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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+c5EKJrUo1DG8ZGaUvKsMAgADNk4CAAQNRgIAAANKA Date: Thu, 25 Oct 2018 23:03:31 +0000 Message-ID: <6CD573FD-3B38-45B1-9DC6-B5F0E9087FB4@intel.com> References: <20181023184234.14025-1-chang.seok.bae@intel.com> <20181023184234.14025-5-chang.seok.bae@intel.com> <1EE75BE7-12C6-4BD9-9D31-E9C396D2015B@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.144.152.7] Content-Type: text/plain; charset="utf-8" Content-ID: <31D47EBD5DD6A34F9903BC9DAD28C9F5@intel.com> 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 DQoNCj4gT24gT2N0IDI1LCAyMDE4LCBhdCAxNjowMCwgQW5keSBMdXRvbWlyc2tpIDxsdXRvQGtl cm5lbC5vcmc+IHdyb3RlOg0KPiANCj4gT24gVGh1LCBPY3QgMjUsIDIwMTggYXQgMTI6MzIgQU0g QmFlLCBDaGFuZyBTZW9rDQo+IDxjaGFuZy5zZW9rLmJhZUBpbnRlbC5jb20+IHdyb3RlOg0KPj4g DQo+PiANCj4+PiBPbiBPY3QgMjQsIDIwMTgsIGF0IDEyOjE2LCBBbmR5IEx1dG9taXJza2kgPGx1 dG9Aa2VybmVsLm9yZz4gd3JvdGU6DQo+Pj4gDQo+Pj4gT24gVHVlLCBPY3QgMjMsIDIwMTggYXQg MTE6NDMgQU0gQ2hhbmcgUy4gQmFlIDxjaGFuZy5zZW9rLmJhZUBpbnRlbC5jb20+IHdyb3RlOg0K Pj4+PiB2b2lkIHg4Nl9mc2Jhc2Vfd3JpdGVfY3B1KHVuc2lnbmVkIGxvbmcgZnNiYXNlKQ0KPj4+ PiB7DQo+Pj4+IC0gICAgICAgLyoNCj4+Pj4gLSAgICAgICAgKiBTZXQgdGhlIHNlbGVjdG9yIHRv IDAgYXMgYSBub3Rpb24sIHRoYXQgdGhlIHNlZ21lbnQgYmFzZSBpcw0KPj4+PiAtICAgICAgICAq IG92ZXJ3cml0dGVuLCB3aGljaCB3aWxsIGJlIGNoZWNrZWQgZm9yIHNraXBwaW5nIHRoZSBzZWdt ZW50IGxvYWQNCj4+Pj4gLSAgICAgICAgKiBkdXJpbmcgY29udGV4dCBzd2l0Y2guDQo+Pj4+IC0g ICAgICAgICovDQo+Pj4+IC0gICAgICAgbG9hZHNlZyhGUywgMCk7DQo+Pj4+IC0gICAgICAgd3Jt c3JsKE1TUl9GU19CQVNFLCBmc2Jhc2UpOw0KPj4+PiArICAgICAgIGlmIChzdGF0aWNfY3B1X2hh cyhYODZfRkVBVFVSRV9GU0dTQkFTRSkpIHsNCj4+Pj4gKyAgICAgICAgICAgICAgIHdyZnNiYXNl KGZzYmFzZSk7DQo+Pj4+ICsgICAgICAgfSBlbHNlIHsNCj4+Pj4gKyAgICAgICAgICAgICAgIC8q DQo+Pj4+ICsgICAgICAgICAgICAgICAgKiBTZXQgdGhlIHNlbGVjdG9yIHRvIDAgYXMgYSBub3Rp b24sIHRoYXQgdGhlIHNlZ21lbnQgYmFzZSBpcw0KPj4+PiArICAgICAgICAgICAgICAgICogb3Zl cndyaXR0ZW4sIHdoaWNoIHdpbGwgYmUgY2hlY2tlZCBmb3Igc2tpcHBpbmcgdGhlIHNlZ21lbnQg