Received: by 2002:a25:ab43:0:0:0:0:0 with SMTP id u61csp8882519ybi; Thu, 6 Jun 2019 22:53:40 -0700 (PDT) X-Google-Smtp-Source: APXvYqxxPSYi98wmaB5zQfP/c4Q8Gli8SCmG3DpcBuGcsS2rtmAYMYDm4J0UsAIS/6XECcwasQA9 X-Received: by 2002:a63:eb55:: with SMTP id b21mr1259162pgk.67.1559886820091; Thu, 06 Jun 2019 22:53:40 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1559886820; cv=none; d=google.com; s=arc-20160816; b=QP6VYcE8IKfZbFqobkQDBP+cEPyGauAUSmK7FCyUe8KZMt3zcQ3Q0Mralmi0Qglbpl HwvhvvdwYEY434MysXi5OXozlQS7Q2YUU+dIFmBj75MTjyZmyViIp6mgLXvxdBG9GLwr bz0TtkqAiYPh+7msHNV/92VnnEP5GaYGxjvsi8hdH5HfgoBuiZx3TncZ7XriNEduqV7v As4Z/jRBcOTggdZG4xo7/i8imyKV67WXAIGZ7N281rTCOrkypp17+OO4B7OaLgfw71sI qLz7AXr+gmNbegY8f0a5oBlrN4/cKU+nyDKkW8qtlUdx63OJD3upHuMpZfKDM/f1czee BJfw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:content-transfer-encoding :content-id:content-language:accept-language:in-reply-to:references :message-id:date:thread-index:thread-topic:subject:cc:to:from :dkim-signature; bh=RXAnmXirvmyEqIvSdkt25aZbde3fhOGHrPepgF7DfEo=; b=jYihJvlUQsCuBSwHZcLOo4pDxSJeg16C0Z/YN9grCdaAxrCrCe7JOs2M0JV1mVHTWn +gl3DdnUPtjeO+YFlwVX9tAAdoLdC5wXZatGoS3zH+5aU7eISDvr1U7wfp7J3ytV9dGQ apcZMAzSQKyC2WeYIxep+02USvazcm1UhKbdGCFgTr4i++4MmoXNp/oHcI/mehKSRNQo BgU8K3Z7c1ZamQ2EEWe76BIaj2fKvvN+AJzpVEhHkY4NHMohbbyTz0Dxx05thOk5KSdX 45LYqIteYnJ34Lo2+BPi8C2fan8APQ9BzljFQjUSE5ijZxsx9ewOqegkfRiQc9b7yeRq W7gA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@vmware.com header.s=selector2 header.b=gFhxhuJW; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=vmware.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id x7si1071177plv.130.2019.06.06.22.53.23; Thu, 06 Jun 2019 22:53:40 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@vmware.com header.s=selector2 header.b=gFhxhuJW; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=vmware.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726736AbfFGFlq (ORCPT + 99 others); Fri, 7 Jun 2019 01:41:46 -0400 Received: from mail-eopbgr690041.outbound.protection.outlook.com ([40.107.69.41]:64494 "EHLO NAM04-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725772AbfFGFlq (ORCPT ); Fri, 7 Jun 2019 01:41:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vmware.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=RXAnmXirvmyEqIvSdkt25aZbde3fhOGHrPepgF7DfEo=; b=gFhxhuJW6DKcGP2BLlANnpNgJBGQ9KxSknNgvCE8PeN0xCn7tj1LI/e14ArEUhJkJ650Z1AAxaUpcldv8XzNIx3OGy3M21ZNAW306iFZP9e0iDgUPOc9IdCSQg1U2Kok9mJOcKsOUS8wWdJnObWVnIaO0U5DmGzaJ1nh0iGGaUk= Received: from BL0PR05MB4772.namprd05.prod.outlook.com (20.177.145.81) by BL0PR05MB5569.namprd05.prod.outlook.com (10.167.240.78) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1965.12; Fri, 7 Jun 2019 05:41:42 +0000 Received: from BL0PR05MB4772.namprd05.prod.outlook.com ([fe80::ac1f:2cd2:fa9c:a886]) by BL0PR05MB4772.namprd05.prod.outlook.com ([fe80::ac1f:2cd2:fa9c:a886%6]) with mapi id 15.20.1965.011; Fri, 7 Jun 2019 05:41:42 +0000 From: Nadav Amit To: Peter Zijlstra CC: the arch/x86 maintainers , LKML , Ard Biesheuvel , Andy Lutomirski , Steven Rostedt , Ingo Molnar , Thomas Gleixner , Linus Torvalds , Masami Hiramatsu , Jason Baron , Jiri Kosina , David Laight , Borislav Petkov , Julia Cartwright , Jessica Yu , "H. Peter Anvin" , Rasmus Villemoes , Edward Cree , Daniel Bristot de Oliveira Subject: Re: [PATCH 08/15] x86/alternatives: Teach text_poke_bp() to emulate instructions Thread-Topic: [PATCH 08/15] x86/alternatives: Teach text_poke_bp() to emulate instructions Thread-Index: AQHVG6Hh/1D55TFaG0m2GIoqEoQysaaPsBmA Date: Fri, 7 Jun 2019 05:41:42 +0000 Message-ID: <7C13A4B6-6D5B-44C4-B238-58DC5926D7E1@vmware.com> References: <20190605130753.327195108@infradead.org> <20190605131945.005681046@infradead.org> In-Reply-To: <20190605131945.005681046@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=namit@vmware.com; x-originating-ip: [66.170.99.2] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 482eeeff-9204-4116-8a74-08d6eb0ad220 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:BL0PR05MB5569; x-ms-traffictypediagnostic: BL0PR05MB5569: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4714; x-forefront-prvs: 0061C35778 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(376002)(396003)(136003)(39860400002)(366004)(346002)(199004)(189003)(8936002)(33656002)(6512007)(256004)(14444005)(66476007)(76176011)(6246003)(64756008)(316002)(26005)(25786009)(476003)(71200400001)(71190400001)(83716004)(66946007)(82746002)(99286004)(102836004)(6506007)(186003)(53546011)(2616005)(6916009)(54906003)(6436002)(305945005)(14454004)(478600001)(73956011)(36756003)(7736002)(86362001)(76116006)(68736007)(66556008)(91956017)(7416002)(4326008)(2906002)(11346002)(66446008)(5660300002)(3846002)(446003)(81156014)(6116002)(81166006)(486006)(53936002)(8676002)(229853002)(66066001)(6486002);DIR:OUT;SFP:1101;SCL:1;SRVR:BL0PR05MB5569;H:BL0PR05MB4772.namprd05.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: vmware.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: pQ3NbK66Xbo0CpQ8/yCBaC0ySlycb/DVRosgXnZ4aMq9o09V7h1RuPCTDeHfzie++/q/6klyElpWrR82TRtd3VOaF9SyAwg8i/2N52jYyCa9UFHmhFXsRjNXwrHorh/XZ0xEGNmAL8c0uZlJpKe6tMQQMKGoQhTcy6N4JtF5OC+VsM+YVTFhcM+ouQCVHHBAc8IQioXF6FZmZez2lpzrB4urfCIVgIVmYuSeNpuwsWDLxR+a3Tu927vgml4e3hMVu5G43jseWZvTGkAskNTyur1RZe2wuyI+aa6h/aZjnx5fANSyFvnyWdAzV7tnd2YfrFAJU0RFh7TZ1DH1bdIlK9sogTeHR4mKqv8dg9WU4IbH3gLzYuX7HxnD9Al5Ev0e1HLkBguudFgLfTiCHo7HuoFQot4BDAQxysmpCvxo+C0= Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: vmware.com X-MS-Exchange-CrossTenant-Network-Message-Id: 482eeeff-9204-4116-8a74-08d6eb0ad220 X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Jun 2019 05:41:42.6132 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b39138ca-3cee-4b4a-a4d6-cd83d9dd62f0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: namit@vmware.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR05MB5569 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PiBPbiBKdW4gNSwgMjAxOSwgYXQgNjowOCBBTSwgUGV0ZXIgWmlqbHN0cmEgPHBldGVyekBpbmZy YWRlYWQub3JnPiB3cm90ZToNCj4gDQo+IEluIHByZXBhcmF0aW9uIGZvciBzdGF0aWNfY2FsbCBz dXBwb3J0LCB0ZWFjaCB0ZXh0X3Bva2VfYnAoKSB0bw0KPiBlbXVsYXRlIGluc3RydWN0aW9ucywg aW5jbHVkaW5nIENBTEwuDQo+IA0KPiBUaGUgY3VycmVudCB0ZXh0X3Bva2VfYnAoKSB0YWtlcyBh IEBoYW5kbGVyIGFyZ3VtZW50IHdoaWNoIGlzIHVzZWQgYXMNCj4gYSBqdW1wIHRhcmdldCB3aGVu IHRoZSB0ZW1wb3JhcnkgSU5UMyBpcyBoaXQgYnkgYSBkaWZmZXJlbnQgQ1BVLg0KPiANCj4gV2hl biBwYXRjaGluZyBDQUxMIGluc3RydWN0aW9ucywgdGhpcyBkb2Vzbid0IHdvcmsgYmVjYXVzZSB3 ZSdkIG1pc3MNCj4gdGhlIFBVU0ggb2YgdGhlIHJldHVybiBhZGRyZXNzLiBJbnN0ZWFkLCB0ZWFj aCBwb2tlX2ludDNfaGFuZGxlcigpIHRvDQo+IGVtdWxhdGUgYW4gaW5zdHJ1Y3Rpb24sIHR5cGlj YWxseSB0aGUgaW5zdHJ1Y3Rpb24gd2UncmUgcGF0Y2hpbmcgaW4uDQo+IA0KPiBUaGlzIGZpdHMg YWxtb3N0IGFsbCB0ZXh0X3Bva2VfYnAoKSB1c2VycywgZXhjZXB0DQo+IGFyY2hfdW5vcHRpbWl6 ZV9rcHJvYmUoKSB3aGljaCByZXN0b3JlcyByYW5kb20gdGV4dCwgYW5kIGZvciB0aGF0IHNpdGUN Cj4gd2UgaGF2ZSB0byBidWlsZCBhbiBleHBsaWNpdCBlbXVsYXRlIGluc3RydWN0aW9uLg0KPiAN Cj4gQ2M6IERhbmllbCBCcmlzdG90IGRlIE9saXZlaXJhIDxicmlzdG90QHJlZGhhdC5jb20+DQo+ IENjOiBOYWRhdiBBbWl0IDxuYW1pdEB2bXdhcmUuY29tPg0KPiBTaWduZWQtb2ZmLWJ5OiBQZXRl ciBaaWpsc3RyYSAoSW50ZWwpIDxwZXRlcnpAaW5mcmFkZWFkLm9yZz4NCj4gLS0tDQo+IGFyY2gv eDg2L2luY2x1ZGUvYXNtL3RleHQtcGF0Y2hpbmcuaCB8ICAgIDIgLQ0KPiBhcmNoL3g4Ni9rZXJu ZWwvYWx0ZXJuYXRpdmUuYyAgICAgICAgfCAgIDQ3ICsrKysrKysrKysrKysrKysrKysrKysrKysr LS0tLS0tLS0tDQo+IGFyY2gveDg2L2tlcm5lbC9qdW1wX2xhYmVsLmMgICAgICAgICB8ICAgIDMg LS0NCj4gYXJjaC94ODYva2VybmVsL2twcm9iZXMvb3B0LmMgICAgICAgIHwgICAxMSArKysrKy0t LQ0KPiA0IGZpbGVzIGNoYW5nZWQsIDQ2IGluc2VydGlvbnMoKyksIDE3IGRlbGV0aW9ucygtKQ0K PiANCj4gLS0tIGEvYXJjaC94ODYvaW5jbHVkZS9hc20vdGV4dC1wYXRjaGluZy5oDQo+ICsrKyBi L2FyY2gveDg2L2luY2x1ZGUvYXNtL3RleHQtcGF0Y2hpbmcuaA0KPiBAQCAtMzcsNyArMzcsNyBA QCBleHRlcm4gdm9pZCB0ZXh0X3Bva2VfZWFybHkodm9pZCAqYWRkciwNCj4gZXh0ZXJuIHZvaWQg KnRleHRfcG9rZSh2b2lkICphZGRyLCBjb25zdCB2b2lkICpvcGNvZGUsIHNpemVfdCBsZW4pOw0K PiBleHRlcm4gdm9pZCAqdGV4dF9wb2tlX2tnZGIodm9pZCAqYWRkciwgY29uc3Qgdm9pZCAqb3Bj b2RlLCBzaXplX3QgbGVuKTsNCj4gZXh0ZXJuIGludCBwb2tlX2ludDNfaGFuZGxlcihzdHJ1Y3Qg cHRfcmVncyAqcmVncyk7DQo+IC1leHRlcm4gdm9pZCB0ZXh0X3Bva2VfYnAodm9pZCAqYWRkciwg Y29uc3Qgdm9pZCAqb3Bjb2RlLCBzaXplX3QgbGVuLCB2b2lkICpoYW5kbGVyKTsNCj4gK2V4dGVy biB2b2lkIHRleHRfcG9rZV9icCh2b2lkICphZGRyLCBjb25zdCB2b2lkICpvcGNvZGUsIHNpemVf dCBsZW4sIGNvbnN0IHZvaWQgKmVtdWxhdGUpOw0KPiBleHRlcm4gaW50IGFmdGVyX2Jvb3RtZW07 DQo+IGV4dGVybiBfX3JvX2FmdGVyX2luaXQgc3RydWN0IG1tX3N0cnVjdCAqcG9raW5nX21tOw0K PiBleHRlcm4gX19yb19hZnRlcl9pbml0IHVuc2lnbmVkIGxvbmcgcG9raW5nX2FkZHI7DQo+IC0t