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b=D4ciXllZTzPnBGkFgGjFjwcXYA/hqZeZV0KHVL2yV2tCHBRUtpxq6wizONCCp9mfWSNQ2y j6hBf3qUxB95tv6xsl/wmWaMlrwpw20dFobFGOg2hIxAmU5AZohs8rYjRoOjILRcCRnLNx Hl+9VPTrC/5a3ZxCfLyWoGwlCjkZm8w= 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-428-Bm8Un-RYP9C2dwbPJU6f5g-1; Mon, 22 Mar 2021 23:02:29 -0400 X-MC-Unique: Bm8Un-RYP9C2dwbPJU6f5g-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 6B014881276; Tue, 23 Mar 2021 03:02:27 +0000 (UTC) Received: from wangxiaodeMacBook-Air.local (ovpn-12-238.pek2.redhat.com [10.72.12.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id 187771F05A; Tue, 23 Mar 2021 03:02:10 +0000 (UTC) Subject: Re: [PATCH v5 03/11] 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, mika.penttila@nextfour.com, dan.carpenter@oracle.com References: <20210315053721.189-1-xieyongji@bytedance.com> <20210315053721.189-4-xieyongji@bytedance.com> From: Jason Wang Message-ID: <38a2ae38-ebf7-3e3b-3439-d95a6f49b48b@redhat.com> Date: Tue, 23 Mar 2021 11:02:09 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210315053721.189-4-xieyongji@bytedance.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Cc: linux-fsdevel@vger.kernel.org, netdev@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="gbk"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" CtTaIDIwMjEvMy8xNSDPws7nMTozNywgWGllIFlvbmdqaSDQtLXAOgo+IFVzZSB2aG9zdF9kZXYt Pm11dGV4IHRvIHByb3RlY3Qgdmhvc3QgZGV2aWNlIGlvdGxiIGZyb20KPiBjb25jdXJyZW50IGFj Y2Vzcy4KPgo+IEZpeGVzOiA0YzhjZjMxOCgidmhvc3Q6IGludHJvZHVjZSB2RFBBLWJhc2VkIGJh Y2tlbmQiKQo+IFNpZ25lZC1vZmYtYnk6IFhpZSBZb25namkgPHhpZXlvbmdqaUBieXRlZGFuY2Uu Y29tPgoKCkFja2VkLWJ5OiBKYXNvbiBXYW5nIDxqYXNvd2FuZ0ByZWRoYXQuY29tPgoKUGxlYXNl IGNjIHN0YWJsZSBmb3IgbmV4dCB2ZXJzaW9uLgoKVGhhbmtzCgoKPiAtLS0KPiAgIGRyaXZlcnMv dmhvc3QvdmRwYS5jIHwgNiArKysrKy0KPiAgIDEgZmlsZSBjaGFuZ2VkLCA1IGluc2VydGlvbnMo KyksIDEgZGVsZXRpb24oLSkKPgo+IGRpZmYgLS1naXQgYS9kcml2ZXJzL3Zob3N0L3ZkcGEuYyBi L2RyaXZlcnMvdmhvc3QvdmRwYS5jCj4gaW5kZXggY2IxNGM2NmViMmVjLi4zZjcxNzVjMmFjMjQg MTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy92aG9zdC92ZHBhLmMKPiArKysgYi9kcml2ZXJzL3Zob3N0 L3ZkcGEuYwo+IEBAIC03MTksOSArNzE5LDExIEBAIHN0YXRpYyBpbnQgdmhvc3RfdmRwYV9wcm9j ZXNzX2lvdGxiX21zZyhzdHJ1Y3Qgdmhvc3RfZGV2ICpkZXYsCj4gICAJY29uc3Qgc3RydWN0IHZk cGFfY29uZmlnX29wcyAqb3BzID0gdmRwYS0+Y29uZmlnOwo+ICAgCWludCByID0gMDsKPiAgIAo+ ICsJbXV0ZXhfbG9jaygmZGV2LT5tdXRleCk7Cj4gKwo+ICAgCXIgPSB2aG9zdF9kZXZfY2hlY2tf b3duZXIoZGV2KTsKPiAgIAlpZiAocikKPiAtCQlyZXR1cm4gcjsKPiArCQlnb3RvIHVubG9jazsK PiAgIAo+ICAgCXN3aXRjaCAobXNnLT50eXBlKSB7Cj4gICAJY2FzZSBWSE9TVF9JT1RMQl9VUERB VEU6Cj4gQEAgLTc0Miw2ICs3NDQsOCBAQCBzdGF0aWMgaW50IHZob3N0X3ZkcGFfcHJvY2Vzc19p b3RsYl9tc2coc3RydWN0IHZob3N0X2RldiAqZGV2LAo+ICAgCQlyID0gLUVJTlZBTDsKPiAgIAkJ YnJlYWs7Cj4gICAJfQo+ICt1bmxvY2s6Cj4gKwltdXRleF91bmxvY2soJmRldi0+bXV0ZXgpOwo+ ICAgCj4gICAJcmV0dXJuIHI7Cj4gICB9CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpWaXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRp b25AbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRp b24ub3JnL21haWxtYW4vbGlzdGluZm8vdmlydHVhbGl6YXRpb24=