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 D72D8CA5507 for ; Wed, 13 Sep 2023 08:25:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238531AbjIMI0C (ORCPT ); Wed, 13 Sep 2023 04:26:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238826AbjIMI0B (ORCPT ); Wed, 13 Sep 2023 04:26:01 -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 ESMTP id 5CED910C0 for ; Wed, 13 Sep 2023 01:25:57 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with both STARTTLS and AUTH (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-192-lGiFXdsMNTWbQGXrkH0Nsw-1; Wed, 13 Sep 2023 09:25:43 +0100 X-MC-Unique: lGiFXdsMNTWbQGXrkH0Nsw-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Wed, 13 Sep 2023 09:25:40 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Wed, 13 Sep 2023 09:25:40 +0100 From: David Laight To: 'Linus Torvalds' CC: Mateusz Guzik , "linux-kernel@vger.kernel.org" , "linux-arch@vger.kernel.org" , "bp@alien8.de" Subject: RE: [PATCH v2] x86: bring back rep movsq for user access on CPUs without ERMS Thread-Topic: [PATCH v2] x86: bring back rep movsq for user access on CPUs without ERMS Thread-Index: AQHZ23Vdq8Esj5k0zUGYupOb09r6RrAF7nHAgAAb1ICAABQQEIANxBwAgAGZkGCAAg/ggIAAEt9wgAAOawCAAM6MQA== Date: Wed, 13 Sep 2023 08:25:40 +0000 Message-ID: References: <20230830140315.2666490-1-mjguzik@gmail.com> <27ba3536633c4e43b65f1dcd0a82c0de@AcuMS.aculab.com> <9a5dd401bf154a0aace0e5f781a3580c@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 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-arch@vger.kernel.org RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMTIgU2VwdGVtYmVyIDIwMjMgMjE6NDgNCj4g DQo+IE9uIFR1ZSwgMTIgU2VwdCAyMDIzIGF0IDEyOjQxLCBEYXZpZCBMYWlnaHQgPERhdmlkLkxh aWdodEBhY3VsYWIuY29tPiB3cm90ZToNCj4gPg0KPiA+IFdoYXQgSSBmb3VuZCBzZWVtZWQgdG8g aW1wbHkgdGhhdCAncmVwIG1vdnNxJyB1c2VkIHRoZSBzYW1lIGludGVybmFsDQo+ID4gbG9naWMg YXMgJ3JlcCBtb3ZzYicgKHByZXR0eSBlYXN5IHRvIGRvIGluIGhhcmR3YXJlKQ0KPiANCj4gQ2hy aXN0Lg0KPiANCj4gSSB0b2xkIHlvdS4gSXQncyBwcmV0dHkgZWFzeSBpbiBoYXJkd2FyZSAgQVMg TE9ORyBBUyBJVCdTIEFMSUdORUQuDQo+IA0KPiBBbmQgaWYgaXQncyB1bmFsaWduZWQsICJyZXAg bW92c3EiIGlzIEZVTkRBTUVOVEFMTFkgSEFSREVSLg0KDQpGb3IgY2FjaGVkIG1lbW9yeSBpdCBv bmx5IGhhcyB0byBhcHBlYXIgdG8gaGF2ZSB1c2VkIDggYnl0ZQ0KYWNjZXNzZXMuDQpTbyBpbiB0 aGUgc2FtZSB3YXkgdGhhdCAncmVwIG1vdnNiJyBjb3VsZCBiZSBvcHRpbWlzZWQgdG8gZG8NCmNh Y2hlIGxpbmUgc2l6ZWQgcmVhZHMgYW5kIHdyaXRlcyBldmVuIGlmIHRoZSBhZGRyZXNzIGFyZQ0K Y29tcGxldGVseSBtaXNhbGlnbmVkICdyZXAgbW92c3EnIGNvdWxkIHVzZSBleGFjdGx5IHRoZSBz YW1lDQpoYXJkd2FyZSBsb2dpYyB3aXRoIGEgYnl0ZSBjb3VudCB0aGF0IGlzIDggdGltZXMgbGFy Z2VyLg0KDQpUaGUgb25seSBzdWJ0bGV0eSBpcyB0aGF0IHRoZSByZWFkIGxlbmd0aCB3b3VsZCBu ZWVkIG1hc2tpbmcNCnRvIGEgbXVsdGlwbGUgb2YgOCBpZiB0aGVyZSBpcyBhIHBhZ2UgZmF1bHQg b24gYSBtaXNhbGlnbmVkDQpyZWFkIHNpZGUgKHNvIHRoYXQgYSBtdWx0aXBsZSBvZiA4IGJ5dGVz IHdvdWxkIGJlIHdyaXR0ZW4pLg0KVGhhdCB3b3VsZG4ndCByZWFsbHkgYmUgaGFyZC4NCg0KSSBk ZWZpbml0ZWx5IHNhdyBleGFjdGx5IHRoZSBzYW1lIG51bWJlciBvZiBieXRlcy9jbG9jaw0KZm9y ICdyZXAgbW92c2InIGFuZCAncmVwIG1vdnNxJyB3aGVuIHRoZSBkZXN0aW5hdGlvbiB3YXMNCm1p c2FsaWduZWQuDQpUaGUgYWxpZ25tZW50IG1hZGUgbm8gZGlmZmVyZW5jZSBleGNlcHQgdGhhdCBh IG11bHRpcGxlDQpvZiAzMiByYW4gKGFib3V0KSB0d2ljZSBhcyBmYXN0Lg0KSSBldmVuIGRvdWJs ZS1jaGVja2VkIHRoZSBkaXNhc3NlbWJseSB0byBtYWtlIHN1cmUgSSB3YXMNCnJ1bm5pbmcgdGhl IHJpZ2h0IGNvZGUuDQoNClNvIGl0IGxvb2tzIGxpa2UgdGhlIEludGVsIGhhcmR3YXJlIGVuZ2lu ZWVycyBoYXZlIHNvbHZlZA0KdGhlICdGVU5EQU1FTlRBTExZIEhBUkRFUicgcHJvYmxlbS4NCg0K CURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBN b3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAx Mzk3Mzg2IChXYWxlcykNCg==