From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [PATCH 4/4] driver: provide sysfs interfaces to access SMX parameter Date: Fri, 10 May 2013 13:07:48 +0000 Message-ID: <1368191268.2425.38.camel@x230> References: <1367938519-840-1-git-send-email-qiaowei.ren@intel.com> <1367938519-840-5-git-send-email-qiaowei.ren@intel.com> <1367990697.2425.33.camel@x230> <9E0BE1322F2F2246BD820DA9FC397ADE9AC926@SHSMSX102.ccr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from tx2ehsobe003.messaging.microsoft.com ([65.55.88.13]:9157 "EHLO tx2outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751247Ab3EJNIw (ORCPT ); Fri, 10 May 2013 09:08:52 -0400 In-Reply-To: <9E0BE1322F2F2246BD820DA9FC397ADE9AC926@SHSMSX102.ccr.corp.intel.com> Content-Language: en-US Content-ID: Sender: platform-driver-x86-owner@vger.kernel.org List-ID: To: "Ren, Qiaowei" Cc: "linux-kernel@vger.kernel.org" , "platform-driver-x86@vger.kernel.org" , "Wei, Gang" T24gRnJpLCAyMDEzLTA1LTEwIGF0IDA3OjA1ICswMDAwLCBSZW4sIFFpYW93ZWkgd3JvdGU6DQo+ IE9uIDIwMTMtMDUtMDgsIE1hdHRoZXcgR2FycmV0dCB3cm90ZToNCj4gPiBPbiBUdWUsIDIwMTMt MDUtMDcgYXQgMjI6NTUgKzA4MDAsIFFpYW93ZWkgUmVuIHdyb3RlOg0KPiA+DQo+ID4gPiArV2hh dDoJCS9zeXMvZGV2aWNlcy9wbGF0Zm9ybS9pbnRlbF90eHQvcGFyYW1ldGVyL2FjbV9tYXhfc2l6 ZQ0KPiA+ID4gK0RhdGU6CQlNYXkgMjAxMw0KPiA+ID4gK0tlcm5lbFZlcnNpb246CTMuOQ0KPiA+ ID4gK0NvbnRhY3Q6CSJRaWFvd2VpIFJlbiIgPHFpYW93ZWkucmVuQGludGVsLmNvbT4NCj4gPiA+ ICtEZXNjcmlwdGlvbjoJVGhlICJhY21fbWF4X3NpemUiIHByb3BlcnR5IHdpbGwgc2hvdyBtYXgg c2l6ZSBvZg0KPiA+ID4gKwkJYXV0aGVudGljYXRlZCBjb2RlIGV4ZWN1dGlvbiBhcmVhLg0KPiA+ IA0KPiA+IFdoYXQgd291bGQgdXNlcnNwYWNlIHVzZSB0aGlzIGZvcj8NCj4gDQo+IFRoZXNlIHN5 c2ZzIGZpbGVzIGFyZSBqdXN0IGV4cG9ydCBTTVggJiBUWFQgcmVsYXRlZCBpbmZvcm1hdGlvbiB0 byB1c2Vyc3BhY2UuIFNvIHRoYXQgb3RoZXIgZGV2ZWxvcGVycyAob3IgT1NWICYgSVNWKSBjYW4g YmUgYWJsZSB0byBkZXZlbG9wIHR4dCByZWxhdGVkIGFwcGxpY2F0aW9ucyBvciB0b29scyBiYXNl ZCBvbiB0aGVzZSBpbmZvcm1hdGlvbi4NCg0KSWYgdGhleSdyZSBvbmx5IHVzaW5nIGl0IGZvciBk ZWJ1Z2dpbmcgcHVycG9zZXMgdGhlbiBzeXNmcyBwcm9iYWJseQ0KaXNuJ3QgdGhlIHJpZ2h0IHBs YWNlLiBJcyB0aGVyZSBhbnkgcmVhc29uIHRvb2xzIHdvdWxkIG5lZWQgdG8ga25vdyB0aGlzDQpk dXJpbmcgbm9ybWFsIHVzYWdlPw0KDQotLSANCk1hdHRoZXcgR2FycmV0dCB8IG1qZzU5QHNyY2Yu dWNhbS5vcmcNCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752857Ab3EJNIy (ORCPT ); Fri, 10 May 2013 09:08:54 -0400 Received: from tx2ehsobe003.messaging.microsoft.com ([65.55.88.13]:9157 "EHLO tx2outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751247Ab3EJNIw (ORCPT ); Fri, 10 May 2013 09:08:52 -0400 X-Forefront-Antispam-Report: CIP:157.56.236.101;KIP:(null);UIP:(null);IPV:NLI;H:BY2PRD0510HT003.namprd05.prod.outlook.com;RD:none;EFVD:NLI X-SpamScore: -6 X-BigFish: PS-6(zz98dI936eI1432I13e6Kzz1f42h1ee6h1de0h1fdah1202h1e76h1d1ah1d2ah1fc6hzz8275bh8275dhz2fh2a8h668h839h93fhd24hd2bhf0ah1288h12a5h12a9h12bdh137ah13b6h1441h1504h1537h153bh162dh1631h1758h18e1h1946h19b5h1ad9h1b0ah1d0ch1d2eh1d3fh1155h) From: Matthew Garrett To: "Ren, Qiaowei" CC: "linux-kernel@vger.kernel.org" , "platform-driver-x86@vger.kernel.org" , "Wei, Gang" Subject: Re: [PATCH 4/4] driver: provide sysfs interfaces to access SMX parameter Thread-Topic: [PATCH 4/4] driver: provide sysfs interfaces to access SMX parameter Thread-Index: AQHOSvE+ysMfIHdI9EqG5gcExdaKwpj6wt+AgAMpG0CAAHzgAA== Date: Fri, 10 May 2013 13:07:48 +0000 Message-ID: <1368191268.2425.38.camel@x230> References: <1367938519-840-1-git-send-email-qiaowei.ren@intel.com> <1367938519-840-5-git-send-email-qiaowei.ren@intel.com> <1367990697.2425.33.camel@x230> <9E0BE1322F2F2246BD820DA9FC397ADE9AC926@SHSMSX102.ccr.corp.intel.com> In-Reply-To: <9E0BE1322F2F2246BD820DA9FC397ADE9AC926@SHSMSX102.ccr.corp.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.255.84.4] Content-Type: text/plain; charset="utf-8" Content-ID: MIME-Version: 1.0 X-OriginatorOrg: nebula.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id r4AD8wtm022024 On Fri, 2013-05-10 at 07:05 +0000, Ren, Qiaowei wrote: > On 2013-05-08, Matthew Garrett wrote: > > On Tue, 2013-05-07 at 22:55 +0800, Qiaowei Ren wrote: > > > > > +What: /sys/devices/platform/intel_txt/parameter/acm_max_size > > > +Date: May 2013 > > > +KernelVersion: 3.9 > > > +Contact: "Qiaowei Ren" > > > +Description: The "acm_max_size" property will show max size of > > > + authenticated code execution area. > > > > What would userspace use this for? > > These sysfs files are just export SMX & TXT related information to userspace. So that other developers (or OSV & ISV) can be able to develop txt related applications or tools based on these information. If they're only using it for debugging purposes then sysfs probably isn't the right place. Is there any reason tools would need to know this during normal usage? -- Matthew Garrett | mjg59@srcf.ucam.org {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I