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=-11.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 4059EC388F9 for ; Wed, 11 Nov 2020 22:00:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF3CA2087D for ; Wed, 11 Nov 2020 22:00:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="fYBA/j2I" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726196AbgKKWAj (ORCPT ); Wed, 11 Nov 2020 17:00:39 -0500 Received: from smtp-fw-4101.amazon.com ([72.21.198.25]:47698 "EHLO smtp-fw-4101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725933AbgKKWAj (ORCPT ); Wed, 11 Nov 2020 17:00:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1605132039; x=1636668039; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=PdYNU1jv677uCYyrbOqBu2wDm1dDg/luctKGPIAv69Y=; b=fYBA/j2I7Qg8X9jOIM3yYpJyznBFQqUDVczJqIzfNgcDiIpdEt1jq5BB ShFRWyH41vL+jttbZAfpoan1ymzyOeM5+thPIWyDtIICXdO+UN5+WxfdN OwMuZEaqXaNRygEdxdIdn1gNOtDkfGx+99VaAma2r2vrTIMpvYlx8zw5E s=; X-IronPort-AV: E=Sophos;i="5.77,470,1596499200"; d="scan'208";a="63676999" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-1a-821c648d.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-4101.iad4.amazon.com with ESMTP; 11 Nov 2020 22:00:31 +0000 Received: from EX13MTAUWC002.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-1a-821c648d.us-east-1.amazon.com (Postfix) with ESMTPS id 96EBFA1FB7; Wed, 11 Nov 2020 22:00:26 +0000 (UTC) Received: from EX13D20UWC001.ant.amazon.com (10.43.162.244) by EX13MTAUWC002.ant.amazon.com (10.43.162.240) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 11 Nov 2020 22:00:26 +0000 Received: from Alexanders-MacBook-Air.local (10.43.160.21) by EX13D20UWC001.ant.amazon.com (10.43.162.244) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 11 Nov 2020 22:00:15 +0000 Subject: Re: [RFC 1/2] x86/bugs: Disable coresched on hardware that does not need it To: Joel Fernandes , Nishanth Aravamudan , Julien Desfossez , Peter Zijlstra , "Tim Chen" , Vineeth Pillai , Aaron Lu , Aubrey Li , Thomas Glexiner , LKML CC: Ingo Molnar , Linus Torvalds , Frederic Weisbecker , Kees Cook , Greg Kerr , Phil Auld , Valentin Schneider , "Mel Gorman" , Pawan Gupta , Paolo Bonzini , , Chen Yu , Christian Brauner , Agata Gruza , "Antonio Gomez Iglesias" , , Dario Faggioli , Paul Turner , "Steven Rostedt" , Patrick Bellasi , =?UTF-8?B?YmVuYmppYW5nKOiSi+W9qik=?= , "Alexandre Chartre" , , , Dhaval Giani , Junaid Shahid , Jesse Barnes , "Hyser,Chris" , Ben Segall , Josh Don , Hao Luo , "Anand K. Mistry" , Borislav Petkov , Daniel Bristot de Oliveira , "Dietmar Eggemann" , "H. Peter Anvin" , "Ingo Molnar" , Juri Lelli , Mel Gorman , Mike Rapoport , Tom Lendacky , Tony Luck , Vincent Guittot , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" References: <20201111211011.1381848-1-joel@joelfernandes.org> <20201111211011.1381848-2-joel@joelfernandes.org> From: Alexander Graf Message-ID: Date: Wed, 11 Nov 2020 23:00:13 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.43.160.21] X-ClientProxiedBy: EX13D49UWC001.ant.amazon.com (10.43.162.217) To EX13D20UWC001.ant.amazon.com (10.43.162.244) Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CgpPbiAxMS4xMS4yMCAyMjoxNCwgSm9lbCBGZXJuYW5kZXMgd3JvdGU6Cj4gCj4gU29ycnksIGZv cmdvdCB0byBDQyArVG9tIExlbmRhY2t5IC4gUGxlYXNlIHRha2UgYSBsb29rIFRvbSwgdGhhbmtz Lgo+IAo+IE9uIFdlZCwgTm92IDExLCAyMDIwIGF0IDQ6MTAgUE0gSm9lbCBGZXJuYW5kZXMgKEdv b2dsZSkKPiA8am9lbEBqb2VsZmVybmFuZGVzLm9yZz4gd3JvdGU6Cj4+Cj4+IFNvbWUgaGFyZHdh cmUgc3VjaCBhcyBjZXJ0YWluIEFNRCB2YXJpYW50cyBkb24ndCBoYXZlIGNyb3NzLUhUIE1EUy9M MVRGCj4+IGlzc3Vlcy4gRGV0ZWN0IHRoaXMgYW5kIGRvbid0IGVuYWJsZSBjb3JlIHNjaGVkdWxp bmcgYXMgaXQgY2FuCj4+IG5lZWRsZXNzbHkgc2xvdyB0aGUgZGV2aWNlIGRvbmUuCj4+Cj4+IFNp Z25lZC1vZmYtYnk6IEpvZWwgRmVybmFuZGVzIChHb29nbGUpIDxqb2VsQGpvZWxmZXJuYW5kZXMu b3JnPgo+PiAtLS0KPj4gICBhcmNoL3g4Ni9rZXJuZWwvY3B1L2J1Z3MuYyB8IDggKysrKysrKysK Pj4gICBrZXJuZWwvc2NoZWQvY29yZS5jICAgICAgICB8IDcgKysrKysrKwo+PiAgIGtlcm5lbC9z Y2hlZC9zY2hlZC5oICAgICAgIHwgNSArKysrKwo+PiAgIDMgZmlsZXMgY2hhbmdlZCwgMjAgaW5z ZXJ0aW9ucygrKQo+Pgo+PiBkaWZmIC0tZ2l0IGEvYXJjaC94ODYva2VybmVsL2NwdS9idWdzLmMg Yi9hcmNoL3g4Ni9rZXJuZWwvY3B1L2J1Z3MuYwo+PiBpbmRleCBkZWNlNzllNGQxZTkuLjBlNmU2 MWU0OWIyMyAxMDA2NDQKPj4gLS0tIGEvYXJjaC94ODYva2VybmVsL2NwdS9idWdzLmMKPj4gKysr IGIvYXJjaC94ODYva2VybmVsL2NwdS9idWdzLmMKPj4gQEAgLTE1Miw2ICsxNTIsMTQgQEAgdm9p ZCBfX2luaXQgY2hlY2tfYnVncyh2b2lkKQo+PiAgICNlbmRpZgo+PiAgIH0KPj4KPj4gKy8qCj4+ ICsgKiBEbyBub3QgbmVlZCBjb3JlIHNjaGVkdWxpbmcgaWYgQ1BVIGRvZXMgbm90IGhhdmUgTURT L0wxVEYgdnVsbmVyYWJpbGl0eS4KPj4gKyAqLwo+PiAraW50IGFyY2hfYWxsb3dfY29yZV9zY2hl ZCh2b2lkKQo+PiArewo+PiArICAgICAgIHJldHVybiBib290X2NwdV9oYXNfYnVnKFg4Nl9CVUdf TURTKSB8fCBib290X2NwdV9oYXNfYnVnKFg4Nl9CVUdfTDFURik7CgpDYW4gd2UgbWFrZSB0aGlz IG1vcmUgZ2VuZXJpYyBhbmQgdXNlciBzZXR0YWJsZSwgc2ltaWxhciB0byB0aGUgTDEgY2FjaGUg CmZsdXNoaW5nIG1vZGVzIGluIEtWTT8KCkkgYW0gbm90IDEwMCUgY29udmluY2VkIHRoYXQgdGhl cmUgYXJlIG5vIG90aGVyIHRocmVhZCBzaWJsaW5nIGF0dGFja3MgCnBvc3NpYmxlIHdpdGhvdXQg TURTIGFuZCBMMVRGLiBJZiBJJ20gcGFyYW5vaWQsIEkgd2FudCB0byBzdGlsbCBiZSBhYmxlIAp0 byBmb3JjZSBlbmFibGUgY29yZSBzY2hlZHVsaW5nLgoKSW4gYWRkaXRpb24sIHdlIGFyZSBhbHNv IHVzaW5nIGNvcmUgc2NoZWR1bGluZyBhcyBhIHBvb3IgbWFuJ3MgbWVjaGFuaXNtIAp0byBnaXZl IGN1c3RvbWVycyBjb25zaXN0ZW50IHBlcmZvcm1hbmNlIGZvciB2aXJ0dWFsIG1hY2hpbmUgdGhy ZWFkIApzaWJsaW5ncy4gVGhpcyBpcyBpbXBvcnRhbnQgaXJyZXNwZWN0aXZlIG9mIENQVSBidWdz LiBJbiBzdWNoIGEgCnNjZW5hcmlvLCBJIHdhbnQgdG8gZm9yY2UgZW5hYmxlIGNvcmUgc2NoZWR1 bGluZy4KCgpBbGV4CgoKCkFtYXpvbiBEZXZlbG9wbWVudCBDZW50ZXIgR2VybWFueSBHbWJICkty YXVzZW5zdHIuIDM4CjEwMTE3IEJlcmxpbgpHZXNjaGFlZnRzZnVlaHJ1bmc6IENocmlzdGlhbiBT Y2hsYWVnZXIsIEpvbmF0aGFuIFdlaXNzCkVpbmdldHJhZ2VuIGFtIEFtdHNnZXJpY2h0IENoYXJs b3R0ZW5idXJnIHVudGVyIEhSQiAxNDkxNzMgQgpTaXR6OiBCZXJsaW4KVXN0LUlEOiBERSAyODkg MjM3IDg3OQoKCg==