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[209.132.180.67]) by mx.google.com with ESMTP id b1si2770483pgc.807.2018.02.10.07.28.02; Sat, 10 Feb 2018 07:28:52 -0800 (PST) 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; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751057AbeBJP0T (ORCPT + 99 others); Sat, 10 Feb 2018 10:26:19 -0500 Received: from smtp-out6.electric.net ([192.162.217.182]:62045 "EHLO smtp-out6.electric.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750857AbeBJP0S (ORCPT ); Sat, 10 Feb 2018 10:26:18 -0500 Received: from 1ekX2M-0006ec-Vc by out6d.electric.net with emc1-ok (Exim 4.87) (envelope-from ) id 1ekX2Q-0006km-VJ; Sat, 10 Feb 2018 07:26:02 -0800 Received: by emcmailer; Sat, 10 Feb 2018 07:26:02 -0800 Received: from [156.67.243.126] (helo=AcuMS.aculab.com) by out6d.electric.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-SHA384:256) (Exim 4.87) (envelope-from ) id 1ekX2M-0006ec-Vc; Sat, 10 Feb 2018 07:25:58 -0800 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; Sat, 10 Feb 2018 15:26:51 +0000 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; Sat, 10 Feb 2018 15:26:51 +0000 From: David Laight To: 'Denys Vlasenko' , Linus Torvalds , Joerg Roedel CC: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , the arch/x86 maintainers , Linux Kernel Mailing List , linux-mm , Andy Lutomirski , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , "Eduardo Valentin" , Greg KH , "Will Deacon" , "Liguori, Anthony" , Daniel Gruss , Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek , Joerg Roedel Subject: RE: [PATCH 09/31] x86/entry/32: Leave the kernel via trampoline stack Thread-Topic: [PATCH 09/31] x86/entry/32: Leave the kernel via trampoline stack Thread-Index: AQHTocn4duOBYzH6Y06ZOLi7EtO7oqOcWD/A Date: Sat, 10 Feb 2018 15:26:51 +0000 Message-ID: <50431bff2cda445490f5242c1189c8cd@AcuMS.aculab.com> References: <1518168340-9392-1-git-send-email-joro@8bytes.org> <1518168340-9392-10-git-send-email-joro@8bytes.org> 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: [10.202.205.33] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Outbound-IP: 156.67.243.126 X-Env-From: David.Laight@ACULAB.COM X-Proto: esmtps X-Revdns: X-HELO: AcuMS.aculab.com X-TLS: TLSv1.2:ECDHE-RSA-AES256-SHA384:256 X-Authenticated_ID: X-PolicySMART: 3396946, 3397078 X-Virus-Status: Scanned by VirusSMART (c) X-Virus-Status: Scanned by VirusSMART (s) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogRGVueXMgVmxhc2Vua28NCj4gU2VudDogMDkgRmVicnVhcnkgMjAxOCAxNzoxNw0KPiBP