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=-15.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 CD29EC433DB for ; Mon, 1 Feb 2021 05:43:45 +0000 (UTC) Received: from silver.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 7399164E15 for ; Mon, 1 Feb 2021 05:43:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7399164E15 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 38D102002B; Mon, 1 Feb 2021 05:43:45 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GiyAdWyT9SN4; Mon, 1 Feb 2021 05:43:44 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id DF2EA20022; Mon, 1 Feb 2021 05:43:43 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B9E9EC0FA7; Mon, 1 Feb 2021 05:43:43 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 2AF28C013A for ; Mon, 1 Feb 2021 05:43:42 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 0D6EC20026 for ; Mon, 1 Feb 2021 05:43:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A2QJaYX-1xUd for ; Mon, 1 Feb 2021 05:43:40 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by silver.osuosl.org (Postfix) with ESMTPS id 855F820022 for ; Mon, 1 Feb 2021 05:43:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612158219; 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=5ZTIT6r9DAQKDIN9nnIQ8ksj8MiamUBCd7gKXxENqMM=; b=XCzlEu3hK7GvM6DDgPe8vljYPL5CEpzkg/2fqgBUbg/ZZ3nxPXRP1sUFvg74imqARFv9qN qDIKSHTvm7QY39Y5ESGqgcBNkvjgI9bbE2wuBHAoExoZfGNKBJLnnkCTCYr/OaSMSbfLCH 0mx/HfiWJohroh3ccGssby0kEg3pAKo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-452-Ovnzy_d2OluYL-XINZbruw-1; Mon, 01 Feb 2021 00:43:35 -0500 X-MC-Unique: Ovnzy_d2OluYL-XINZbruw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 13FBE18C89DE; Mon, 1 Feb 2021 05:43:34 +0000 (UTC) Received: from [10.72.13.120] (ovpn-13-120.pek2.redhat.com [10.72.13.120]) by smtp.corp.redhat.com (Postfix) with ESMTP id CC16227C42; Mon, 1 Feb 2021 05:43:24 +0000 (UTC) Subject: Re: [PATCH RFC v2 04/10] vringh: implement vringh_kiov_advance() To: Stefano Garzarella , virtualization@lists.linux-foundation.org References: <20210128144127.113245-1-sgarzare@redhat.com> <20210128144127.113245-5-sgarzare@redhat.com> From: Jason Wang Message-ID: <78247eb0-8e6e-f2fa-a693-1b0f14db61dd@redhat.com> Date: Mon, 1 Feb 2021 13:43:23 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210128144127.113245-5-sgarzare@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Cc: Laurent Vivier , Max Gurtovoy , kvm@vger.kernel.org, "Michael S. Tsirkin" , linux-kernel@vger.kernel.org, Xie Yongji , Stefan Hajnoczi 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" Ck9uIDIwMjEvMS8yOCDkuIvljYgxMDo0MSwgU3RlZmFubyBHYXJ6YXJlbGxhIHdyb3RlOgo+IElu IHNvbWUgY2FzZXMsIGl0IG1heSBiZSB1c2VmdWwgdG8gcHJvdmlkZSBhIHdheSB0byBza2lwIGEg bnVtYmVyCj4gb2YgYnl0ZXMgaW4gYSB2cmluZ2hfa2lvdi4KPgo+IExldCdzIGltcGxlbWVudCB2 cmluZ2hfa2lvdl9hZHZhbmNlKCkgZm9yIHRoaXMgcHVycG9zZSwgcmV1c2luZyB0aGUKPiBjb2Rl IGZyb20gdnJpbmdoX2lvdl94ZmVyKCkuCj4gV2UgcmVwbGFjZSB0aGF0IGNvZGUgY2FsbGluZyB0 aGUgbmV3IHZyaW5naF9raW92X2FkdmFuY2UoKS4KCgpBY2tlZC1ieTogSmFzb24gV2FuZyA8amFz b3dhbmdAcmVkaGF0LmNvbT4KCkluIHRoZSBsb25nIHJ1biB3ZSBuZWVkIHRvIHN3aXRjaCB0byB1 c2UgaW92IGl0ZXJhdG9yIGxpYnJhcnkgaW5zdGVhZC4KClRoYW5rcwoKCj4KPiBTaWduZWQtb2Zm LWJ5OiBTdGVmYW5vIEdhcnphcmVsbGEgPHNnYXJ6YXJlQHJlZGhhdC5jb20+Cj4gLS0tCj4gICBp bmNsdWRlL2xpbnV4L3ZyaW5naC5oIHwgIDIgKysKPiAgIGRyaXZlcnMvdmhvc3QvdnJpbmdoLmMg fCA0MSArKysrKysrKysrKysrKysrKysrKysrKysrKysrKy0tLS0tLS0tLS0tLQo+ICAgMiBmaWxl cyBjaGFuZ2VkLCAzMSBpbnNlcnRpb25zKCspLCAxMiBkZWxldGlvbnMoLSkKPgo+IGRpZmYgLS1n aXQgYS9pbmNsdWRlL2xpbnV4L3ZyaW5naC5oIGIvaW5jbHVkZS9saW51eC92cmluZ2guaAo+IGlu ZGV4IDljMDc3ODYzYzhmNi4uNzU1MjExZWJkMTk1IDEwMDY0NAo+IC0tLSBhL2luY2x1ZGUvbGlu dXgvdnJpbmdoLmgKPiArKysgYi9pbmNsdWRlL2xpbnV4L3ZyaW5naC5oCj4gQEAgLTE5OSw2ICsx OTksOCBAQCBzdGF0aWMgaW5saW5lIHZvaWQgdnJpbmdoX2tpb3ZfY2xlYW51cChzdHJ1Y3QgdnJp bmdoX2tpb3YgKmtpb3YpCj4gICAJa2lvdi0+aW92ID0gTlVMTDsKPiAgIH0KPiAgIAo+ICt2b2lk IHZyaW5naF9raW92X2FkdmFuY2Uoc3RydWN0IHZyaW5naF9raW92ICpraW92LCBzaXplX3QgbGVu KTsKPiArCj4gICBpbnQgdnJpbmdoX2dldGRlc2Nfa2VybihzdHJ1Y3QgdnJpbmdoICp2cmgsCj4g ICAJCQlzdHJ1Y3QgdnJpbmdoX2tpb3YgKnJpb3YsCj4gICAJCQlzdHJ1Y3QgdnJpbmdoX2tpb3Yg Kndpb3YsCj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvdmhvc3QvdnJpbmdoLmMgYi9kcml2ZXJzL3Zo b3N0L3ZyaW5naC5jCj4gaW5kZXggYmVlNjNkNjgyMDFhLi40ZDgwMGU0ZjMxY2EgMTAwNjQ0Cj4g LS0tIGEvZHJpdmVycy92aG9zdC92cmluZ2guYwo+ICsrKyBiL2RyaXZlcnMvdmhvc3QvdnJpbmdo LmMKPiBAQCAtNzUsNiArNzUsMzQgQEAgc3RhdGljIGlubGluZSBpbnQgX192cmluZ2hfZ2V0X2hl YWQoY29uc3Qgc3RydWN0IHZyaW5naCAqdnJoLAo+ICAgCXJldHVybiBoZWFkOwo+ICAgfQo+ICAg