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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1317DC433F5 for ; Thu, 6 Oct 2022 08:26:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231182AbiJFI0V (ORCPT ); Thu, 6 Oct 2022 04:26:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230323AbiJFIZ5 (ORCPT ); Thu, 6 Oct 2022 04:25:57 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4021A925A5 for ; Thu, 6 Oct 2022 01:25:20 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-220-ogqXoB6DMemx0vexCKXnvA-1; Thu, 06 Oct 2022 09:25:17 +0100 X-MC-Unique: ogqXoB6DMemx0vexCKXnvA-1 Received: from AcuMS.Aculab.com (10.202.163.6) by AcuMS.aculab.com (10.202.163.6) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Thu, 6 Oct 2022 09:25:15 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.040; Thu, 6 Oct 2022 09:25:15 +0100 From: David Laight To: 'Jim Mattson' , Suraj Jitindar Singh CC: "kvm@vger.kernel.org" , "sjitindarsingh@gmail.com" , "linux-kernel@vger.kernel.org" , "x86@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@suse.de" , "dave.hansen@linux.intel.com" , "seanjc@google.com" , "pbonzini@redhat.com" , "peterz@infradead.org" , "jpoimboe@kernel.org" , "daniel.sneddon@linux.intel.com" , "pawan.kumar.gupta@linux.intel.com" , "benh@kernel.crashing.org" , "stable@vger.kernel.org" Subject: RE: [PATCH] x86/speculation: Mitigate eIBRS PBRSB predictions with WRMSR Thread-Topic: [PATCH] x86/speculation: Mitigate eIBRS PBRSB predictions with WRMSR Thread-Index: AQHY2QnwhQ6wwn4vH0yiWThIF9O5Ta4BBb5Q Date: Thu, 6 Oct 2022 08:25:15 +0000 Message-ID: References: <20221005220227.1959-1-surajjs@amazon.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 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 RnJvbTogSmltIE1hdHRzb24NCj4gU2VudDogMDUgT2N0b2JlciAyMDIyIDIzOjI5DQo+IA0KPiBP biBXZWQsIE9jdCA1LCAyMDIyIGF0IDM6MDMgUE0gU3VyYWogSml0aW5kYXIgU2luZ2ggPHN1cmFq anNAYW1hem9uLmNvbT4gd3JvdGU6DQo+ID4NCj4gPiB0bDtkcjogVGhlIGV4aXN0aW5nIG1pdGln YXRpb24gZm9yIGVJQlJTIFBCUlNCIHByZWRpY3Rpb25zIHVzZXMgYW4gSU5UMyB0bw0KPiA+IGVu c3VyZSBhIGNhbGwgaW5zdHJ1Y3Rpb24gcmV0aXJlcyBiZWZvcmUgYSBmb2xsb3dpbmcgdW5iYWxh bmNlZCBSRVQuIFJlcGxhY2UNCj4gPiB0aGlzIHdpdGggYSBXUk1TUiBzZXJpYWxpc2luZyBpbnN0 cnVjdGlvbiB3aGljaCBoYXMgYSBsb3dlciBwZXJmb3JtYW5jZQ0KPiA+IHBlbmFsdHkuDQo+IA0K PiBUaGUgSU5UMyBpcyBvbmx5IG9uIGEgc3BlY3VsYXRpdmUgcGF0aCBhbmQgc2hvdWxkIG5vdCBp bXBhY3QgcGVyZm9ybWFuY2UuDQoNCkRvZXNuJ3QgdGhhdCBkZXBlbmQgb24gaG93IHF1aWNrbHkg dGhlIGNwdSBjYW4gYWJvcnQgdGhlDQpkZWNvZGUgYW5kIGV4ZWN1dGlvbiBvZiB0aGUgSU5UMyBp bnN0cnVjdGlvbj8NCklOVDMgaXMgYm91bmQgdG8gZ2VuZXJhdGUgYSBsb3Qgb2YgdW9wcyBhbmQv b3IgYmUgbWljcm9jb2RlZC4NCg0KT2xkIGNwdSBjb3VsZG4ndCBhYm9ydCBmcHUgaW5zdHJ1Y3Rp b25zLg0KSUlSQyB0aGUgSW50ZWwgcGVyZm9ybWFuY2UgZ3VpZGUgZXZlbiBzdWdnZXN0ZWQgbm90 IGludGVybGVhdmluZw0KY29kZSBhbmQgZGF0YSBiZWNhdXNlIHRoZSBkYXRhIG1pZ2h0IGdldCBz cGVjdWxhdGl2ZWx5IGV4ZWN1dGVkDQphbmQgdGFrZSBhIGxvbmcgdGltZSB0byBhYm9ydC4NCg0K SSBhY3R1YWxseSB3b25kZXIgd2hldGhlciAnSk1QUyAuJyAoZWIgZmUpIHNob3VsZG4ndCBiZSB1 c2VkDQppbnN0ZWFkIG9mIElOVDMgKGNjKSBiZWNhdXNlIGl0IGlzIGZhc3QgdG8gZGVjb2RlIGFu ZCBleGVjdXRlLg0KQnV0IEknbSBubyBleHBlY3QgaGVyZS4NCg0KCURhdmlkDQoNCi0NClJlZ2lz dGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24g S2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==