LSBhL2FyY2gveDg2L2tlcm5lbC9hbHRlcm5hdGl2ZS5jDQo+ICsrKyBiL2FyY2gveDg2L2tlcm5l bC9hbHRlcm5hdGl2ZS5jDQo+IEBAIC05MjEsMTkgKzkyMSwyNSBAQCBzdGF0aWMgdm9pZCBkb19z eW5jX2NvcmUodm9pZCAqaW5mbykNCj4gfQ0KPiANCj4gc3RhdGljIGJvb2wgYnBfcGF0Y2hpbmdf aW5fcHJvZ3Jlc3M7DQo+IC1zdGF0aWMgdm9pZCAqYnBfaW50M19oYW5kbGVyLCAqYnBfaW50M19h ZGRyOw0KPiArc3RhdGljIGNvbnN0IHZvaWQgKmJwX2ludDNfb3Bjb2RlLCAqYnBfaW50M19hZGRy Ow0KPiANCj4gaW50IHBva2VfaW50M19oYW5kbGVyKHN0cnVjdCBwdF9yZWdzICpyZWdzKQ0KPiB7 DQo+ICsJbG9uZyBpcCA9IHJlZ3MtPmlwIC0gSU5UM19JTlNOX1NJWkUgKyBDQUxMX0lOU05fU0la RTsNCj4gKwlzdHJ1Y3Qgb3Bjb2RlIHsNCj4gKwkJdTggaW5zbjsNCj4gKwkJczMyIHJlbDsNCj4g Kwl9IF9fcGFja2VkIG9wY29kZTsNCj4gKw0KPiAJLyoNCj4gCSAqIEhhdmluZyBvYnNlcnZlZCBv dXIgSU5UMyBpbnN0cnVjdGlvbiwgd2Ugbm93IG11c3Qgb2JzZXJ2ZQ0KPiAJICogYnBfcGF0Y2hp bmdfaW5fcHJvZ3Jlc3MuDQo+IAkgKg0KPiAtCSAqIAlpbl9wcm9ncmVzcyA9IFRSVUUJCUlOVDMN Cj4gLQkgKiAJV01CCQkJCVJNQg0KPiAtCSAqIAl3cml0ZSBJTlQzCQkJaWYgKGluX3Byb2dyZXNz KQ0KPiArCSAqCWluX3Byb2dyZXNzID0gVFJVRQkJSU5UMw0KPiArCSAqCVdNQgkJCQlSTUINCj4g KwkgKgl3cml0ZSBJTlQzCQkJaWYgKGluX3Byb2dyZXNzKQ0KDQpJIGRvbuKAmXQgc2VlIHdoYXQg aGFzIGNoYW5nZWQgaW4gdGhpcyBjaHVua+KApiBXaGl0ZXNwYWNlcz8NCg0KPiAJICoNCj4gLQkg KiBJZGVtIGZvciBicF9pbnQzX2hhbmRsZXIuDQo+ICsJICogSWRlbSBmb3IgYnBfaW50M19vcGNv ZGUuDQo+IAkgKi8NCj4gCXNtcF9ybWIoKTsNCj4gDQo+IEBAIC05NDMsOCArOTQ5LDIxIEBAIGlu dCBwb2tlX2ludDNfaGFuZGxlcihzdHJ1Y3QgcHRfcmVncyAqcmUNCj4gCWlmICh1c2VyX21vZGUo cmVncykgfHwgcmVncy0+aXAgIT0gKHVuc2lnbmVkIGxvbmcpYnBfaW50M19hZGRyKQ0KPiAJCXJl dHVybiAwOw0KPiANCj4gLQkvKiBzZXQgdXAgdGhlIHNwZWNpZmllZCBicmVha3BvaW50IGhhbmRs ZXIgKi8NCj4gLQlyZWdzLT5pcCA9ICh1bnNpZ25lZCBsb25nKSBicF9pbnQzX2hhbmRsZXI7DQo+ ICsJb3Bjb2RlID0gKihzdHJ1Y3Qgb3Bjb2RlICopYnBfaW50M19vcGNvZGU7DQo+ICsNCj4gKwlz d2l0Y2ggKG9wY29kZS5pbnNuKSB7DQo+ICsJY2FzZSAweEU4OiAvKiBDQUxMICovDQo+ICsJCWlu dDNfZW11bGF0ZV9jYWxsKHJlZ3MsIGlwICsgb3Bjb2RlLnJlbCk7DQo+ICsJCWJyZWFrOw0KPiAr DQo+ICsJY2FzZSAweEU5OiAvKiBKTVAgKi8NCj4gKwkJaW50M19lbXVsYXRlX2ptcChyZWdzLCBp cCArIG9wY29kZS5yZWwpOw0KPiArCQlicmVhazsNCg0KQ29uc2lkZXIgdXNpbmcgUkVMQVRJVkVD QUxMX09QQ09ERSBhbmQgUkVMQVRJVkVKVU1QX09QQ09ERSBpbnN0ZWFkIG9mIHRoZQ0KY29uc3Rh bnRzICgweEU4LCAweEU5KSwganVzdCBhcyB5b3UgZG8gbGF0ZXIgaW4gdGhlIHBhdGNoLg0KDQo=