMjUg5LiL5Y2IMTI6MTksIFlvbmdqaSBYaWUg5YaZ6YGTOgo+PiAyYikgZm9y IHNldF9zdGF0dXMoKTogc2ltcGx5IHJlbGF5IHRoZSBtZXNzYWdlIHRvIHVzZXJzcGFjZSwgcmVw bHkgaXMgbm8KPj4gbmVlZGVkLiBVc2Vyc3BhY2Ugd2lsbCB1c2UgYSBjb21tYW5kIHRvIHVwZGF0 ZSB0aGUgc3RhdHVzIHdoZW4gdGhlCj4+IGRhdGFwYXRoIGlzIHN0b3AuIFRoZSB0aGUgc3RhdHVz IGNvdWxkIGJlIGZldGNoZWQgdmlhIGdldF9zdGF0cygpLgo+Pgo+PiAyYiBsb29rcyBtb3JlIHNw ZWMgY29tcGxhaW50Lgo+Pgo+IExvb2tzIGdvb2QgdG8gbWUuIEFuZCBJIHRoaW5rIHdlIGNhbiB1 c2UgdGhlIHJlcGx5IG9mIHRoZSBtZXNzYWdlIHRvCj4gdXBkYXRlIHRoZSBzdGF0dXMgaW5zdGVh ZCBvZiBpbnRyb2R1Y2luZyBhIG5ldyBjb21tYW5kLgo+CgpKdXN0IG5vdGljZSB0aGlzIHBhcnQg aW4gdmlydGlvX2ZpbmFsaXplX2ZlYXR1cmVzKCk6CgogwqDCoMKgwqDCoMKgwqAgdmlydGlvX2Fk ZF9zdGF0dXMoZGV2LCBWSVJUSU9fQ09ORklHX1NfRkVBVFVSRVNfT0spOwogwqDCoMKgwqDCoMKg wqAgc3RhdHVzID0gZGV2LT5jb25maWctPmdldF9zdGF0dXMoZGV2KTsKIMKgwqDCoMKgwqDCoMKg IGlmICghKHN0YXR1cyAmIFZJUlRJT19DT05GSUdfU19GRUFUVVJFU19PSykpIHsKClNvIHdlIG5v IHJlcGx5IGRvZXNuJ3Qgd29yayBmb3IgRkVBVFVSRVNfT0suCgpTbyBteSB1bmRlcnN0YW5kaW5n IGlzOgoKMSkgV2UgbXVzdCBub3QgdXNlIG5vcmVwbHkgZm9yIHNldF9zdGF0dXMoKQoyKSBXZSBj YW4gdXNlIG5vcmVwbHkgZm9yIGdldF9zdGF0dXMoKSwgYnV0IGl0IHJlcXVpcmVzIGEgbmV3IGlv Y3RsIHRvIAp1cGRhdGUgdGhlIHN0YXR1cy4KClNvIGl0IGxvb2tzIHRvIG1lIHdlIG5lZWQgc3lu Y2hyb25pemUgZm9yIGJvdGggZ2V0X3N0YXR1cygpIGFuZCAKc2V0X3N0YXR1cygpLgoKVGhhbmtz CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KVmlydHVh bGl6YXRpb24gbWFpbGluZyBsaXN0ClZpcnR1YWxpemF0aW9uQGxpc3RzLmxpbnV4LWZvdW5kYXRp b24ub3JnCmh0dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZv L3ZpcnR1YWxpemF0aW9u