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=-4.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable 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 B7FBAC004C9 for ; Wed, 1 May 2019 15:22:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 873B9208C3 for ; Wed, 1 May 2019 15:22:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="BsP6AnL/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726909AbfEAPWO (ORCPT ); Wed, 1 May 2019 11:22:14 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:43614 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726797AbfEAPWN (ORCPT ); Wed, 1 May 2019 11:22:13 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x41ExFjM181642; Wed, 1 May 2019 15:21:05 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=i/eVb1RrPCrDgsQYwTIls1vT7PGrIbuHhUptmv1sc2U=; b=BsP6AnL/ORY8ld331R4h0ac65YxS73XkP57Vczvh6L/OUPqAHMOzeF1ujrkUCRrgatxc jebYYcNYN8gNQ1pZZRlBgRtNrMTisjdd42nTg+Ycd9UXFg6tu7mpm/FPlvNziKb4GHgk Ev/rAHicr5ObHUMRbubGeDPRgTwGg3FWy0K33/iF0u2XsYkT68SDeK3uZU5y4oVZ33kj +ktkW9kzO8wVZMrVdA8Y+QMoCoV8U1+8O4GynSn3BODBw+OLs3zxFhsPGV8DCVHOV/rL f8jPd2DGbY/dStdvsDL4ViC8D5ksbEkNxvDpzU9xr8j+5etNJkZgs8hgSt7qW6slgjfr KA== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 2s6xhyk8g7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 01 May 2019 15:21:04 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x41FIh2M030628; Wed, 1 May 2019 15:19:04 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 2s6xhgjet8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 01 May 2019 15:19:03 +0000 Received: from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x41FIjxB018467; Wed, 1 May 2019 15:18:46 GMT Received: from [192.168.1.16] (/24.9.64.241) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 01 May 2019 08:18:45 -0700 Subject: Re: [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO) To: Waiman Long , Ingo Molnar Cc: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de, keescook@google.com, konrad.wilk@oracle.com, Juerg Haefliger , deepa.srinivasan@oracle.com, chris.hyser@oracle.com, tyhicks@canonical.com, dwmw@amazon.co.uk, andrew.cooper3@citrix.com, jcm@redhat.com, boris.ostrovsky@oracle.com, iommu@lists.linux-foundation.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, Khalid Aziz , Linus Torvalds , Andrew Morton , Thomas Gleixner , Andy Lutomirski , Peter Zijlstra , Dave Hansen , Borislav Petkov , "H. Peter Anvin" , Arjan van de Ven , Greg Kroah-Hartman References: <20190417161042.GA43453@gmail.com> <35c4635e-8214-7dde-b4ec-4cb266b2ea10@redhat.com> From: Khalid Aziz Organization: Oracle Corp Message-ID: <4a47cf86-a05d-3de5-0320-eda06101cc75@oracle.com> Date: Wed, 1 May 2019 09:18:41 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <35c4635e-8214-7dde-b4ec-4cb266b2ea10@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9243 