biAwMi8wOS8yMDE4IDA2OjA1IFBNLCBMaW51cyBUb3J2YWxkcyB3cm90ZToNCj4gPiBPbiBGcmks IEZlYiA5LCAyMDE4IGF0IDE6MjUgQU0sIEpvZXJnIFJvZWRlbCA8am9yb0A4Ynl0ZXMub3JnPiB3 cm90ZToNCj4gPj4gKw0KPiA+PiArICAgICAgIC8qIENvcHkgb3ZlciB0aGUgc3RhY2stZnJhbWUg Ki8NCj4gPj4gKyAgICAgICBjbGQNCj4gPj4gKyAgICAgICByZXAgbW92c2INCj4gPg0KPiA+IFVn aC4gVGhpcyBpcyBnb2luZyB0byBiZSBob3JyZW5kb3VzLiBNYXliZSBub3Qgbm90aWNlYWJsZSBv biBtb2Rlcm4NCj4gPiBDUFUncywgYnV0IHRoZSB3aG9sZSAzMi1iaXQgY29kZSBpcyBraW5kIG9m IHBvaW50bGVzcyBvbiBhIG1vZGVybiBDUFUuDQo+ID4NCj4gPiBBdCBsZWFzdCB1c2UgInJlcCBt b3ZzbCIuIElmIHRoZSBrZXJuZWwgc3RhY2sgaXNuJ3QgNC1ieXRlIGFsaWduZWQsDQo+ID4geW91 IGhhdmUgaXNzdWVzLg0KDQpUaGUgYWxpZ25tZW50IGRvZXNuJ3QgbWF0dGVyLCAncmVwIG1vdnNs JyB3aWxsIHN0aWxsIHdvcmsuDQoNCj4gSW5kZWVkLCAicmVwIG1vdnMiIGhhcyBzb21lIHNldHVw IG92ZXJoZWFkIHRoYXQgbWFrZXMgaXQgdW5kZXNpcmFibGUNCj4gZm9yIHNtYWxsIHNpemVzLiBJ biBteSB0ZXN0aW5nLCBtb3ZpbmcgbGVzcyB0aGFuIDEyOCBieXRlcyB3aXRoICJyZXAgbW92cyIN Cj4gaXMgYSBsb3NzLg0KDQpJdCB2ZXJ5IG11Y2ggZGVwZW5kcyBvbiB0aGUgY3B1Lg0KDQpSZWNl bnQgKEhhc3dlbGw/KSBJbnRlbCBjcHVzIGhhdmUgaGFyZHdhcmUgc3VwcG9ydCBmb3Igb3B0aW1p c2luZyAncmVwIG1vdnNiJw0KZm9yIGNhY2hlZCBtZW1vcnkgbG9jYXRpb25zIHNvIHRoYXQgaXQg aXMgZmFzdCByZWdhcmRsZXNzIG9mIHRoZSBhbGlnbm1lbnRzLg0KVGhlIHNldHVwIGNvc3QgaXMg ZmFpcmx5IHNtYWxsLg0KDQpUaGUgcHJldmlvdXMgZ2VuZXJhdGlvbiBoYWQgYW4gb3B0aW1pc2F0 aW9uIGZvciAncmVwIG1vdnNiJyBmb3IgbGVzcyB0aGFuDQo3IGJ5dGVzLCBidXQgZm9yIGxhcmdl ciB2YWx1ZXMgdGhlIHNldHVwIGNvc3Qgd2FzIHNpZ25pZmljYW50bHkgaGlnaGVyLg0KT24gdGhl c2UgY3B1IHlvdSBuZWVkZWQgdG8gdXNlICdyZXAgbW92c2QnICg2NCBiaXRzIGlzIGJlc3QpIGZv ciB0aGUgYnVsaw0Kb2YgYSBjb3B5Lg0KDQpBY3R1YWxseSwgaW5zdGVhZCBvZiB1c2luZyAncmVw IG1vdnNiJyB0byBjb3B5IHRoZSBvZGQgZmV3IGJ5dGVzLCBmb3INCm1lbWNweSgpIHlvdSBjYW4g Y29weSB0aGUgbGFzdCAobWlzYWxpZ25lZCkgOCBieXRlcyBmaXJzdCB0aGVuIHVzZQ0KJ3JlcCBt b3ZzZCcgZm9yIHRoZSBidWxrIG9mIHRoZSBjb3B5Lg0KDQpPbiBOZXRidXJzdCBQNCB0aGUgc2V0 dXAgY29zdCBmb3IgYW55ICdyZXAgbW92cycgd2FzIHNvbWV0aGluZyBsaWtlIDQ1IGNsb2Nrcy4N CllvdSByZWFsbHkgZGlkbid0IHdhbnQgdG8gdXNlIHRoZW0gZm9yIHNob3J0IGNvcGllcy4NCihB IEMgY29tcGlsZXIgZnJvbSBhIHdlbGwga25vd24gT1Mgc3VwcGxpZXIgd2lsbCAnb3B0aW1pc2Un IGFueSBjb3B5IGxvb3ANCmludG8gJ3JlcCBtb3ZzYicgLSBub3QgZW50aXJlbHkgdGhlIGJlc3Qg b2Ygb3B0aW1pc2F0aW9ucyEpDQoNCkkgYWxzbyBtYW5hZ2VkIHRvIG1hdGNoIHRoZSBwZXItY3lj bGUgY29zdCBvZiAncmVwIG1vdnNsJyB3aXRoIGEgY29weQ0KbG9vcCBvbiBteSBBdGhsb24tNzAw IChidXQgbm90IHRoZSBzZXR1cCBjb3N0LCBvbiBhIFA0IEkgbWlnaHQgaGF2ZQ0KYmVhdGVuIHRo ZSBzZXR1cCBjb3N0IGFzIHdlbGwpLg0KDQoJRGF2aWQNCg0K