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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 A58D8C2BA19 for ; Tue, 21 Apr 2020 08:05:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8866B2071C for ; Tue, 21 Apr 2020 08:05:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727120AbgDUIF2 (ORCPT ); Tue, 21 Apr 2020 04:05:28 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:41113 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726935AbgDUIF0 (ORCPT ); Tue, 21 Apr 2020 04:05:26 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-194-bOrZo3U0OfCgfC1rgonSRA-1; Tue, 21 Apr 2020 09:05:23 +0100 X-MC-Unique: bOrZo3U0OfCgfC1rgonSRA-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 21 Apr 2020 09:05:22 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Tue, 21 Apr 2020 09:05:22 +0100 From: David Laight To: 'Ard Biesheuvel' , "Jason A. Donenfeld" CC: "herbert@gondor.apana.org.au" , "linux-crypto@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "ebiggers@google.com" , "stable@vger.kernel.org" Subject: RE: FPU register granularity [Was: Re: [PATCH crypto-stable] crypto: arch/lib - limit simd usage to PAGE_SIZE chunks] Thread-Topic: FPU register granularity [Was: Re: [PATCH crypto-stable] crypto: arch/lib - limit simd usage to PAGE_SIZE chunks] Thread-Index: AQHWF6rUb3STV3+On0alUpvKAanXNqiDN3TA Date: Tue, 21 Apr 2020 08:05:22 +0000 Message-ID: References: <20200420075711.2385190-1-Jason@zx2c4.com> <2cdb57f2cdbd49e9bb1034d01d054bb7@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org RnJvbTogQXJkIEJpZXNoZXV2ZWwNCj4gU2VudDogMjEgQXByaWwgMjAyMCAwODowMg0KPiBPbiBU dWUsIDIxIEFwciAyMDIwIGF0IDA2OjE1LCBKYXNvbiBBLiBEb25lbmZlbGQgPEphc29uQHp4MmM0 LmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBIaSBEYXZpZCwNCj4gPg0KPiA+IE9uIE1vbiwgQXByIDIw LCAyMDIwIGF0IDI6MzIgQU0gRGF2aWQgTGFpZ2h0IDxEYXZpZC5MYWlnaHRAYWN1bGFiLmNvbT4g d3JvdGU6DQo+ID4gPiBNYXliZSBrZXJuZWxfZnBfYmVnaW4oKSBzaG91bGQgYmUgcGFzc2VkIHRo ZSBhZGRyZXNzIG9mIHNvbWV3aGVyZQ0KPiA+ID4gdGhlIGFkZHJlc3Mgb2YgYW4gZnB1IHNhdmUg YXJlYSBidWZmZXIgY2FuIGJlIHdyaXR0ZW4gdG8uDQo+ID4gPiBUaGVuIHRoZSBwcmUtZW1wdGlv biBjb2RlIGNhbiBhbGxvY2F0ZSB0aGUgYnVmZmVyIGFuZCBzYXZlIHRoZQ0KPiA+ID4gc3RhdGUg aW50byBpdC4NCj4gPg0KPiA+IEludGVyZXN0aW5nIGlkZWEuIEl0IGxvb2tzIGxpa2UgYHN0cnVj dCB4cmVnc19zdGF0ZWAgaXMgb25seSA1NzYNCj4gPiBieXRlcy4gVGhhdCdzIG5vdCBleGFjdGx5 