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Peter Anvin" , Andi Kleen , "Shankar, Ravi V" , LKML , "Hansen, Dave" Subject: Re: [REGRESSION] x86/cpu fsgsbase breaks TLS in 32 bit rr tracees on a 64 bit system Thread-Topic: [REGRESSION] x86/cpu fsgsbase breaks TLS in 32 bit rr tracees on a 64 bit system Thread-Index: AQHWd3V5K8M4bUeg6Em80I1SKO69L6lC/t2AgAAXcYCAAAPmAA== Date: Fri, 21 Aug 2020 21:46:46 +0000 Message-ID: <6758DBF1-D707-45B3-BA10-3621674DEBF8@intel.com> References: <29FD0DDA-3093-46A3-BCF4-85DEC229E30D@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3608.120.23.2.1) authentication-results: kylehuey.com; dkim=none (message not signed) header.d=none;kylehuey.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [73.189.248.82] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 421d940e-2e59-4a51-6531-08d8461bb3a7 x-ms-traffictypediagnostic: BY5PR11MB4338: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6430; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: YYeFUq3xsLhlrlm4WmNnN+dhGUfvBtFRdiGMIuKa++ogXYdUG3JiGZYQ6q0vZvY11RxgpvkmkPJtRHyCFkktySC2XsQv/9Zojz4EZAnsAkb6S7pX9jFS75XW2UIJYTP8H9fnbuor8fyVft2pG77fq29L9qTAI62CSlw02GTqkKUz5mwO8TmNaz0zRNEbJ0iac7WNe78YkARRNYCo3oVwsVFZVzMTY6krhB9xlVu8qX/4I8xchfUufhH76YOzvgxd12IAERWCLDUvWdVlqEgILG3myL3cviiKbq1HhxqzP6iLiopB5n5rMbhK7RQd22UhgZ9Sdc5PXNpHvQlWtJy1kw== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BY5PR11MB4056.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(136003)(346002)(376002)(39860400002)(396003)(366004)(71200400001)(8936002)(36756003)(8676002)(54906003)(6916009)(478600001)(33656002)(4326008)(86362001)(4744005)(53546011)(6506007)(5660300002)(66446008)(186003)(76116006)(2616005)(26005)(6486002)(6512007)(316002)(64756008)(66946007)(2906002)(66556008)(66476007);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY5PR11MB4056.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 421d940e-2e59-4a51-6531-08d8461bb3a7 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Aug 2020 21:46:46.4169 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: yoe1/5eaNNSwr35SqwHlrxQLQCULrSuSJbcTx3UA4z3WV9H+O/yGph0/rDl/YIH4yzxN9dlQ9HwPdMtyz5cXtixetRLpbo8YVhSgPrX2tqU= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR11MB4338 X-OriginatorOrg: intel.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Aug 21, 2020, at 14:32, Kyle Huey wrote: >=20 > 40c45904f818c1f6555294ca27afc5fda4f09e68 added magic for a 32 bit > tracer tracing a 32 bit tracee on a 64 bit kernel, but it looks like a > 64 bit tracer tracing a 32 bit tracee on a 64 bit kernel *is* now > expected to preserve the fs/gsbase values (or die, in our case). >=20 > Is that correct? Correct. Thanks, Chang