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-1905010096 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9243 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=1011 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-1905010096 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/1/19 8:49 AM, Waiman Long wrote: > On Wed, Apr 03, 2019 at 11:34:04AM -0600, Khalid Aziz wrote: >> diff --git a/Documentation/admin-guide/kernel-parameters.txt > b/Documentation/admin-guide/kernel-parameters.txt >=20 >> index 858b6c0b9a15..9b36da94760e 100644 >> --- a/Documentation/admin-guide/kernel-parameters.txt >> +++ b/Documentation/admin-guide/kernel-parameters.txt >> @@ -2997,6 +2997,12 @@ >> >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 nox2apic=C2=A0=C2=A0=C2=A0 [X86-64,APIC= ] Do not enable x2APIC mode. >> >> +=C2=A0=C2=A0=C2=A0 noxpfo=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [= XPFO] Disable eXclusive Page Frame Ownership (XPFO) >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 wh= en CONFIG_XPFO is on. Physical pages mapped into >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 us= er applications will also be mapped in the >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ke= rnel's address space as if CONFIG_XPFO was not >> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 en= abled. >> + >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cpu0_hotplug=C2=A0=C2=A0=C2=A0 [X86] Tu= rn on CPU0 hotplug feature when >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 CONFIG_BO OTPARAM_HOTPLUG_CPU0 is off. >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 Some features depend on CPU0. Known dependencies are: >=20 > Given the big performance impact that XPFO can have. It should be off b= y > default when configured. Instead, the xpfo option should be used to > enable it. Agreed. I plan to disable it by default in the next version of the patch. This is likely to end up being a feature for extreme security conscious folks only, unless I or someone else comes up with further significant performance boost. Thanks, Khalid From mboxrd@z Thu Jan 1 00:00:00 1970 From: Khalid Aziz Subject: Re: [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO) Date: Wed, 1 May 2019 09:18:41 -0600 Message-ID: <4a47cf86-a05d-3de5-0320-eda06101cc75@oracle.com> References: <20190417161042.GA43453@gmail.com> <35c4635e-8214-7dde-b4ec-4cb266b2ea10@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <35c4635e-8214-7dde-b4ec-4cb266b2ea10@redhat.com> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Waiman Long , Ingo Molnar Cc: Dave Hansen , linux-doc@vger.kernel.org, linux-mm@kvack.org, deepa.srinivasan@oracle.com, "H. Peter Anvin" , Thomas Gleixner , tycho@tycho.ws, x86@kernel.org, iommu@lists.linux-foundation.org, jsteckli@amazon.de, Arjan van de Ven , Peter Zijlstra , konrad.wilk@oracle.com, jcm@redhat.com, Greg