From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Ostrovsky Subject: Re: Question regarding swiotlb-xen in Linux kernel Date: Thu, 18 Apr 2019 17:09:13 -0400 Message-ID: <26fd14a9-2e60-73ff-ce56-6f12369ac13c@oracle.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hHEHa-0001st-Cb for xen-devel@lists.xenproject.org; Thu, 18 Apr 2019 21:09:22 +0000 In-Reply-To: Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Juergen Gross , Konrad Rzeszutek Wilk Cc: xen-devel , Joe Jin List-Id: xen-devel@lists.xenproject.org T24gNC8xOC8xOSAzOjM2IEFNLCBKdWVyZ2VuIEdyb3NzIHdyb3RlOgo+IEknbSBjdXJyZW50bHkg aW52ZXN0aWdhdGluZyBhIHByb2JsZW0gcmVsYXRlZCB0byBzd2lvdGxiLXhlbi4gV2l0aCBhCj4g c3BlY2lmaWMgZHJpdmVyIGEgY3VzdG9tZXIgaXMgY2FwYWJsZSB0byB0cmlnZ2VyIGEgc2l0dWF0 aW9uIHdoZXJlIGEKPiBNRk4gaXMgbWFwcGVkIHRvIG11bHRpcGxlIGRvbTAgUEZOcyBhdCB0aGUg c2FtZSB0aW1lLiBUaGVyZSBpcyBubwo+IGd1ZXN0IGludm9sdmVkLCBzbyB0aGlzIGlzIG5vdCBy ZWxhdGVkIHRvIGdyYW50cy4KPgo+IFdpdCBhIGRlYnVnIGtlcm5lbCBJIGhhdmUgbWFuYWdlZCB0 byB0cmFjayB0aGUgaW5jb25zaXN0ZW5jeSB0byBhCj4gY2FsbCBvZiB4ZW5fZGVzdHJveV9jb250 aWd1b3VzX3JlZ2lvbigpIGZyb20geGVuX3N3aW90bGJfZnJlZV9jb2hlcmVudCgpCj4gd2hlcmUg dGhlIHJlZ2lvbiB3YXMgb2J2aW91c2x5IG5vdCBjb250aWd1b3VzLgo+Cj4geGVuX3N3aW90bGJf ZnJlZV9jb2hlcmVudCgpIGNvbnRhaW5zOgo+Cj4gICAgICAgICBpZiAoKChkZXZfYWRkciArIHNp emUgLSAxIDw9IGRtYV9tYXNrKSkgfHwKPiAgICAgICAgICAgICByYW5nZV9zdHJhZGRsZXNfcGFn ZV9ib3VuZGFyeShwaHlzLCBzaXplKSkKPiAgICAgICAgICAgICAgICAgeGVuX2Rlc3Ryb3lfY29u dGlndW91c19yZWdpb24ocGh5cywgb3JkZXIpOwo+Cj4gU2hvdWxkbid0IGl0IGJlIGVpdGhlcjoK Pgo+ICAgICAgICAgaWYgKCgoZGV2X2FkZHIgKyBzaXplIC0gMSA8PSBkbWFfbWFzaykpICYmCj4g ICAgICAgICAgICAgIXJhbmdlX3N0cmFkZGxlc19wYWdlX2JvdW5kYXJ5KHBoeXMsIHNpemUpKQo+ ICAgICAgICAgICAgICAgICB4ZW5fZGVzdHJveV9jb250aWd1b3VzX3JlZ2lvbihwaHlzLCBvcmRl cik7CgorSm9lCgpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL2FyY2hpdmVzL2h0bWwveGVu LWRldmVsLzIwMTgtMTAvbXNnMDE5MjAuaHRtbAoKKFRoZSBkaXNjdXNzaW9uIGhhcHBlbmVkIGlu Cmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvYXJjaGl2ZXMvaHRtbC94ZW4tZGV2ZWwvMjAx OC0xMC9tc2cwMTgxNC5odG1sKQoKQW5kIGxvb2tzIGxpa2Ugd2UgZHJvcHBlZCBpdC4gT3Igd2Fz IHRoZXJlIGEgcmVhc29uIHdlIGhhdmVuJ3QgcGlja2VkIGl0IHVwPwoKCi1ib3JpcwoKCj4KPgo+ IG9yOgo+Cj4gICAgICAgICBpZiAoZGV2X2FkZHIgKyBzaXplIC0gMSA8PSBkbWFfbWFzaykgewo+ ICAgICAgICAgICAgIEJVR19PTihyYW5nZV9zdHJhZGRsZXNfcGFnZV9ib3VuZGFyeShwaHlzLCBz aXplKSk7Cj4gICAgICAgICAgICAgeGVuX2Rlc3Ryb3lfY29udGlndW91c19yZWdpb24ocGh5cywg b3JkZXIpOwo+ICAgICAgICAgfQo+Cj4gYXMgY2FsbGluZyB4ZW5fZGVzdHJveV9jb250aWd1b3Vz