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[23.128.96.18]) by mx.google.com with ESMTP id h14si2303436ejl.654.2020.11.11.14.39.16; Wed, 11 Nov 2020 14:39:40 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@amazon.com header.s=amazon201209 header.b=UH8yQAu3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727672AbgKKWhM (ORCPT + 99 others); Wed, 11 Nov 2020 17:37:12 -0500 Received: from smtp-fw-33001.amazon.com ([207.171.190.10]:21079 "EHLO smtp-fw-33001.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727162AbgKKWfK (ORCPT ); Wed, 11 Nov 2020 17:35:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1605134110; x=1636670110; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=KItWozf+ZmCMhG2WY6HZC8mXq55fT7k6OJIXIJ8sJgE=; b=UH8yQAu3fk6GAR9l0RkhOW5LU7hcIWqtZG7xWPZ8WyVKHEMmG9t3zyLg eMNXDsGVVP5w8y4vOa1zJFcxFOMR5yhOhkZDL/EAD7+JFmdllkc0QHk7y ptqpgPYwpfR/vhKsRV5dduvOjbx/7kvgnPCO3iBkfcHfcF9naTnVqzZfi M=; X-IronPort-AV: E=Sophos;i="5.77,470,1596499200"; d="scan'208";a="93160450" Received: from sea32-co-svc-lb4-vlan3.sea.corp.amazon.com (HELO email-inbound-relay-2a-c5104f52.us-west-2.amazon.com) ([10.47.23.38]) by smtp-border-fw-out-33001.sea14.amazon.com with ESMTP; 11 Nov 2020 22:29:53 +0000 Received: from EX13MTAUWC002.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan3.pdx.amazon.com [10.236.137.198]) by email-inbound-relay-2a-c5104f52.us-west-2.amazon.com (Postfix) with ESMTPS id 485AAA0727; Wed, 11 Nov 2020 22:29:50 +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 22:29:49 +0000 Received: from Alexanders-MacBook-Air.local (10.43.161.34) by EX13D20UWC001.ant.amazon.com (10.43.162.244) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 11 Nov 2020 22:29:39 +0000 Subject: Re: [RFC 1/2] x86/bugs: Disable coresched on hardware that does not need it To: Joel Fernandes CC: Nishanth Aravamudan , Julien Desfossez , Peter Zijlstra , "Tim Chen" , Vineeth Pillai , Aaron Lu , Aubrey Li , Thomas Glexiner , LKML , 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: <76aa80c6-b797-f776-90fc-ef4585c41262@amazon.com> Date: Wed, 11 Nov 2020 23:29:37 +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: [10.43.161.34] X-ClientProxiedBy: EX13D49UWB001.ant.amazon.com (10.43.163.72) 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 CgpPbiAxMS4xMS4yMCAyMzoxNSwgSm9lbCBGZXJuYW5kZXMgd3JvdGU6Cj4gCj4gT24gV2VkLCBO b3YgMTEsIDIwMjAgYXQgNToxMyBQTSBKb2VsIEZlcm5hbmRlcyA8am9lbEBqb2VsZmVybmFuZGVz Lm9yZz4gd3JvdGU6Cj4+Cj4+IE9uIFdlZCwgTm92IDExLCAyMDIwIGF0IDU6MDAgUE0gQWxleGFu ZGVyIEdyYWYgPGdyYWZAYW1hem9uLmNvbT4gd3JvdGU6Cj4+PiBPbiAxMS4xMS4yMCAyMjoxNCwg Sm9lbCBGZXJuYW5kZXMgd3JvdGU6Cj4+Pj4+IFNvbWUgaGFyZHdhcmUgc3VjaCBhcyBjZXJ0YWlu IEFNRCB2YXJpYW50cyBkb24ndCBoYXZlIGNyb3NzLUhUIE1EUy9MMVRGCj4+Pj4+IGlzc3Vlcy4g RGV0ZWN0IHRoaXMgYW5kIGRvbid0IGVuYWJsZSBjb3JlIHNjaGVkdWxpbmcgYXMgaXQgY2FuCj4+ Pj4+IG5lZWRsZXNzbHkgc2xvdyB0aGUgZGV2aWNlIGRvbmUuCj4+Pj4+Cj4+Pj4+IGRpZmYgLS1n aXQgYS9hcmNoL3g4Ni9rZXJuZWwvY3B1L2J1Z3MuYyBiL2FyY2gveDg2L2tlcm5lbC9jcHUvYnVn cy5jCj4+Pj4+IGluZGV4IGRlY2U3OWU0ZDFlOS4uMGU2ZTYxZTQ5YjIzIDEwMDY0NAo+Pj4+PiAt LS0gYS9hcmNoL3g4Ni9rZXJuZWwvY3B1L2J1Z3MuYwo+Pj4+PiArKysgYi9hcmNoL3g4Ni9rZXJu ZWwvY3B1L2J1Z3MuYwo+Pj4+PiBAQCAtMTUyLDYgKzE1MiwxNCBAQCB2b2lkIF9faW5pdCBjaGVj a19idWdzKHZvaWQpCj4+Pj4+ICAgICNlbmRpZgo+Pj4+PiAgICB9Cj4+Pj4+Cj4+Pj4+ICsvKgo+ Pj4+PiArICogRG8gbm90IG5lZWQgY29yZSBzY2hlZHVsaW5nIGlmIENQVSBkb2VzIG5vdCBoYXZl IE1EUy9MMVRGIHZ1bG5lcmFiaWxpdHkuCj4+Pj4+ICsgKi8KPj4+Pj4gK2ludCBhcmNoX2FsbG93 X2NvcmVfc2NoZWQodm9pZCkKPj4+Pj4gK3sKPj4+Pj4gKyAgICAgICByZXR1cm4gYm9vdF9jcHVf aGFzX2J1ZyhYODZfQlVHX01EUykgfHwgYm9vdF9jcHVfaGFzX2J1ZyhYODZfQlVHX0wxVEYpOwo+ Pj4KPj4+IENhbiB3ZSBtYWtlIHRoaXMgbW9yZSBnZW5lcmljIGFuZCB1c2VyIHNldHRhYmxlLCBz aW1pbGFyIHRvIHRoZSBMMSBjYWNoZQo+Pj4gZmx1c2hpbmcgbW9kZXMgaW4gS1ZNPwo+Pj4KPj4+ IEkgYW0gbm90IDEwMCUgY29udmluY2VkIHRoYXQgdGhlcmUgYXJlIG5vIG90aGVyIHRocmVhZCBz aWJsaW5nIGF0dGFja3MKPj4+IHBvc3NpYmxlIHdpdGhvdXQgTURTIGFuZCBMMVRGLiBJZiBJJ20g cGFyYW5vaWQsIEkgd2FudCB0byBzdGlsbCBiZSBhYmxlCj4+PiB0byBmb3JjZSBlbmFibGUgY29y ZSBzY2hlZHVsaW5nLgo+Pj4KPj4+IEluIGFkZGl0aW9uLCB3ZSBhcmUgYWxzbyB1c2luZyBjb3Jl IHNjaGVkdWxpbmcgYXMgYSBwb29yIG1hbidzIG1lY2hhbmlzbQo+Pj4gdG8gZ2l2ZSBjdXN0b21l cnMgY29uc2lzdGVudCBwZXJmb3JtYW5jZSBmb3IgdmlydHVhbCBtYWNoaW5lIHRocmVhZAo+Pj4g c2libGluZ3MuIFRoaXMgaXMgaW1wb3J0YW50IGlycmVzcGVjdGl2ZSBvZiBDUFUgYnVncy4gSW4g c3VjaCBhCj4+PiBzY2VuYXJpbywgSSB3YW50IHRvIGZvcmNlIGVuYWJsZSBjb3JlIHNjaGVkdWxp bmcuCj4+Cj4+IE9rLCAgSSBjYW4gbWFrZSBpdCBuZXcga2VybmVsIGNvbW1hbmQgbGluZSBvcHRp b24gd2l0aDoKPj4gY29yZXNjaGVkPW9uCj4+IGNvcmVzY2hlZD1zZWN1cmUgKG9ubHkgaWYgSFcg aGFzIE1EUy9MMVRGKQo+PiBjb3Jlc2NoZWQ9b2ZmCj4gCj4gQWxzbywgSSB3b3VsZCBrZWVwICJz ZWN1cmUiIGFzIHRoZSBkZWZhdWx0LiAgKEFuZCBwcm9iYWJseSwgd2Ugc2hvdWxkCj4gbW9kaWZ5 IHRoZSBpbmZvcm1hdGlvbmFsIG1lc3NhZ2VzIGluIHN5c2ZzIHRvIHJlZmxlY3QgdGhpcy4uKQoK SSBhZ3JlZSB0aGF0ICJzZWN1cmUiIHNob3VsZCBiZSB0aGUgZGVmYXVsdC4gQ2FuIHdlIGFsc28g aW50ZWdyYXRlIGludG8gCnRoZSAibWl0aWdhdGlvbnMiIGtlcm5lbCBjb21tYW5kIGxpbmVbMV0g Zm9yIHRoaXM/CgoKQWxleAoKWzFdIApodHRwczovL2dpdC5rZXJuZWwub3JnL3B1Yi9zY20vbGlu dXgva2VybmVsL2dpdC90b3J2YWxkcy9saW51eC5naXQvdHJlZS9Eb2N1bWVudGF0aW9uL2FkbWlu LWd1aWRlL2tlcm5lbC1wYXJhbWV0ZXJzLnR4dCNuMjgzOQoKCgpBbWF6b24gRGV2ZWxvcG1lbnQg Q2VudGVyIEdlcm1hbnkgR21iSApLcmF1c2Vuc3RyLiAzOAoxMDExNyBCZXJsaW4KR2VzY2hhZWZ0 c2Z1ZWhydW5nOiBDaHJpc3RpYW4gU2NobGFlZ2VyLCBKb25hdGhhbiBXZWlzcwpFaW5nZXRyYWdl biBhbSBBbXRzZ2VyaWNodCBDaGFybG90dGVuYnVyZyB1bnRlciBIUkIgMTQ5MTczIEIKU2l0ejog QmVybGluClVzdC1JRDogREUgMjg5IDIzNyA4NzkKCgo=