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 39938C433E0 for ; Wed, 20 Jan 2021 03:44:40 +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 98D0623110 for ; Wed, 20 Jan 2021 03:44:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 98D0623110 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 170AB204F6; Wed, 20 Jan 2021 03:44:39 +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 xegIZcqMlsSD; Wed, 20 Jan 2021 03:44:38 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id 1A06E20443; Wed, 20 Jan 2021 03:44:38 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 007FFC088B; Wed, 20 Jan 2021 03:44:38 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id A6C27C013A for ; Wed, 20 Jan 2021 03:44:36 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 9BA5E85D90 for ; Wed, 20 Jan 2021 03:44:36 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0ZWzEEtuRCXs for ; Wed, 20 Jan 2021 03:44:36 +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 [216.205.24.124]) by fraxinus.osuosl.org (Postfix) with ESMTPS id EFBA284D2E for ; Wed, 20 Jan 2021 03:44:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611114274; 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=BHJzsbGQ3zxMDMbJJfdomjMvNc/E1eGKV+czPVXzYNc=; b=cU2LU63/dKTtn2SfSQjtJYrVfutH/Pj8vm7EbsjUw1QyGpA9UoDGbpZe5LD9wmvXV0gFW8 403TTatXPPhBHXkiJl9ZaYgSR+pCjashSEMgUod4jSJnP5nFnSVXBcWMR0WkPBSK9r0I4V +r2gUNe94UQxv60f6fL7dnJBBE/i6rI= 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-269-MChJ_65cNhSYzTRY33kfEQ-1; Tue, 19 Jan 2021 22:44:33 -0500 X-MC-Unique: MChJ_65cNhSYzTRY33kfEQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B1D3A800D53; Wed, 20 Jan 2021 03:44:30 +0000 (UTC) Received: from [10.72.13.124] (ovpn-13-124.pek2.redhat.com [10.72.13.124]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8FDF760C9C; Wed, 20 Jan 2021 03:44:19 +0000 (UTC) Subject: Re: [RFC v3 04/11] vhost-vdpa: protect concurrent access to vhost device iotlb To: Xie Yongji , mst@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, bob.liu@oracle.com, hch@infradead.org, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net References: <20210119045920.447-1-xieyongji@bytedance.com> <20210119045920.447-5-xieyongji@bytedance.com> From: Jason Wang Message-ID: <8fbcb4c3-a09a-a00a-97e2-dde0a03be5a9@redhat.com> Date: Wed, 20 Jan 2021 11:44:18 +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: <20210119045920.447-5-xieyongji@bytedance.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Cc: linux-aio@kvack.org, netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org 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" Ck9uIDIwMjEvMS8xOSDkuIvljYgxMjo1OSwgWGllIFlvbmdqaSB3cm90ZToKPiBJbnRyb2R1Y2Ug YSBtdXRleCB0byBwcm90ZWN0IHZob3N0IGRldmljZSBpb3RsYiBmcm9tCj4gY29uY3VycmVudCBh Y2Nlc3MuCj4KPiBGaXhlczogNGM4Y2YzMTgoInZob3N0OiBpbnRyb2R1Y2UgdkRQQS1iYXNlZCBi YWNrZW5kIikKPiBTaWduZWQtb2ZmLWJ5OiBYaWUgWW9uZ2ppIDx4aWV5b25namlAYnl0ZWRhbmNl LmNvbT4KPiAtLS0KPiAgIGRyaXZlcnMvdmhvc3QvdmRwYS5jIHwgNCArKysrCj4gICAxIGZpbGUg Y2hhbmdlZCwgNCBpbnNlcnRpb25zKCspCj4KPiBkaWZmIC0tZ2l0IGEvZHJpdmVycy92aG9zdC92 ZHBhLmMgYi9kcml2ZXJzL3Zob3N0L3ZkcGEuYwo+IGluZGV4IDQ0OGJlNzg3NWI2ZC4uNGEyNDFk MzgwYzQwIDEwMDY0NAo+IC0tLSBhL2RyaXZlcnMvdmhvc3QvdmRwYS5jCj4gKysrIGIvZHJpdmVy cy92aG9zdC92ZHBhLmMKPiBAQCAtNDksNiArNDksNyBAQCBzdHJ1Y3Qgdmhvc3RfdmRwYSB7Cj4g ICAJc3RydWN0IGV2ZW50ZmRfY3R4ICpjb25maWdfY3R4Owo+ICAgCWludCBpbl9iYXRjaDsKPiAg IAlzdHJ1Y3QgdmRwYV9pb3ZhX3JhbmdlIHJhbmdlOwo+ICsJc3RydWN0IG11dGV4IG11dGV4OwoK CkxldCdzIHVzZSB0aGUgZGV2aWNlIG11dGV4IGxpa2Ugd2hhdCB2aG9zdF9wcm9jZXNzX2lvdGxi X21zZygpIGRpZC4KClRoYW5rcwoKCj4gICB9Owo+ICAgCj4gICBzdGF0aWMgREVGSU5FX0lEQSh2 aG9zdF92ZHBhX2lkYSk7Cj4gQEAgLTcyOCw2ICs3MjksNyBAQCBzdGF0aWMgaW50IHZob3N0X3Zk cGFfcHJvY2Vzc19pb3RsYl9tc2coc3RydWN0IHZob3N0X2RldiAqZGV2LAo+ICAgCWlmIChyKQo+ ICAgCQlyZXR1cm4gcjsKPiAgIAo+ICsJbXV0ZXhfbG9jaygmdi0+bXV0ZXgpOwo+ICAgCXN3aXRj aCAobXNnLT50eXBlKSB7Cj4gICAJY2FzZSBWSE9TVF9JT1RMQl9VUERBVEU6Cj4gICAJCXIgPSB2 aG9zdF92ZHBhX3Byb2Nlc3NfaW90bGJfdXBkYXRlKHYsIG1zZyk7Cj4gQEAgLTc0Nyw2ICs3NDks NyBAQCBzdGF0aWMgaW50IHZob3N0X3ZkcGFfcHJvY2Vzc19pb3RsYl9tc2coc3RydWN0IHZob3N0 X2RldiAqZGV2LAo+ICAgCQlyID0gLUVJTlZBTDsKPiAgIAkJYnJlYWs7Cj4gICAJfQo+ICsJbXV0 ZXhfdW5sb2NrKCZ2LT5tdXRleCk7Cj4gICAKPiAgIAlyZXR1cm4gcjsKPiAgIH0KPiBAQCAtMTAx Nyw2ICsxMDIwLDcgQEAgc3RhdGljIGludCB2aG9zdF92ZHBhX3Byb2JlKHN0cnVjdCB2ZHBhX2Rl dmljZSAqdmRwYSkKPiAgIAkJcmV0dXJuIG1pbm9yOwo+ICAgCX0KPiAgIAo+ICsJbXV0ZXhfaW5p dCgmdi0+bXV0ZXgpOwo+ICAgCWF0b21pY19zZXQoJnYtPm9wZW5lZCwgMCk7Cj4gICAJdi0+bWlu b3IgPSBtaW5vcjsKPiAgIAl2LT52ZHBhID0gdmRwYTsKCl9fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fClZpcnR1YWxpemF0aW9uIG1haWxpbmcgbGlzdApWaXJ0 dWFsaXphdGlvbkBsaXN0cy5saW51eC1mb3VuZGF0aW9uLm9yZwpodHRwczovL2xpc3RzLmxpbnV4 Zm91bmRhdGlvbi5vcmcvbWFpbG1hbi9saXN0aW5mby92aXJ0dWFsaXphdGlvbg==