From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Laight Subject: RE: [PATCH v6] x86: load FPU registers on return to userland Date: Tue, 15 Jan 2019 12:44:53 +0000 Message-ID: <2e396dbcbb1c4cc191b4208626baed07@AcuMS.aculab.com> References: <20190109114744.10936-1-bigeasy@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Cc: "x86@kernel.org" , Andy Lutomirski , Paolo Bonzini , =?utf-8?B?UmFkaW0gS3LEjW3DocWZ?= , "kvm@vger.kernel.org" , "Jason A. Donenfeld" , Rik van Riel , Dave Hansen To: 'Sebastian Andrzej Siewior' , "linux-kernel@vger.kernel.org" Return-path: In-Reply-To: <20190109114744.10936-1-bigeasy@linutronix.de> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org RnJvbTogIFNlYmFzdGlhbiBBbmRyemVqIFNpZXdpb3INCj4gU2VudDogMDkgSmFudWFyeSAyMDE5 IDExOjQ3DQo+DQo+IFRoaXMgaXMgYSByZWZ1cmJpc2hlZCBzZXJpZXMgb3JpZ2luYWxseSBzdGFy dGVkIGJ5IGJ5IFJpayB2YW4gUmllbC4gVGhlDQo+IGdvYWwgaXMgbG9hZCB0aGUgRlBVIHJlZ2lz dGVycyBvbiByZXR1cm4gdG8gdXNlcmxhbmQgYW5kIG5vdCBvbiBldmVyeQ0KPiBjb250ZXh0IHN3 aXRjaC4gQnkgdGhpcyBvcHRpbWlzYXRpb24gd2UgY2FuOg0KPiAtIGF2b2lkIGxvYWRpbmcgdGhl IHJlZ2lzdGVycyBpZiB0aGUgdGFzayBzdGF5cyBpbiBrZXJuZWwgYW5kIGRvZXMNCj4gICBub3Qg cmV0dXJuIHRvIHVzZXJsYW5kDQo+IC0gbWFrZSBrZXJuZWxfZnB1X2JlZ2luKCkgY2hlYXBlcjog aXQgb25seSBzYXZlcyB0aGUgcmVnaXN0ZXJzIG9uIHRoZQ0KPiAgIGZpcnN0IGludm9jYXRpb24u IFRoZSBzZWNvbmQgaW52b2NhdGlvbiBkb2VzIG5vdCBuZWVkIHNhdmUgdGhlbSBhZ2Fpbi4NCj4g DQo+IFRvIGFjY2VzcyB0aGUgRlBVIHJlZ2lzdGVycyBpbiBrZXJuZWwgd2UgbmVlZDoNCj4gLSBk aXNhYmxlIHByZWVtcHRpb24gdG8gYXZvaWQgdGhhdCB0aGUgc2NoZWR1bGVyIHN3aXRjaGVzIHRh c2tzLiBCeQ0KPiAgIGRvaW5nIHNvIGl0IHdvdWxkIHNldCBUSUZfTkVFRF9GUFVfTE9BRCBhbmQg dGhlIEZQVSByZWdpc3RlcnMgd291bGQgYmUNCj4gICBub3QgdmFsaWQuDQo+IC0gZGlzYWJsZSBC SCBiZWNhdXNlIHRoZSBzb2Z0aXJxIG1pZ2h0IHVzZSBrZXJuZWxfZnB1X2JlZ2luKCkgYW5kIHRo ZW4NCj4gICBzZXQgVElGX05FRURfRlBVX0xPQUQgaW5zdGVhZCBsb2FkaW5nIHRoZSBGUFUgcmVn aXN0ZXJzIG9uIGNvbXBsZXRpb24uDQoNCk9uY2UgdGhpcyBpcyBkb25lIGl0IG1pZ2h0IGJlIHdv cnRoIHdoaWxlIGFkZGluZyBhIHBhcmFtZXRlciB0bw0Ka2VybmVsX2ZwdV9iZWdpbigpIHRvIHJl cXVlc3QgdGhlIHJlZ2lzdGVycyBvbmx5IHdoZW4gdGhleSBkb24ndA0KbmVlZCBzYXZpbmcuDQpU aGlzIHdvdWxkIGJlbmVmaXQgY29kZSBwYXRocyB3aGVyZSB0aGUgZ2FpbnMgYXJlIHJlYXNvbmFi bGUgYnV0IG5vdCBtYXNzaXZlLg0KDQpUaGUgcmV0dXJuIHZhbHVlIGZyb20ga2VybmVsX2ZwdV9i ZWdpbigpIG91Z2h0IHRvIGluZGljYXRlIHdoaWNoDQpyZWdpc3RlcnMgYXJlIGF2YWlsYWJsZSAt IG5vbmUsIFNTRSwgU1NFMiwgQVZYLCBBVlg1MTIgZXRjLg0KU28gY29kZSBjYW4gdXNlIGFuIGFw cHJvcHJpYXRlIGltcGxlbWVudGF0aW9uLg0KKEkndmUgbm90IGxvb2tlZCB0byBzZWUgaWYgdGhp cyBpcyBhbHJlYWR5IHRoZSBjYXNlISkNCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVz cyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEg MVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==