IHNtYWxsLCBidXQgaXQncyBub3QgaW5zYW5lbHkgaHVnZSBlaXRoZXIsDQo+ID4gYW5kIG1heWJl IHdlIGNvdWxkIGp1c3RpZmlhYmx5IHN0aWNrIHRoYXQgb24gdGhlIHN0YWNrLCBvciBldmVuDQo+ ID4gcmVzZXJ2ZSBwYXJ0IG9mIHRoZSBzdGFjayBhbGxvY2F0aW9uIGZvciB0aGF0IHRoYXQgdGhl IGZ1bmN0aW9uIHdvdWxkDQo+ID4ga25vdyBhYm91dCwgd2l0aG91dCBuZWVkaW5nIHRvIHNwZWNp ZnkgYW55IGFkZHJlc3MuDQo+ID4NCj4gPiA+IGtlcm5lbF9mcHVfYmVnaW4oKSBvdWdodCBhbHNv IGJlIHBhc3NlZCBhIHBhcmFtZXRlciBzYXlpbmcgd2hpY2gNCj4gPiA+IGZwdSBmZWF0dXJlcyBh cmUgcmVxdWlyZWQsIGFuZCByZXR1cm4gd2hpY2ggYXJlIGFsbG9jYXRlZC4NCj4gPiA+IE9uIHg4 NiB0aGlzIGNvdWxkIGJlIHVzZWQgdG8gY2hlY2sgZm9yIEFWWDUxMiAoZXRjKSB3aGljaCBtYXkg YmUNCj4gPiA+IGF2YWlsYWJsZSBpbiBhbiBJU1IgdW5sZXNzIGl0IGludGVycnVwdGVkIGluc2lk ZSBhIGtlcm5lbF9mcHVfYmVnaW4oKQ0KPiA+ID4gc2VjdGlvbiAoZXRjKS4NCj4gPiA+IEl0IHdv dWxkIGFsc28gYWxsb3cgb3B0aW1pc2F0aW9ucyBpZiBvbmx5IDEgb3IgMiBmcHUgcmVnaXN0ZXJz IGFyZQ0KPiA+ID4gbmVlZGVkIChlZyBmb3Igc29tZSBvZiB0aGUgY3J5cHRvIGZ1bmN0aW9ucykg cmF0aGVyIHRoYW4gdGhlIHdob2xlDQo+ID4gPiBmcHUgcmVnaXN0ZXIgc2V0Lg0KPiA+DQo+ID4g Rm9yIEFWWDUxMiB0aGlzIHByb2JhYmx5IG1ha2VzIHNlbnNlLCBJIHN1cHBvc2UuIEJ1dCBJJ20g bm90IHN1cmUgaWYNCj4gPiB0aGVyZSBhcmUgdG9vIG1hbnkgYml0cyBvZiBjcnlwdG8gY29kZSB0 aGF0IG9ubHkgdXNlIGEgZmV3IHJlZ2lzdGVycy4NCj4gPiBUaGVyZSBhcmUgdGhvc2UgYWNjZWxl cmF0ZWQgbWVtY3B5IHJvdXRpbmVzIGluIGk5MTUgdGhvdWdoIC0tIGV2ZXIgc2VlDQo+ID4gZHJp dmVycy9ncHUvZHJtL2k5MTUvaTkxNV9tZW1jcHkuYz8gc29ydCBvZiB3aWxkLiBCdXQgaWYgd2Ug ZGlkIGdvDQo+ID4gdGhpcyB3YXksIEkgd29uZGVyIGlmIGl0J2QgbWFrZSBzZW5zZSB0byB0b3Rh bGx5IG92ZXJlbmdpbmVlciBpdCBhbmQNCj4gPiB3cml0ZSBhIGdjYy9hcyBwbHVnaW4gdG8gY3Jl YXRlIHRoZSByZWdpc3RlciBtYXNrIGZvciB1cy4gT3IsIG1heWJlDQo+ID4gc29tZSBjaGVja2Vy IGluc2lkZSBvZiBvYmp0b29sIGNvdWxkIGhlbHAgaGVyZS4NCj4gPg0KPiA+IEFjdHVhbGx5LCB0 aG91Z2gsIHRoZSB0aGluZyBJJ3ZlIGJlZW4gd29uZGVyaW5nIGFib3V0IGlzIGFjdHVhbGx5DQo+ ID4gbW92aW5nIGluIHRoZSBjb21wbGV0ZSBvcHBvc2l0ZSBkaXJlY3Rpb246IGlzIHRoZXJlIHNv bWUNCj4gPiBlZmZpY2llbnQtZW5vdWdoIHdheSB0aGF0IHdlIGNvdWxkIGFsbG93IEZQVSByZWdp c3RlcnMgaW4gYWxsIGNvbnRleHRzDQo+ID4gYWx3YXlzLCB3aXRob3V0IHRoZSBuZWVkIGZvciBr ZXJuZWxfZnB1X2JlZ2luL2VuZD8gSSB3YXMgcmV2ZXJzaW5nDQo+ID4gbnRvc2tybmwuZXhlIGFu ZCB3YXMga2luZCBvZiBpbXByZXNzZWQgKG1heWJlIG5vdCB0aGUgcmlnaHQgd29yZD8pIGJ5DQo+ ID4gdGhlaXIganVkaWNpb3VzIHVzZSBvZiB2ZWN0b3Jpc2F0aW9uIGV2ZXJ5d2hlcmUuIEkgYXNz dW1lIGEgbG90IG9mDQo+ID4gdGhhdCBpcyBiZWluZyBnZW5lcmF0ZWQgYnkgdGhlaXIgY29tcGls