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Peter Anvin" , Andi Kleen , Dave Hansen , "Metzger, Markus T" , "Shankar, Ravi V" , LKML Subject: Re: [v3 04/12] x86/fsgsbase/64: Enable FSGSBASE instructions in the helper functions Thread-Topic: [v3 04/12] x86/fsgsbase/64: Enable FSGSBASE instructions in the helper functions Thread-Index: AQHUawBO9chRqp+c5EKJrUo1DG8ZGaUvKsMAgADNk4A= Date: Thu, 25 Oct 2018 07:32:27 +0000 Message-ID: <1EE75BE7-12C6-4BD9-9D31-E9C396D2015B@intel.com> References: <20181023184234.14025-1-chang.seok.bae@intel.com> <20181023184234.14025-5-chang.seok.bae@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.255.78.140] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org DQo+IE9uIE9jdCAyNCwgMjAxOCwgYXQgMTI6MTYsIEFuZHkgTHV0b21pcnNraSA8bHV0b0BrZXJu ZWwub3JnPiB3cm90ZToNCj4gDQo+IE9uIFR1ZSwgT2N0IDIzLCAyMDE4IGF0IDExOjQzIEFNIENo YW5nIFMuIEJhZSA8Y2hhbmcuc2Vvay5iYWVAaW50ZWwuY29tPiB3cm90ZToNCj4+IHZvaWQgeDg2 X2ZzYmFzZV93cml0ZV9jcHUodW5zaWduZWQgbG9uZyBmc2Jhc2UpDQo+PiB7DQo+PiAtICAgICAg IC8qDQo+PiAtICAgICAgICAqIFNldCB0aGUgc2VsZWN0b3IgdG8gMCBhcyBhIG5vdGlvbiwgdGhh dCB0aGUgc2VnbWVudCBiYXNlIGlzDQo+PiAtICAgICAgICAqIG92ZXJ3cml0dGVuLCB3aGljaCB3 aWxsIGJlIGNoZWNrZWQgZm9yIHNraXBwaW5nIHRoZSBzZWdtZW50IGxvYWQNCj4+IC0gICAgICAg ICogZHVyaW5nIGNvbnRleHQgc3dpdGNoLg0KPj4gLSAgICAgICAgKi8NCj4+IC0gICAgICAgbG9h ZHNlZyhGUywgMCk7DQo+PiAtICAgICAgIHdybXNybChNU1JfRlNfQkFTRSwgZnNiYXNlKTsNCj4+ ICsgICAgICAgaWYgKHN0YXRpY19jcHVfaGFzKFg4Nl9GRUFUVVJFX0ZTR1NCQVNFKSkgew0KPj4g KyAgICAgICAgICAgICAgIHdyZnNiYXNlKGZzYmFzZSk7DQo+PiArICAgICAgIH0gZWxzZSB7DQo+ PiArICAgICAgICAgICAgICAgLyoNCj4+ICsgICAgICAgICAgICAgICAgKiBTZXQgdGhlIHNlbGVj dG9yIHRvIDAgYXMgYSBub3Rpb24sIHRoYXQgdGhlIHNlZ21lbnQgYmFzZSBpcw0KPj4gKyAgICAg ICAgICAgICAgICAqIG92ZXJ3cml0dGVuLCB3aGljaCB3aWxsIGJlIGNoZWNrZWQgZm9yIHNraXBw aW5nIHRoZSBzZWdtZW50IGxvYWQNCj4+ICsgICAgICAgICAgICAgICAgKiBkdXJpbmcgY29udGV4 dCBzd2l0Y2guDQo+PiArICAgICAgICAgICAgICAgICovDQo+PiArICAgICAgICAgICAgICAgbG9h ZHNlZyhGUywgMCk7DQo+PiArICAgICAgICAgICAgICAgd3Jtc3JsKE1TUl9GU19CQVNFLCBmc2Jh c2UpOw0KPj4gKyAgICAgICB9DQo+PiB9DQo+PiANCj4+IHZvaWQgeDg2X2dzYmFzZV93cml0ZV9j cHVfaW5hY3RpdmUodW5zaWduZWQgbG9uZyBnc2Jhc2UpDQo+PiB7DQo+PiAtICAgICAgIC8qIFNl dCB0aGUgc2VsZWN0b3IgdG8gMCBmb3IgdGhlIHNhbWUgcmVhc29uIGFzICVmcyBhYm92ZS4gKi8N Cj4+IC0gICAgICAgbG9hZHNlZyhHUywgMCk7DQo+PiAtICAgICAgIHdybXNybChNU1JfS0VSTkVM X0dTX0JBU0UsIGdzYmFzZSk7DQo+PiArICAgICAgIGlmIChzdGF0aWNfY3B1X2hhcyhYODZfRkVB VFVSRV9GU0dTQkFTRSkpIHsNCj4+ICsgICAgICAgICAgICAgICB3cl9pbmFjdGl2ZV9nc2Jhc2Uo Z3NiYXNlKTsNCj4+ICsgICAgICAgfSBlbHNlIHsNCj4+ICsgICAgICAgICAgICAgICAvKiBTZXQg dGhlIHNlbGVjdG9yIHRvIDAgZm9yIHRoZSBzYW1lIHJlYXNvbiBhcyAlZnMgYWJvdmUuICovDQo+ PiArICAgICAgICAgICAgICAgbG9hZHNlZyhHUywgMCk7DQo+PiArICAgICAgICAgICAgICAgd3Jt c3JsKE1TUl9LRVJORUxfR1NfQkFTRSwgZ3NiYXNlKTsNCj4gDQo+IEkgc3RpbGwgZG9uJ3QgZ2V0 IHdoYXQgdGhpcyBjb2RlIGlzIHRyeWluZyB0byBkby4gIFNlZSBvdGhlciBlbWFpbC4gIEkNCj4g dGhpbmsgaXQgd2lsbCBzdHJhaWdodCB1cCBjcmFzaCB0aGUga2VybmVsIG9uIHNvbWUgQ1BVcywg c2luY2Ugd3JpdGluZw0KPiAwIHRvICUlZ3Mgd2lsbCB6ZXJvIG91dCB0aGUgKmFjdGl2ZSogYmFz ZSBvbiBzb21lIENQVXMuDQo+IA0KDQpPbiB0aG9zZSBDUFVzLCBob3cgdGhlIG9sZCBkb19hcmNo X3ByY3RsXzY0KCkgd29ya2VkPw0KbG9hZHNlZyhHUywgMCkgZXZlbnR1YWxseSBoaXRzIHRoZSBu YXRpdmVfbG9hZF9nc19pbmRleCBlbnRyeSwgd2hlcmUgYWN0dWFsDQptb3Yg4oCmLCAlZ3MgaXMg d3JhcHBlZCBieSB0d28gU1dBUEdTZXMuIFNvLCBpdCB3b27igJl0IGNhdXNlIHRoZSBzaWRlIGVm ZmVjdA0Kb2Ygb3ZlcndyaXRpbmcgdGhlICphY3RpdmUqIGJhc2UsIEkgdGhpbmsuDQoNCj4gSSB0 aGluayB0aGF0LCBpZiB5b3UgcmVhbGx5IHdhbnQgc29tZSBmYW5jeSBvcHRpbWl6YXRpb24gZm9y IHRoZQ0KPiBub24tRlNHU0JBU0UgY2FzZSwgeW91IG5lZWQgdG8gcHVsbCB0aGF0IG91dCBpbnRv IHRoZSBjYWxsZXJzIG9mIHRoZXNlDQo+IGhlbHBlcnMuDQoNCg==