Kroah-Hartman , Borislav Petkov , Andy Lutomirski , boris.ostrovsky@oracle.com, chris.hyser@oracle.com, linux-arm-kernel@lists.infradead.org, Khalid Aziz , juergh@gmail.com, andrew.cooper3@citrix.com, linux-kernel@vger.kernel.org, tyhicks@canonical.com, linux-security-module@vger.kernel.org, Juerg Haefliger , keescook@google.com, Andrew Morton , Linus List-Id: iommu@lists.linux-foundation.org T24gNS8xLzE5IDg6NDkgQU0sIFdhaW1hbiBMb25nIHdyb3RlOgo+IE9uIFdlZCwgQXByIDAzLCAy MDE5IGF0IDExOjM0OjA0QU0gLTA2MDAsIEtoYWxpZCBBeml6IHdyb3RlOgo+PiBkaWZmIC0tZ2l0 IGEvRG9jdW1lbnRhdGlvbi9hZG1pbi1ndWlkZS9rZXJuZWwtcGFyYW1ldGVycy50eHQKPiBiL0Rv Y3VtZW50YXRpb24vYWRtaW4tZ3VpZGUva2VybmVsLXBhcmFtZXRlcnMudHh0Cj4gCj4+IGluZGV4 IDg1OGI2YzBiOWExNS4uOWIzNmRhOTQ3NjBlIDEwMDY0NAo+PiAtLS0gYS9Eb2N1bWVudGF0aW9u L2FkbWluLWd1aWRlL2tlcm5lbC1wYXJhbWV0ZXJzLnR4dAo+PiArKysgYi9Eb2N1bWVudGF0aW9u L2FkbWluLWd1aWRlL2tlcm5lbC1wYXJhbWV0ZXJzLnR4dAo+PiBAQCAtMjk5Nyw2ICsyOTk3LDEy IEBACj4+Cj4+IMKgwqDCoMKgwqAgbm94MmFwaWPCoMKgwqAgW1g4Ni02NCxBUElDXSBEbyBub3Qg ZW5hYmxlIHgyQVBJQyBtb2RlLgo+Pgo+PiArwqDCoMKgIG5veHBmb8KgwqDCoMKgwqDCoMKgIFtY UEZPXSBEaXNhYmxlIGVYY2x1c2l2ZSBQYWdlIEZyYW1lIE93bmVyc2hpcCAoWFBGTykKPj4gK8Kg wqDCoMKgwqDCoMKgwqDCoMKgwqAgd2hlbiBDT05GSUdfWFBGTyBpcyBvbi4gUGh5c2ljYWwgcGFn ZXMgbWFwcGVkIGludG8KPj4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqAgdXNlciBhcHBsaWNhdGlv bnMgd2lsbCBhbHNvIGJlIG1hcHBlZCBpbiB0aGUKPj4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqAg a2VybmVsJ3MgYWRkcmVzcyBzcGFjZSBhcyBpZiBDT05GSUdfWFBGTyB3YXMgbm90Cj4+ICvCoMKg wqDCoMKgwqDCoMKgwqDCoMKgIGVuYWJsZWQuCj4+ICsKPj4gwqDCoMKgwqDCoCBjcHUwX2hvdHBs dWfCoMKgwqAgW1g4Nl0gVHVybiBvbiBDUFUwIGhvdHBsdWcgZmVhdHVyZSB3aGVuCj4+IMKgwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgIENPTkZJR19CTyBPVFBBUkFNX0hPVFBMVUdfQ1BVMCBpcyBv ZmYuCj4+IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIFNvbWUgZmVhdHVyZXMgZGVwZW5kIG9u IENQVTAuIEtub3duIGRlcGVuZGVuY2llcyBhcmU6Cj4gCj4gR2l2ZW4gdGhlIGJpZyBwZXJmb3Jt YW5jZSBpbXBhY3QgdGhhdCBYUEZPIGNhbiBoYXZlLiBJdCBzaG91bGQgYmUgb2ZmIGJ5Cj4gZGVm YXVsdCB3aGVuIGNvbmZpZ3VyZWQuIEluc3RlYWQsIHRoZSB4cGZvIG9wdGlvbiBzaG91bGQgYmUg dXNlZCB0bwo+IGVuYWJsZSBpdC4KCkFncmVlZC4gSSBwbGFuIHRvIGRpc2FibGUgaXQgYnkgZGVm YXVsdCBpbiB0aGUgbmV4dCB2ZXJzaW9uIG9mIHRoZQpwYXRjaC4gVGhpcyBpcyBsaWtlbHkgdG8g ZW5kIHVwIGJlaW5nIGEgZmVhdHVyZSBmb3IgZXh0cmVtZSBzZWN1cml0eQpjb25zY2lvdXMgZm9s a3Mgb25seSwgdW5sZXNzIEkgb3Igc29tZW9uZSBlbHNlIGNvbWVzIHVwIHdpdGggZnVydGhlcgpz aWduaWZpY2FudCBwZXJmb3JtYW5jZSBib29zdC4KClRoYW5rcywKS2hhbGlkCgoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBt YWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9s aXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo= 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=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 78367C43219 for ; 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Peter Anvin" , Thomas