ZXIsIHdoaWNoIG9mIGNvdXJzZSBnY2MgY291bGQNCj4gPiBkbyBmb3IgdXMgaWYgd2UgbGV0IGl0 LiBJcyB0aGF0IGFuIGludGVyZXN0aW5nIGF2ZW51ZSB0byBjb25zaWRlcj8gT3INCj4gPiBhcmUg eW91IHByZXR0eSBjZXJ0YWluIHRoYXQgaXQnZCBiZSBhIGh1Z2UgbWlzdGFrZSwgd2l0aCBhbg0K PiA+IGlycmV2ZXJzaWJsZSBzcGVlZCBoaXQ/DQo+ID4NCj4gDQo+IFdoZW4gSSBhZGRlZCBzdXBw b3J0IGZvciBrZXJuZWwgbW9kZSBTSU1EIHRvIGFybTY0IG9yaWdpbmFsbHksIHRoZXJlDQo+IHdh cyBhIGtlcm5lbF9uZW9uX2JlZ2luX3BhcnRpYWwoKSB0aGF0IHRvb2sgYW4gaW50IHRvIHNwZWNp ZnkgaG93IG1hbnkNCj4gcmVnaXN0ZXJzIHdlcmUgYmVpbmcgdXNlZCwgdGhlIHJlYXNvbiBiZWlu ZyB0aGF0IE5FT04gcHJlc2VydmUvc3RvcmUNCj4gd2FzIGZ1bGx5IGVhZ2VyIGF0IHRoaXMgcG9p bnQsIGFuZCBhcm02NCBoYXMgMzIgU0lNRCByZWdpc3RlcnMsIG1hbnkNCj4gb2Ygd2hpY2ggd2Vy ZW4ndCByZWFsbHkgdXNlZCwgZS5nLiwgaW4gdGhlIGJhc2ljIGltcGxlbWVudGF0aW9uIG9mIEFF Uw0KPiBiYXNlZCBvbiBzcGVjaWFsIGluc3RydWN0aW9ucy4NCj4gDQo+IFdpdGggdGhlIGludHJv ZHVjdGlvbiBvZiBsYXp5IHJlc3RvcmUsIGFuZCBTVkUgaGFuZGxpbmcgZm9yIHVzZXJzcGFjZSwN Cj4gd2UgZGVjaWRlZCB0byByZW1vdmUgdGhpcyBiZWNhdXNlIGl0IGRpZG4ndCByZWFsbHkgaGVs cCBhbnltb3JlLCBhbmQNCj4gbWFkZSB0aGUgY29kZSBtb3JlIGRpZmZpY3VsdCB0byBtYW5hZ2Uu DQo+IA0KPiBIb3dldmVyLCBJIHRoaW5rIGl0IHdvdWxkIG1ha2Ugc2Vuc2UgdG8gaGF2ZSBzb21l dGhpbmcgbGlrZSB0aGlzIGluDQo+IHRoZSBnZW5lcmFsIGNhc2UuIEkuZS4sIE5FT04gcmVnaXN0 ZXJzIDAtMyBhcmUgYWx3YXlzIHByZXNlcnZlZCB3aGVuDQo+IGFuIGV4Y2VwdGlvbiBvciBpbnRl cnJ1cHQgKG9yIHN5c2NhbGwpIGlzIHRha2VuLCBhbmQgc28gdGhleSBjYW4gYmUNCj4gdXNlZCBh bnl3aGVyZSBpbiB0aGUga2VybmVsLiBJZiB5b3Ugd2FudCB0aGUgd2hvbGUgc2V0LCB5b3Ugd2ls bCBoYXZlDQo+IHRvIHVzZSBiZWdpbi9lbmQgYXMgYmVmb3JlLiBUaGlzIHdvdWxkIGFscmVhZHkg dW5sb2NrIGEgZmV3DQo+IGludGVyZXN0aW5nIGNhc2UsIGxpa2UgbWVtY3B5LCB4b3IsIGFuZCBz ZXF1ZW5jZXMgdGhhdCBjYW4gZWFzaWx5IGJlDQo+IGltcGxlbWVudGVkIHdpdGggb25seSBhIGZl dyByZWdpc3RlcnMgc3VjaCBhcyBpbnN0cnVjdGlvIGJhc2VkIEFFUy4NCj4gDQo+IFVuZm9ydHVu YXRlbHksIHRoZSBjb21waWxlciBuZWVkcyB0byBiZSB0YXVnaHQgYWJvdXQgdGhpcyB0byBiZQ0K PiBjb21wbGV0ZWx5IHVzZWZ1bCwgd2hpY2ggbWVhbnMgbG90cyBvZiBwcm90b3R5cGluZyBhbmQg YmVuY2htYXJraW5nDQo+IHVwZnJvbnQsIGFzIHRoZSBjb250cmFjdCB3aWxsIGJlIHNldCBpbiBz dG9uZSBvbmNlIHRoZSBjb21waWxlcnMgZ2V0DQo+IG9uIGJvYXJkLg0KDQpZb3UgY2FuIGFsd2F5 cyBqdXN0IHVzZSBhc20gd2l0aCBleHBsaWNpdCByZWdpc3RlcnMuDQoNCglEYXZpZA0KDQotDQpS ZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWls dG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMp DQo=