Cj4gKy8qKgo+ICsgKiB2cmluZ2hfa2lvdl9hZHZhbmNlIC0gc2tpcCBieXRlcyBmcm9tIHZyaW5n X2tpb3YKPiArICogQGlvdjogYW4gaW92IHBhc3NlZCB0byB2cmluZ2hfZ2V0ZGVzY18qKCkgKHVw ZGF0ZWQgYXMgd2UgY29uc3VtZSkKPiArICogQGxlbjogdGhlIG1heGltdW0gbGVuZ3RoIHRvIGFk dmFuY2UKPiArICovCj4gK3ZvaWQgdnJpbmdoX2tpb3ZfYWR2YW5jZShzdHJ1Y3QgdnJpbmdoX2tp b3YgKmlvdiwgc2l6ZV90IGxlbikKPiArewo+ICsJd2hpbGUgKGxlbiAmJiBpb3YtPmkgPCBpb3Yt PnVzZWQpIHsKPiArCQlzaXplX3QgcGFydGxlbiA9IG1pbihpb3YtPmlvdltpb3YtPmldLmlvdl9s ZW4sIGxlbik7Cj4gKwo+ICsJCWlvdi0+Y29uc3VtZWQgKz0gcGFydGxlbjsKPiArCQlpb3YtPmlv dltpb3YtPmldLmlvdl9sZW4gLT0gcGFydGxlbjsKPiArCQlpb3YtPmlvdltpb3YtPmldLmlvdl9i YXNlICs9IHBhcnRsZW47Cj4gKwo+ICsJCWlmICghaW92LT5pb3ZbaW92LT5pXS5pb3ZfbGVuKSB7 Cj4gKwkJCS8qIEZpeCB1cCBvbGQgaW92IGVsZW1lbnQgdGhlbiBpbmNyZW1lbnQuICovCj4gKwkJ CWlvdi0+aW92W2lvdi0+aV0uaW92X2xlbiA9IGlvdi0+Y29uc3VtZWQ7Cj4gKwkJCWlvdi0+aW92 W2lvdi0+aV0uaW92X2Jhc2UgLT0gaW92LT5jb25zdW1lZDsKPiArCj4gKwkJCWlvdi0+Y29uc3Vt ZWQgPSAwOwo+ICsJCQlpb3YtPmkrKzsKPiArCQl9Cj4gKwo+ICsJCWxlbiAtPSBwYXJ0bGVuOwo+ ICsJfQo+ICt9Cj4gK0VYUE9SVF9TWU1CT0wodnJpbmdoX2tpb3ZfYWR2YW5jZSk7Cj4gKwo+ICAg LyogQ29weSBzb21lIGJ5dGVzIHRvL2Zyb20gdGhlIGlvdmVjLiAgUmV0dXJucyBudW0gY29waWVk LiAqLwo+ICAgc3RhdGljIGlubGluZSBzc2l6ZV90IHZyaW5naF9pb3ZfeGZlcihzdHJ1Y3QgdnJp bmdoICp2cmgsCj4gICAJCQkJICAgICAgc3RydWN0IHZyaW5naF9raW92ICppb3YsCj4gQEAgLTk1 LDE5ICsxMjMsOCBAQCBzdGF0aWMgaW5saW5lIHNzaXplX3QgdnJpbmdoX2lvdl94ZmVyKHN0cnVj dCB2cmluZ2ggKnZyaCwKPiAgIAkJZG9uZSArPSBwYXJ0bGVuOwo+ICAgCQlsZW4gLT0gcGFydGxl bjsKPiAgIAkJcHRyICs9IHBhcnRsZW47Cj4gLQkJaW92LT5jb25zdW1lZCArPSBwYXJ0bGVuOwo+ IC0JCWlvdi0+aW92W2lvdi0+aV0uaW92X2xlbiAtPSBwYXJ0bGVuOwo+IC0JCWlvdi0+aW92W2lv di0+aV0uaW92X2Jhc2UgKz0gcGFydGxlbjsKPiAgIAo+IC0JCWlmICghaW92LT5pb3ZbaW92LT5p XS5pb3ZfbGVuKSB7Cj4gLQkJCS8qIEZpeCB1cCBvbGQgaW92IGVsZW1lbnQgdGhlbiBpbmNyZW1l bnQuICovCj4gLQkJCWlvdi0+aW92W2lvdi0+aV0uaW92X2xlbiA9IGlvdi0+Y29uc3VtZWQ7Cj4g LQkJCWlvdi0+aW92W2lvdi0+aV0uaW92X2Jhc2UgLT0gaW92LT5jb25zdW1lZDsKPiAtCj4gLQkJ CQo+IC0JCQlpb3YtPmNvbnN1bWVkID0gMDsKPiAtCQkJaW92LT5pKys7Cj4gLQkJfQo+ICsJCXZy aW5naF9raW92X2FkdmFuY2UoaW92LCBwYXJ0bGVuKTsKPiAgIAl9Cj4gICAJcmV0dXJuIGRvbmU7 Cj4gICB9CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpW aXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlzdHMubGludXgtZm91 bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlz dGluZm8vdmlydHVhbGl6YXRpb24=