Gleixner , tycho@tycho.ws, x86@kernel.org, iommu@lists.linux-foundation.org, jsteckli@amazon.de, Arjan van de Ven , Peter Zijlstra , konrad.wilk@oracle.com, jcm@redhat.com, Greg Kroah-Hartman , Borislav Petkov , Andy Lutomirski , boris.ostrovsky@oracle.com, chris.hyser@oracle.com, linux-arm-kernel@lists.infradead.org, Khalid Aziz , juergh@gmail.com, andrew.cooper3@citrix.com, linux-kernel@vger.kernel.org, tyhicks@canonical.com, linux-security-module@vger.kernel.org, Juerg Haefliger , keescook@google.com, Andrew Morton , Linus Torvalds , dwmw@amazon.co.uk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gNS8xLzE5IDg6NDkgQU0sIFdhaW1hbiBMb25nIHdyb3RlOgo+IE9uIFdlZCwgQXByIDAzLCAy MDE5IGF0IDExOjM0OjA0QU0gLTA2MDAsIEtoYWxpZCBBeml6IHdyb3RlOgo+PiBkaWZmIC0tZ2l0 IGEvRG9jdW1lbnRhdGlvbi9hZG1pbi1ndWlkZS9rZXJuZWwtcGFyYW1ldGVycy50eHQKPiBiL0Rv Y3VtZW50YXRpb24vYWRtaW4tZ3VpZGUva2VybmVsLXBhcmFtZXRlcnMudHh0Cj4gCj4+IGluZGV4 IDg1OGI2YzBiOWExNS4uOWIzNmRhOTQ3NjBlIDEwMDY0NAo+PiAtLS0gYS9Eb2N1bWVudGF0aW9u L2FkbWluLWd1aWRlL2tlcm5lbC1wYXJhbWV0ZXJzLnR4dAo+PiArKysgYi9Eb2N1bWVudGF0aW9u L2FkbWluLWd1aWRlL2tlcm5lbC1wYXJhbWV0ZXJzLnR4dAo+PiBAQCAtMjk5Nyw2ICsyOTk3LDEy IEBACj4+Cj4+IMKgwqDCoMKgwqAgbm94MmFwaWPCoMKgwqAgW1g4Ni02NCxBUElDXSBEbyBub3Qg ZW5hYmxlIHgyQVBJQyBtb2RlLgo+Pgo+PiArwqDCoMKgIG5veHBmb8KgwqDCoMKgwqDCoMKgIFtY UEZPXSBEaXNhYmxlIGVYY2x1c2l2ZSBQYWdlIEZyYW1lIE93bmVyc2hpcCAoWFBGTykKPj4gK8Kg wqDCoMKgwqDCoMKgwqDCoMKgwqAgd2hlbiBDT05GSUdfWFBGTyBpcyBvbi4gUGh5c2ljYWwgcGFn ZXMgbWFwcGVkIGludG8KPj4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqAgdXNlciBhcHBsaWNhdGlv bnMgd2lsbCBhbHNvIGJlIG1hcHBlZCBpbiB0aGUKPj4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqAg a2VybmVsJ3MgYWRkcmVzcyBzcGFjZSBhcyBpZiBDT05GSUdfWFBGTyB3YXMgbm90Cj4+ICvCoMKg wqDCoMKgwqDCoMKgwqDCoMKgIGVuYWJsZWQuCj4+ICsKPj4gwqDCoMKgwqDCoCBjcHUwX2hvdHBs dWfCoMKgwqAgW1g4Nl0gVHVybiBvbiBDUFUwIGhvdHBsdWcgZmVhdHVyZSB3aGVuCj4+IMKgwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgIENPTkZJR19CTyBPVFBBUkFNX0hPVFBMVUdfQ1BVMCBpcyBv ZmYuCj4+IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIFNvbWUgZmVhdHVyZXMgZGVwZW5kIG9u IENQVTAuIEtub3duIGRlcGVuZGVuY2llcyBhcmU6Cj4gCj4gR2l2ZW4gdGhlIGJpZyBwZXJmb3Jt YW5jZSBpbXBhY3QgdGhhdCBYUEZPIGNhbiBoYXZlLiBJdCBzaG91bGQgYmUgb2ZmIGJ5Cj4gZGVm YXVsdCB3aGVuIGNvbmZpZ3VyZWQuIEluc3RlYWQsIHRoZSB4cGZvIG9wdGlvbiBzaG91bGQgYmUg dXNlZCB0bwo+IGVuYWJsZSBpdC4KCkFncmVlZC4gSSBwbGFuIHRvIGRpc2FibGUgaXQgYnkgZGVm YXVsdCBpbiB0aGUgbmV4dCB2ZXJzaW9uIG9mIHRoZQpwYXRjaC4gVGhpcyBpcyBsaWtlbHkgdG8g ZW5kIHVwIGJlaW5nIGEgZmVhdHVyZSBmb3IgZXh0cmVtZSBzZWN1cml0eQpjb25zY2lvdXMgZm9s a3Mgb25seSwgdW5sZXNzIEkgb3Igc29tZW9uZSBlbHNlIGNvbWVzIHVwIHdpdGggZnVydGhlcgpz aWduaWZpY2FudCBwZXJmb3JtYW5jZSBib29zdC4KClRoYW5rcywKS2hhbGlkCgoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBt YWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9s aXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=