bG9hZA0KPj4+PiArICAgICAgICAgICAgICAgICogZHVyaW5nIGNvbnRleHQgc3dpdGNoLg0KPj4+ PiArICAgICAgICAgICAgICAgICovDQo+Pj4+ICsgICAgICAgICAgICAgICBsb2Fkc2VnKEZTLCAw KTsNCj4+Pj4gKyAgICAgICAgICAgICAgIHdybXNybChNU1JfRlNfQkFTRSwgZnNiYXNlKTsNCj4+ Pj4gKyAgICAgICB9DQo+Pj4+IH0NCj4+Pj4gDQo+Pj4+IHZvaWQgeDg2X2dzYmFzZV93cml0ZV9j cHVfaW5hY3RpdmUodW5zaWduZWQgbG9uZyBnc2Jhc2UpDQo+Pj4+IHsNCj4+Pj4gLSAgICAgICAv KiBTZXQgdGhlIHNlbGVjdG9yIHRvIDAgZm9yIHRoZSBzYW1lIHJlYXNvbiBhcyAlZnMgYWJvdmUu ICovDQo+Pj4+IC0gICAgICAgbG9hZHNlZyhHUywgMCk7DQo+Pj4+IC0gICAgICAgd3Jtc3JsKE1T Ul9LRVJORUxfR1NfQkFTRSwgZ3NiYXNlKTsNCj4+Pj4gKyAgICAgICBpZiAoc3RhdGljX2NwdV9o YXMoWDg2X0ZFQVRVUkVfRlNHU0JBU0UpKSB7DQo+Pj4+ICsgICAgICAgICAgICAgICB3cl9pbmFj dGl2ZV9nc2Jhc2UoZ3NiYXNlKTsNCj4+Pj4gKyAgICAgICB9IGVsc2Ugew0KPj4+PiArICAgICAg ICAgICAgICAgLyogU2V0IHRoZSBzZWxlY3RvciB0byAwIGZvciB0aGUgc2FtZSByZWFzb24gYXMg JWZzIGFib3ZlLiAqLw0KPj4+PiArICAgICAgICAgICAgICAgbG9hZHNlZyhHUywgMCk7DQo+Pj4+ ICsgICAgICAgICAgICAgICB3cm1zcmwoTVNSX0tFUk5FTF9HU19CQVNFLCBnc2Jhc2UpOw0KPj4+ IA0KPj4+IEkgc3RpbGwgZG9uJ3QgZ2V0IHdoYXQgdGhpcyBjb2RlIGlzIHRyeWluZyB0byBkby4g IFNlZSBvdGhlciBlbWFpbC4gIEkNCj4+PiB0aGluayBpdCB3aWxsIHN0cmFpZ2h0IHVwIGNyYXNo IHRoZSBrZXJuZWwgb24gc29tZSBDUFVzLCBzaW5jZSB3cml0aW5nDQo+Pj4gMCB0byAlJWdzIHdp bGwgemVybyBvdXQgdGhlICphY3RpdmUqIGJhc2Ugb24gc29tZSBDUFVzLg0KPj4+IA0KPj4gDQo+ PiBPbiB0aG9zZSBDUFVzLCBob3cgdGhlIG9sZCBkb19hcmNoX3ByY3RsXzY0KCkgd29ya2VkPw0K Pj4gbG9hZHNlZyhHUywgMCkgZXZlbnR1YWxseSBoaXRzIHRoZSBuYXRpdmVfbG9hZF9nc19pbmRl eCBlbnRyeSwgd2hlcmUgYWN0dWFsDQo+PiBtb3Yg4oCmLCAlZ3MgaXMgd3JhcHBlZCBieSB0d28g U1dBUEdTZXMuIFNvLCBpdCB3b27igJl0IGNhdXNlIHRoZSBzaWRlIGVmZmVjdA0KPj4gb2Ygb3Zl cndyaXRpbmcgdGhlICphY3RpdmUqIGJhc2UsIEkgdGhpbmsuDQo+PiANCj4+PiBJIHRoaW5rIHRo YXQsIGlmIHlvdSByZWFsbHkgd2FudCBzb21lIGZhbmN5IG9wdGltaXphdGlvbiBmb3IgdGhlDQo+ Pj4gbm9uLUZTR1NCQVNFIGNhc2UsIHlvdSBuZWVkIHRvIHB1bGwgdGhhdCBvdXQgaW50byB0aGUg Y2FsbGVycyBvZiB0aGVzZQ0KPj4+IGhlbHBlcnMuDQo+PiANCj4gDQo+IEkgd2FzIHRoaW5raW5n IG9mIGxvYWRzZWdtZW50LCBub3QgbG9hZHNlZy4gIFNvcnJ5IQ0KDQpObyBwcm9ibGVtISAgQXBw cmVjaWF0ZSB5b3VyIHJldmlld3MuDQoNCkNoYW5nDQoNCg==