X3JlZ2lvbigpIHdpdGggYSBub24tY29udGlndW91cyBtZW1vcnkKPiByZWdpb24gaXMgYSBwZXJm ZWN0IHJlY2VpcHQgZm9yIGEgbGF0ZW50IGNyYXNoPwo+Cj4gVGhlIHJlbWFpbmluZyBxdWVzdGlv biBpcyB3aHkgdGhlIGRyaXZlciBpcyBjYWxsaW5nCj4geGVuX3N3aW90bGJfZnJlZV9jb2hlcmVu dCgpIGZvciBhIG5vbi1jb250aWd1b3VzIHJlZ2lvbiwgb2YgY291cnNlLgo+Cj4KPiBKdWVyZ2Vu CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRl dmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9s aXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA== 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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED 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 9FE6AC10F0E for ; 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Thu, 18 Apr 2019 21:09:20 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x3IL8V57110257; Thu, 18 Apr 2019 21:09:19 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 2rubq7rtw4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 18 Apr 2019 21:09:19 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x3IL9HG8002803; Thu, 18 Apr 2019 21:09:17 GMT Received: from dhcp-burlington7-2nd-B-east-10-152-55-162.usdhcp.oraclecorp.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 18 Apr 2019 14:09:17 -0700 To: Juergen Gross , Konrad Rzeszutek Wilk References: From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; prefer-encrypt=mutual; keydata= mQINBFH8CgsBEAC0KiOi9siOvlXatK2xX99e/J3OvApoYWjieVQ9232Eb7GzCWrItCzP8FUV PQg8rMsSd0OzIvvjbEAvaWLlbs8wa3MtVLysHY/DfqRK9Zvr/RgrsYC6ukOB7igy2PGqZd+M MDnSmVzik0sPvB6xPV7QyFsykEgpnHbvdZAUy/vyys8xgT0PVYR5hyvhyf6VIfGuvqIsvJw5 C8+P71CHI+U/IhsKrLrsiYHpAhQkw+Zvyeml6XSi5w4LXDbF+3oholKYCkPwxmGdK8MUIdkM d7iYdKqiP4W6FKQou/lC3jvOceGupEoDV9botSWEIIlKdtm6C4GfL45RD8V4B9iy24JHPlom woVWc0xBZboQguhauQqrBFooHO3roEeM1pxXjLUbDtH4t3SAI3gt4dpSyT3EvzhyNQVVIxj2 FXnIChrYxR6S0ijSqUKO0cAduenhBrpYbz9qFcB/GyxD+ZWY7OgQKHUZMWapx5bHGQ8bUZz2 SfjZwK+GETGhfkvNMf6zXbZkDq4kKB/ywaKvVPodS1Poa44+B9sxbUp1jMfFtlOJ3AYB0WDS Op3d7F2ry20CIf1Ifh0nIxkQPkTX7aX5rI92oZeu5u038dHUu/dO2EcuCjl1eDMGm5PLHDSP 0QUw5xzk1Y8MG1JQ56PtqReO33inBXG63yTIikJmUXFTw6lLJwARAQABtDNCb3JpcyBPc3Ry b3Zza3kgKFdvcmspIDxib3Jpcy5vc3Ryb3Zza3lAb3JhY2xlLmNvbT6JAjgEEwECACIFAlH8 CgsCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEIredpCGysGyasEP/j5xApopUf4g 9Fl3UxZuBx+oduuw3JHqgbGZ2siA3EA4bKwtKq8eT7ekpApn4c0HA8TWTDtgZtLSV5IdH+9z JimBDrhLkDI3Zsx2CafL4pMJvpUavhc5mEU8myp4dWCuIylHiWG65agvUeFZYK4P33fGqoaS VGx3tsQIAr7MsQxilMfRiTEoYH0WWthhE0YVQzV6kx4wj4yLGYPPBtFqnrapKKC8yFTpgjaK