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Lu" CC: Yu-cheng Yu , "x86@kernel.org" , "H. Peter Anvin" , Thomas Gleixner , "Ingo Molnar" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-mm@kvack.org" , "linux-arch@vger.kernel.org" , "linux-api@vger.kernel.org" , Arnd Bergmann , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , Jann Horn , "Jonathan Corbet" , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , "Weijiang Yang" , Pengfei Xu , "Haitao Huang" Subject: RE: [PATCH v26 0/9] Control-flow Enforcement: Indirect Branch Tracking Thread-Topic: [PATCH v26 0/9] Control-flow Enforcement: Indirect Branch Tracking Thread-Index: AQHXO6ae1Nsozyj+DkCGokhshY0p/arKAkvwgAAI5giAAAIBgA== Date: Wed, 28 Apr 2021 15:33:29 +0000 Message-ID: <0c6e1c922bc54326b1121194759565f5@AcuMS.aculab.com> References: <20210427204720.25007-1-yu-cheng.yu@intel.com> <0e03c50ea05440209d620971b9db4f29@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogQW5keSBMdXRvbWlyc2tpDQo+IFNlbnQ6IDI4IEFwcmlsIDIwMjEgMTY6MTUNCj4gDQo+ IE9uIFdlZCwgQXByIDI4LCAyMDIxIGF0IDc6NTcgQU0gSC5KLiBMdSA8aGpsLnRvb2xzQGdtYWls LmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBPbiBXZWQsIEFwciAyOCwgMjAyMSBhdCA3OjUyIEFNIEFu ZHkgTHV0b21pcnNraSA8bHV0b0BrZXJuZWwub3JnPiB3cm90ZToNCj4gPiA+DQo+ID4gPiBPbiBX ZWQsIEFwciAyOCwgMjAyMSBhdCA3OjQ4IEFNIERhdmlkIExhaWdodCA8RGF2aWQuTGFpZ2h0QGFj dWxhYi5jb20+IHdyb3RlOg0KPiA+ID4gPg0KPiA+ID4gPiBGcm9tOiBZdS1jaGVuZyBZdQ0KPiA+ ID4gPiA+IFNlbnQ6IDI3IEFwcmlsIDIwMjEgMjE6NDcNCj4gPiA+ID4gPg0KPiA+ID4gPiA+IENv bnRyb2wtZmxvdyBFbmZvcmNlbWVudCAoQ0VUKSBpcyBhIG5ldyBJbnRlbCBwcm9jZXNzb3IgZmVh dHVyZSB0aGF0IGJsb2Nrcw0KPiA+ID4gPiA+IHJldHVybi9qdW1wLW9yaWVudGVkIHByb2dyYW1t aW5nIGF0dGFja3MuICBEZXRhaWxzIGFyZSBpbiAiSW50ZWwgNjQgYW5kDQo+ID4gPiA+ID4gSUEt MzIgQXJjaGl0ZWN0dXJlcyBTb2Z0d2FyZSBEZXZlbG9wZXIncyBNYW51YWwiIFsxXS4NCj4gPiA+ ID4gLi4uDQo+ID4gPiA+DQo+ID4gPiA+IERvZXMgdGhpcyBmZWF0dXJlIHJlcXVpcmUgdGhhdCAn YmluYXJ5IGJsb2JzJyBmb3Igb3V0IG9mIHRyZWUgZHJpdmVycw0KPiA+ID4gPiBiZSBjb21waWxl ZCBieSBhIHZlcnNpb24gb2YgZ2NjIHRoYXQgYWRkcyB0aGUgRU5EQlJBIGluc3RydWN0aW9ucz8N