From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50EA136C for ; Sun, 24 Nov 2024 10:28:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.58.85.151 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732444105; cv=none; b=ge3MRKthI1ANOFTPHPG2ZNDphm6xxmdPEUIGoPmyC6x4whxKczu3Mh7GPOL3m7fKO0+eZ2MaAH9O8pHRfaRlHwGM7vnk5lbiDuFMBoDjdLQCDUk1phvcduxmbJoAPyKASWJ3EmAipXqb8X3sZqIaSnRxKYMM7Uk5SMI6C5R+G0E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732444105; c=relaxed/simple; bh=mIQ0vL1xuwidsUtCzvygmK1JTlA4QgFOpy9NW8WTXb8=; h=From:To:CC:Subject:Date:Message-ID:References:In-Reply-To: MIME-Version:Content-Type; b=nnQo3ggPsA/4dMdWs5d4rf7sviKntKCWJg06tdkgprXoDNiBiCVDygWI/eosjyMev7crmKV9H9AMA9rZshrDLPGKE9uaba+QEaEhYpMRup914p05oDjoz1UXpU94xn8jAfELZm/TE8ygr0VlhrwdzmvnunAmYY64T9OzqU5qcBg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ACULAB.COM; spf=pass smtp.mailfrom=aculab.com; arc=none smtp.client-ip=185.58.85.151 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ACULAB.COM Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aculab.com 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-190-K1YGnoheNaW0D407wCzztg-1; Sun, 24 Nov 2024 10:28:20 +0000 X-MC-Unique: K1YGnoheNaW0D407wCzztg-1 X-Mimecast-MFC-AGG-ID: K1YGnoheNaW0D407wCzztg 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; Sun, 24 Nov 2024 10:28:17 +0000 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Sun, 24 Nov 2024 10:28:17 +0000 From: David Laight To: 'Linus Torvalds' CC: Andrew Cooper , "bp@alien8.de" , Josh Poimboeuf , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Arnd Bergmann , Mikel Rychliski , Thomas Gleixner , Ingo Molnar , Dave Hansen , "H. Peter Anvin" Subject: RE: [PATCH] x86: Allow user accesses to the base of the guard page Thread-Topic: [PATCH] x86: Allow user accesses to the base of the guard page Thread-Index: Ads91tEaZvh8m6sNQhyDMO+nmsu5/wAA3QOAAAboxyAAAu91AAAWZoxg Date: Sun, 24 Nov 2024 10:28:17 +0000 Message-ID: <90e813acc14848b1aa0995578f80ffad@AcuMS.aculab.com> References: <680c14b5af9d43d6bc70d2c1e9321e01@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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 60JGV1M1aN1-yOTIo3WDELfQEiLgNJfyyisc4vo6IKg_1732444099 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMjMgTm92ZW1iZXIgMjAyNCAyMzo0NQ0KPiAN Cj4gT24gU2F0LCAyMyBOb3YgMjAyNCBhdCAxNDozNiwgRGF2aWQgTGFpZ2h0IDxEYXZpZC5MYWln aHRAYWN1bGFiLmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBUaGUgcHJvYmxlbSBpcyB0aGF0IGl0IGlz IHZhbGlkIHRvIHBhc3MgYSBidWZmZXIgdGhhdCBlbmRzIHJpZ2h0DQo+ID4gYXQgdGhlIGVuZCBv ZiB2YWxpZCB1c2VyIG1lbW9yeS4NCj4gDQo+IFRoZXJlJ3MgYSBkaWZmZXJlbmNlIGJldHdlZW4g InZhbGlkIiBhbmQgIndlIGNhcmUiLg0KPiANCj4gVGhpcyBpcyB3YXkgcGFzdCB0aGF0IGNhc2Uu IFRoZSBvbmx5IHBvc3NpYmxlIHJlYXNvbiBmb3IgdGhhdA0KPiB6ZXJvLWJ5dGUgdGhpbmcgYXQg dGhlIGVuZCBvZiB0aGUgYWRkcmVzcyBzcGFjZSBpcyBzb21lYm9keSBhY3RpdmVseQ0KPiBsb29r aW5nIGZvciBzb21lIGVkZ2UgY2FzZSwgbm90IGEgcmVhbCB1c2UuDQoNCk1pa2VsIGdhdmUgdGhl IGV4YWN0IHRlc3QgdGhhdCB3YXMgZmFpbGluZy4NCg0KSSBzaG91bGQgaGF2ZSBiZWVuIG1vcmUg Y2xlYXIgdGhhdCB0aGUgaXNzdWUgaXMgZml4aW5nIHZhbGlkIHRyYW5zZmVycw0KdGhhdCBlbmQg YXQgdGhlIGVuZCBvZiB2YWxpZCBtZW1vcnkgd2l0aG91dCBicmVha2luZyB6ZXJvIGxlbmd0aA0K dHJhbnNmZXJzIGFueXdoZXJlIGVsc2UuDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJl c3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsx IDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=