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bh=LK1gkUDCVU2wXhLmdo9y4e2VFlC9AyfBMYWVi3JTuH0=; b=TT23swG/ZLhdn2bQM4s5FcY9hj/Qjt55Ae6s5mZdaut8q2QG3gZjoldTGVerlJXcnYvtDK DPOWOVuaUzpiJNHOgsUJVNJd8HNWv+Fk6FjVx0IJ8i3cliJBCzQJPYu8bO0F47S/lKHTm/ MsF65oSC5J62Gf/PrcaKh15xboEDaa4= 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-287-qTtKdB2CO4-FOUQ3lhPbRQ-1; Sun, 06 Dec 2020 21:51:51 -0500 X-MC-Unique: qTtKdB2CO4-FOUQ3lhPbRQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 52ECC801B12; Mon, 7 Dec 2020 02:51:50 +0000 (UTC) Received: from [10.72.13.171] (ovpn-13-171.pek2.redhat.com [10.72.13.171]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8164E5D9DC; Mon, 7 Dec 2020 02:51:45 +0000 (UTC) Subject: Re: [PATCH] vdpa/mlx5: Use write memory barrier after updating CQ index To: Eli Cohen , mst@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <20201206105719.123753-1-elic@nvidia.com> From: Jason Wang Message-ID: Date: Mon, 7 Dec 2020 10:51:44 +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: <20201206105719.123753-1-elic@nvidia.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Cc: lulu@redhat.com 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" Ck9uIDIwMjAvMTIvNiDkuIvljYg2OjU3LCBFbGkgQ29oZW4gd3JvdGU6Cj4gTWFrZSBzdXJlIHRv IHB1dCB3cml0ZSBtZW1vcnkgYmFycmllciBhZnRlciB1cGRhdGluZyBDUSBjb25zdW1lciBpbmRl eAo+IHNvIHRoZSBoYXJkd2FyZSBrbm93cyB0aGF0IHRoZXJlIGFyZSBhdmFpbGFibGUgQ1FFIHNs b3RzIGluIHRoZSBxdWV1ZS4KPgo+IEZhaWx1cmUgdG8gZG8gdGhpcyBjYW4gY2F1c2UgdGhlIHVw ZGF0ZSBvZiB0aGUgUlggZG9vcmJlbGwgcmVjb3JkIHRvIGdldAo+IHVwZGF0ZWQgYmVmb3JlIHRo ZSBDUSBjb25zdW1lciBpbmRleCByZXN1bHRpbmcgaW4gQ1Egb3ZlcnJ1bi4KPgo+IENoYW5nZS1J ZDogSWIwYWU0YzExOGNjZTUyNGM5ZjQ5MmIzMjU2OTE3OWYzYzFmMDRjYzEKPiBGaXhlczogMWE4 NmIzNzdhYTIxICgidmRwYS9tbHg1OiBBZGQgVkRQQSBkcml2ZXIgZm9yIHN1cHBvcnRlZCBtbHg1 IGRldmljZXMiKQo+IFNpZ25lZC1vZmYtYnk6IEVsaSBDb2hlbiA8ZWxpY0BudmlkaWEuY29tPgo+ IC0tLQo+ICAgZHJpdmVycy92ZHBhL21seDUvbmV0L21seDVfdm5ldC5jIHwgNSArKysrKwo+ICAg MSBmaWxlIGNoYW5nZWQsIDUgaW5zZXJ0aW9ucygrKQo+Cj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMv dmRwYS9tbHg1L25ldC9tbHg1X3ZuZXQuYyBiL2RyaXZlcnMvdmRwYS9tbHg1L25ldC9tbHg1X3Zu ZXQuYwo+IGluZGV4IDFmNDA4OWM2ZjlkNy4uMjk1ZjQ2ZWVhMmE1IDEwMDY0NAo+IC0tLSBhL2Ry aXZlcnMvdmRwYS9tbHg1L25ldC9tbHg1X3ZuZXQuYwo+ICsrKyBiL2RyaXZlcnMvdmRwYS9tbHg1 L25ldC9tbHg1X3ZuZXQuYwo+IEBAIC00NzgsNiArNDc4LDExIEBAIHN0YXRpYyBpbnQgbWx4NV92 ZHBhX3BvbGxfb25lKHN0cnVjdCBtbHg1X3ZkcGFfY3EgKnZjcSkKPiAgIHN0YXRpYyB2b2lkIG1s eDVfdmRwYV9oYW5kbGVfY29tcGxldGlvbnMoc3RydWN0IG1seDVfdmRwYV92aXJ0cXVldWUgKm12 cSwgaW50IG51bSkKPiAgIHsKPiAgIAltbHg1X2NxX3NldF9jaSgmbXZxLT5jcS5tY3EpOwo+ICsK PiArCS8qIG1ha2Ugc3VyZSBDUSBjb3N1bWVyIHVwZGF0ZSBpcyB2aXNpYmxlIHRvIHRoZSBoYXJk d2FyZSBiZWZvcmUgdXBkYXRpbmcKPiArCSAqIFJYIGRvb3JiZWxsIHJlY29yZC4KPiArCSAqLwo+ ICsJd21iKCk7Cj4gICAJcnhfcG9zdCgmbXZxLT52cXFwLCBudW0pOwo+ICAgCWlmIChtdnEtPmV2 ZW50X2NiLmNhbGxiYWNrKQo+ICAgCQltdnEtPmV2ZW50X2NiLmNhbGxiYWNrKG12cS0+ZXZlbnRf Y2IucHJpdmF0ZSk7CgoKQWNrZWQtYnk6IEphc29uIFdhbmcgPGphc293YW5nQHJlZGhhdC5jb20+ CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KVmlydHVh bGl6YXRpb24gbWFpbGluZyBsaXN0ClZpcnR1YWxpemF0aW9uQGxpc3RzLmxpbnV4LWZvdW5kYXRp b24ub3JnCmh0dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZv L3ZpcnR1YWxpemF0aW9u