Cj4gPiA+ID4NCj4gPiA+ID4gSWYgZW5hYmxlZCBmb3IgdXNlcnNwYWNlLCB3aGF0IGhhcHBlbnMg aWYgYW4gb2xkIC5zbyBpcyBkeW5hbWljYWxseQ0KPiA+ID4gPiBsb2FkZWQ/DQo+ID4NCj4gPiBD RVQgd2lsbCBiZSBkaXNhYmxlZCBieSBsZC5zbyBpbiB0aGlzIGNhc2UuDQo+IA0KPiBXaGF0IGlm IGEgcHJvZ3JhbSBzdGFydHMgYSB0aHJlYWQgYW5kIHRoZW4gZGxvcGVucyBhIGxlZ2FjeSAuc28/ DQoNCk9yIGhhcyBzaGFkb3cgc3RhY2sgZW5hYmxlZCBhbmQgb3BlbnMgYSAuc28gdGhhdCB1c2Vz IHJldHBvbGluZXM/DQoNCj4gPiA+ID4gT3IgZG8gYWxsIHVzZXJzcGFjZSBwcm9ncmFtcyBhbmQg bGlicmFyaWVzIGhhdmUgdG8gaGF2ZSBiZWVuIGNvbXBpbGVkDQo+ID4gPiA+IHdpdGggdGhlIEVO REJSQSBpbnN0cnVjdGlvbnM/DQo+ID4NCj4gPiBDb3JyZWN0LiAgbGQgYW5kIGxkLnNvIGNoZWNr IHRoaXMuDQo+ID4NCj4gPiA+IElmIHlvdSBiZWxpZXZlIHRoYXQgdGhlIHVzZXJzcGFjZSB0b29s aW5nIGZvciB0aGUgbGVnYWN5IElCVCB0YWJsZQ0KPiA+ID4gYWN0dWFsbHkgd29ya3MsIHRoZW4g aXQgc2hvdWxkIGp1c3Qgd29yay4gIFl1LWNoZW5nLCBldGM6IGhvdyB3ZWxsDQo+ID4gPiB0ZXN0 ZWQgaXMgaXQ/DQo+ID4gPg0KPiA+DQo+ID4gTGVnYWN5IElCVCBiaXRtYXAgaXNuJ3QgdW51c2Vk IHNpbmNlIGl0IGRvZXNuJ3QgY292ZXIgbGVnYWN5IGNvZGVzDQo+ID4gZ2VuZXJhdGVkIGJ5IGxl Z2FjeSBKSVRzLg0KPiA+DQo+IA0KPiBIb3cgZG9lcyBsZC5zbyBkZWNpZGUgd2hldGhlciBhIGxl Z2FjeSBKSVQgaXMgaW4gdXNlPw0KDQpXaGF0IGlmIHlvdXIgbWFsd2FyZSBqdXN0IHByZWNlZGVz IGl0cyAnanVtcCBpbnRvIHRoZSBtaWRkbGUgb2YgYSBmdW5jdGlvbicNCndpdGggYSAlZHMgc2Vn bWVudCBvdmVycmlkZT8NCg0KSSBtYXkgaGF2ZSBhIHJlYWwgcHJvYmxlbSBoZXJlLg0KV2UgY3Vy cmVudGx5IHJlbGVhc2UgcHJvZ3JhbS9saWJyYXJ5IGJpbmFyaWVzIHRoYXQgcnVuIG9uIExpbnV4 DQpkaXN0cmlidXRpb25zIHRoYXQgZ28gYmFjayBhcyBmYXIgYXMgUkhFTDYgKDIuNi4zMiBrZXJu ZWwgZXJhKS4NClRvIGRvIHRoaXMgZXZlcnl0aGluZyBpcyBjb21waWxlZCBvbiBhIHVzZXJzcGFj ZSBvZiB0aGUgc2FtZSB2aW50YWdlLg0KSSdtIG5vdCBhdCBhbGwgc3VyZSBhIG5ldyBlbm91Z2gg Z2NjIHRvIGdlbmVyYXRlIHRoZSBFTkRCUjY0IGluc3RydWN0aW9ucw0Kd2lsbCBydW4gb24gdGhl IHJlbGV2YW50IHN5c3RlbSAtIGFuZCBtYXkgYmFyZiBvbiB0aGUgc3lzdGVtIGhlYWRlcnMNCmV2 ZW4gaWYgd2UgZ290IGl0IHRvIHJ1bi4NCkkgcmVhbGx5IGRvbid0IHdhbnQgdG8gaGF2ZSB0byBi dWlsZCBtdWx0aXBsZSBjb3BpZXMgb2YgZXZlcnl0aGluZy4NCg0KCURhdmlkDQoNCi0NClJlZ2lz dGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24g S2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==