jImqWhU9CSUAXdNEs/oKVR1XlkDpMCFDl88vKAuJwugnixjbPFTVPyoC7+4Bm/FnL3iwlJVE qIGQRspt09r+datFzPqSbp5Fo/9m4JSvgtPp2X2+gIGgLPWp2ft1NXHHVWP19sPgEsEJXSr9 tskM8ScxEkqAUuDs6+x/ISX8wa5Pvmo65drN+JWA8EqKOHQG6LUsUdJolFM2i4Z0k40BnFU/ kjTARjrXW94LwokVy4x+ZYgImrnKWeKac6fMfMwH2aKpCQLlVxdO4qvJkv92SzZz4538az1T m+3ekJAimou89cXwXHCFb5WqJcyjDfdQF857vTn1z4qu7udYCuuV/4xDEhslUq1+GcNDjAhB nNYPzD+SvhWEsrjuXv+fDONdJtmLUpKs4Jtak3smGGhZsqpcNv8nQzUGDQZjuCSmDqW8vn2o hWwveNeRTkxh+2x1Qb3GT46uuQINBFH8CgsBEADGC/yx5ctcLQlB9hbq7KNqCDyZNoYu1HAB Hal3MuxPfoGKObEktawQPQaSTB5vNlDxKihezLnlT/PKjcXC2R1OjSDinlu5XNGc6mnky03q yymUPyiMtWhBBftezTRxWRslPaFWlg/h/Y1iDuOcklhpr7K1h1jRPCrf1yIoxbIpDbffnuyz kuto4AahRvBU4Js4sU7f/btU+h+e0AcLVzIhTVPIz7PM+Gk2LNzZ3/on4dnEc/qd+ZZFlOQ4 KDN/hPqlwA/YJsKzAPX51L6Vv344pqTm6Z0f9M7YALB/11FO2nBB7zw7HAUYqJeHutCwxm7i BDNt0g9fhviNcJzagqJ1R7aPjtjBoYvKkbwNu5sWDpQ4idnsnck4YT6ctzN4I+6lfkU8zMzC gM2R4qqUXmxFIS4Bee+gnJi0Pc3KcBYBZsDK44FtM//5Cp9DrxRQOh19kNHBlxkmEb8kL/pw XIDcEq8MXzPBbxwHKJ3QRWRe5jPNpf8HCjnZz0XyJV0/4M1JvOua7IZftOttQ6KnM4m6WNIZ 2ydg7dBhDa6iv1oKdL7wdp/rCulVWn8R7+3cRK95SnWiJ0qKDlMbIN8oGMhHdin8cSRYdmHK kTnvSGJNlkis5a+048o0C6jI3LozQYD/W9wq7MvgChgVQw1iEOB4u/3FXDEGulRVko6xCBU4 SQARAQABiQIfBBgBAgAJBQJR/AoLAhsMAAoJEIredpCGysGyfvMQAIywR6jTqix6/fL0Ip8G jpt3uk//QNxGJE3ZkUNLX6N786vnEJvc1beCu6EwqD1ezG9fJKMl7F3SEgpYaiKEcHfoKGdh 30B3Hsq44vOoxR6zxw2B/giADjhmWTP5tWQ9548N4VhIZMYQMQCkdqaueSL+8asp8tBNP+TJ PAIIANYvJaD8xA7sYUXGTzOXDh2THWSvmEWWmzok8er/u6ZKdS1YmZkUy8cfzrll/9hiGCTj u3qcaOM6i/m4hqtvsI1cOORMVwjJF4+IkC5ZBoeRs/xW5zIBdSUoC8L+OCyj5JETWTt40+lu qoqAF/AEGsNZTrwHJYu9rbHH260C0KYCNqmxDdcROUqIzJdzDKOrDmebkEVnxVeLJBIhYZUd t3Iq9hdjpU50TA6sQ3mZxzBdfRgg+vaj2DsJqI5Xla9QGKD+xNT6v14cZuIMZzO7w0DoojM4 ByrabFsOQxGvE0w9Dch2BDSI2Xyk1zjPKxG1VNBQVx3flH37QDWpL2zlJikW29Ws86PHdthh Fm5PY8YtX576DchSP6qJC57/eAAe/9ztZdVAdesQwGb9hZHJc75B+VNm4xrh/PJO6c1THqdQ 19WVJ+7rDx3PhVncGlbAOiiiE3NOFPJ1OQYxPKtpBUukAlOTnkKE6QcA4zckFepUkfmBV1wM Jg6OxFYd01z+a+oL Message-ID: <26fd14a9-2e60-73ff-ce56-6f12369ac13c@oracle.com> Date: Thu, 18 Apr 2019 17:09:13 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9231 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904180125 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9231 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904180125 Subject: Re: [Xen-devel] Question regarding swiotlb-xen in Linux kernel X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-devel , Joe Jin Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Message-ID: <20190418210913.1FgdleTrYiE5Y0QAlVbsxfxZ4bLv5AcZ8SQHwor8BZk@z> T24gNC8xOC8xOSAzOjM2IEFNLCBKdWVyZ2VuIEdyb3NzIHdyb3RlOgo+IEknbSBjdXJyZW50bHkg aW52ZXN0aWdhdGluZyBhIHByb2JsZW0gcmVsYXRlZCB0byBzd2lvdGxiLXhlbi4gV2l0aCBhCj4g c3BlY2lmaWMgZHJpdmVyIGEgY3VzdG9tZXIgaXMgY2FwYWJsZSB0byB0cmlnZ2VyIGEgc2l0dWF0 aW9uIHdoZXJlIGEKPiBNRk4gaXMgbWFwcGVkIHRvIG11bHRpcGxlIGRvbTAgUEZOcyBhdCB0aGUg c2FtZSB0aW1lLiBUaGVyZSBpcyBubwo+IGd1ZXN0IGludm9sdmVkLCBzbyB0aGlzIGlzIG5vdCBy ZWxhdGVkIHRvIGdyYW50cy4KPgo+IFdpdCBhIGRlYnVnIGtlcm5lbCBJIGhhdmUgbWFuYWdlZCB0 byB0cmFjayB0aGUgaW5jb25zaXN0ZW5jeSB0byBhCj4gY2FsbCBvZiB4ZW5fZGVzdHJveV9jb250 aWd1b3VzX3JlZ2lvbigpIGZyb20geGVuX3N3aW90bGJfZnJlZV9jb2hlcmVudCgpCj4gd2hlcmUg dGhlIHJlZ2lvbiB3YXMgb2J2aW91c2x5IG5vdCBjb250aWd1b3VzLgo+Cj4geGVuX3N3aW90bGJf ZnJlZV9jb2hlcmVudCgpIGNvbnRhaW5zOgo+Cj4gICAgICAgICBpZiAoKChkZXZfYWRkciArIHNp emUgLSAxIDw9IGRtYV9tYXNrKSkgfHwKPiAgICAgICAgICAgICByYW5nZV9zdHJhZGRsZXNfcGFn ZV9ib3VuZGFyeShwaHlzLCBzaXplKSkKPiAgICAgICAgICAgICAgICAgeGVuX2Rlc3Ryb3lfY29u dGlndW91c19yZWdpb24ocGh5cywgb3JkZXIpOwo+Cj4gU2hvdWxkbid0IGl0IGJlIGVpdGhlcjoK Pgo+ICAgICAgICAgaWYgKCgoZGV2X2FkZHIgKyBzaXplIC0gMSA8PSBkbWFfbWFzaykpICYmCj4g ICAgICAgICAgICAgIXJhbmdlX3N0cmFkZGxlc19wYWdlX2JvdW5kYXJ5KHBoeXMsIHNpemUpKQo+ ICAgICAgICAgICAgICAgICB4ZW5fZGVzdHJveV9jb250aWd1b3VzX3JlZ2lvbihwaHlzLCBvcmRl cik7CgorSm9lCgpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL2FyY2hpdmVzL2h0bWwveGVu LWRldmVsLzIwMTgtMTAvbXNnMDE5MjAuaHRtbAoKKFRoZSBkaXNjdXNzaW9uIGhhcHBlbmVkIGlu Cmh0dHBzOi8vbGlzdHMueGVucHJvamVjdC5vcmcvYXJjaGl2ZXMvaHRtbC94ZW4tZGV2ZWwvMjAx OC0xMC9tc2cwMTgxNC5odG1sKQoKQW5kIGxvb2tzIGxpa2Ugd2UgZHJvcHBlZCBpdC4gT3Igd2Fz IHRoZXJlIGEgcmVhc29uIHdlIGhhdmVuJ3QgcGlja2VkIGl0IHVwPwoKCi1ib3JpcwoKCj4KPgo+ IG9yOgo+Cj4gICAgICAgICBpZiAoZGV2X2FkZHIgKyBzaXplIC0gMSA8PSBkbWFfbWFzaykgewo+ ICAgICAgICAgICAgIEJVR19PTihyYW5nZV9zdHJhZGRsZXNfcGFnZV9ib3VuZGFyeShwaHlzLCBz aXplKSk7Cj4gICAgICAgICAgICAgeGVuX2Rlc3Ryb3lfY29udGlndW91c19yZWdpb24ocGh5cywg b3JkZXIpOwo+ICAgICAgICAgfQo+Cj4gYXMgY2FsbGluZyB4ZW5fZGVzdHJveV9jb250aWd1b3Vz X3JlZ2lvbigpIHdpdGggYSBub24tY29udGlndW91cyBtZW1vcnkKPiByZWdpb24gaXMgYSBwZXJm ZWN0IHJlY2VpcHQgZm9yIGEgbGF0ZW50IGNyYXNoPwo+Cj4gVGhlIHJlbWFpbmluZyBxdWVzdGlv biBpcyB3aHkgdGhlIGRyaXZlciBpcyBjYWxsaW5nCj4geGVuX3N3aW90bGJfZnJlZV9jb2hlcmVu dCgpIGZvciBhIG5vbi1jb250aWd1b3VzIHJlZ2lvbiwgb2YgY291cnNlLgo+Cj4KPiBKdWVyZ2Vu CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRl dmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9s aXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA==