From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Laight Subject: RE: [PATCH v9 00/27] x86: load FPU registers on return to userland Date: Thu, 4 Apr 2019 15:10:49 +0000 Message-ID: References: <20190403164156.19645-1-bigeasy@linutronix.de> <20190404141409.upfk5z4re3pyvxzn@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Cc: "linux-kernel@vger.kernel.org" , "x86@kernel.org" , Paolo Bonzini , =?utf-8?B?UmFkaW0gS3LEjW3DocWZ?= , "kvm@vger.kernel.org" , "Jason A. Donenfeld" , Rik van Riel , Dave Hansen To: 'Andy Lutomirski' , Sebastian Andrzej Siewior Return-path: In-Reply-To: Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org RnJvbTogU2ViYXN0aWFuIEFuZHJ6ZWogU2lld2lvcg0KPiBGcm9tOiBBbmR5IEx1dG9taXJza2kg W21haWx0bzpsdXRvQGtlcm5lbC5vcmddDQo+IFNlbnQ6IDA0IEFwcmlsIDIwMTkgMTU6MjcNCj4g DQo+IE9uIFRodSwgQXByIDQsIDIwMTkgYXQgNzoxNCBBTSBTZWJhc3RpYW4gQW5kcnplaiBTaWV3 aW9yDQo+IDxiaWdlYXN5QGxpbnV0cm9uaXguZGU+IHdyb3RlOg0KPiA+DQo+ID4gT24gMjAxOS0w NC0wNCAxNDowMTo0MyBbKzAwMDBdLCBEYXZpZCBMYWlnaHQgd3JvdGU6DQo+ID4gPiBGcm9tOiBT ZWJhc3RpYW4gQW5kcnplaiBTaWV3aW9yDQo+ID4gPiA+IFNlbnQ6IDAzIEFwcmlsIDIwMTkgMTc6 NDENCj4gPiA+IC4uLg0KPiA+ID4gPiBUbyBhY2Nlc3MgdGhlIEZQVSByZWdpc3RlcnMgaW4ga2Vy bmVsIHdlIG5lZWQ6DQo+ID4gPiA+IC0gZGlzYWJsZSBwcmVlbXB0aW9uIHRvIGF2b2lkIHRoYXQg dGhlIHNjaGVkdWxlciBzd2l0Y2hlcyB0YXNrcy4gQnkNCj4gPiA+ID4gICBkb2luZyBzbyBpdCB3 b3VsZCBzZXQgVElGX05FRURfRlBVX0xPQUQgYW5kIHRoZSBGUFUgcmVnaXN0ZXJzIHdvdWxkIGJl DQo+ID4gPiA+ICAgbm90IHZhbGlkLg0KPiA+ID4gPiAtIGRpc2FibGUgQkggYmVjYXVzZSB0aGUg c29mdGlycSBtaWdodCB1c2Uga2VybmVsX2ZwdV9iZWdpbigpIGFuZCB0aGVuDQo+ID4gPiA+ICAg c2V0IFRJRl9ORUVEX0ZQVV9MT0FEIGluc3RlYWQgbG9hZGluZyB0aGUgRlBVIHJlZ2lzdGVycyBv biBjb21wbGV0aW9uLg0KPiA+ID4NCj4gPiA+IElzIHRoZXJlIGEgcG9zc2libGUgb3B0aW1pc2F0 aW9uIGhlcmUgZm9yIGtlcm5lbCB0aHJlYWRzPw0KPiA+ID4gU2luY2UgdGhlcmUgaXMgbm8gJ3Vz ZXIgRlAgc3RhdGUnIHRoZSAna2VybmVsIEZQIHN0YXRlJyBjYW4NCj4gPiA+IGJlIHNhdmVkIGJ5 IGEgdGFzayBzd2l0Y2ggb3Igc29mdGlycS4NCj4gPg0KPiA+IFRoZXJlIGlzIG5vIHN1Y2ggdGhp bmcgYXMgImtlcm5lbCBGUCBzdGF0ZSIgdGhhdCBpcyBzYXZlZC4NCj4gPg0KPiANCj4gSSB0aGlu ayB0aGF0IERhdmlkIHdhcyBhc2tpbmcgd2hldGhlciB3ZSBjb3VsZCBtYWtlIGtlcm5lbF9mcHVf YmVnaW4oKQ0KPiByZWdpb25zIHNvbWV0aW1lcyBiZSBwcmVlbXB0aWJsZS4gIFRoZSBhbnN3ZXIg aXMgcHJlc3VtYWJseSB5ZXMsIGJ1dCBJDQo+IHRoaW5rIHRoYXQgc2hvdWxkIGJlIGEgc2VwYXJh dGUgZWZmb3J0LCBhbmQgaXQgc2hvdWxkIGJlIGp1c3RpZmllZA0KPiB3aXRoIGltcHJvdmVkIHBl cmZvcm1hbmNlIGFib3ZlIGFuZCBiZXlvbmQgd2hhdCB3ZSBnZXQgd2l0aCBKYXNvbidzDQo+IHNp bWRfZ2V0KCkgc3R1ZmYuDQoNClllcC4uLg0KDQotIEFjdHVhbGx5IHRoZXJlIGFyZSBzb21lIGxv b3BzIHRoYXQgcHJvY2VzcyBtb3JlIG9yIGxlc3MgYXJiaXRyYXJ5DQotIGFtb3VudHMgb2YgZGF0 YS4gQnV0IGFsbCBvZiB0aG9zZSBzb21ld2hhdCBtYW51YWxseSBicmVhayB0aGF0IHVwDQotIGlu dG8gcGFnZSBzaXplIGNodW5rcyBiZWZvcmUgY2hlY2tpbmcgaWYgd2UndmUgZGlzYWJsZWQgcHJl ZW1wdGlvbg0KLSBmb3IgdG9vIGxvbmcsIGFuZCB0aGVuIGlmIHNvLCBkbyBhIGVuZCgpYmVnaW4o KSBzZXF1ZW5jZSBiZWZvcmUNCi0gc3RhcnRpbmcgdGhlIG5leHQgY2h1bmsuIE15IHNpbWRfcmVs YXggdGFrZXMgY2FyZSBvZiB0aGF0LCBmb3INCi0gZXhhbXBsZS4gR2l2ZW4gdGhhdCBhIGxvbmcg dGVybSBwdXJwb3NlIG9mIHRoaXMgcGF0Y2hzZXQgaXMgdG8NCi0gb2Jzb2xldGUgdGhlIHNpbWRf Z2V0L3B1dC9yZWxheCBBUEkgSSd2ZSBwcm9wb3NlZCwgaXQgc2VlbXMgbGlrZQ0KLSBpdCBtaWdo dCBiZSBuaWNlIHRvIGFsc28gZG8gYXdheSB3aXRoIHRoZSBtYW51YWwgcmVsYXhhdGlvbg0KLSBy ZXF1aXJlbWVudCwgaWYgdGhhdCdzIHNvbWVob3cgcG9zc2libGUuDQoNClRoZSBhZHZhbnRhZ2Ug b2YgYSAncmVsYXgnIChvciBrZXJuZWxfZnB1X2VuZCgpL2JlZ2luKCkgcGFpcikNCmlzIHRoYXQg dGhlIGtlcm5lbCByZWdpc3RlcnMgbmV2ZXIgbmVlZCBzYXZpbmcuDQpPVE9IIGFsbG93aW5nIGFy Yml0cmFyeSBjb250ZXh0IHN3aXRjaGVzIGlzIChwcm9iYWJseSkgYmV0dGVyDQpmb3IgbGF0ZW5j eS4gDQoNCkFzIHdlbGwgYXMga2VybmVsIHRocmVhZHMgYmVpbmcgYWJsZSB0byB1c2UgdGhlIHRh c2tzICdub3JtYWwnIGZwdQ0Kc2F2ZSBhcmVhLCBpdCBvdWdodCB0byBiZSBwb3NzaWJsZSB0byBw YXNzIGFuICdmcHUgc2F2ZSBhcmVhJw0KdG8ga2VybmVsX2ZwdV9iZWdpbigpIHNvIHRoYXQgYSBu b24ta2VybmVsIHRocmVhZCBjYW4gYmUgcHJlLWVtcHRlZA0Kd2hpbGUgdXNpbmcgdGhlIGZwdS4N Cg0KQWN0dWFsbHkgeW91IGNvdWxkIChwcm9iYWJseSkganVzdCBwYXNzIHRoZSBhZGRyZXNzIG9m IGEgbG9jYXRpb24NCndoZXJlIHRoZSBhZGRyZXNzIG9mIGEga21hbGxvYygpZWQgc2F2ZSBhcmVh IHdvdWxkIGJlIHdyaXR0ZW4NCndlcmUgb25lIG5lZWRlZCBhbmQgYWxsb2NhdGUgdGhlIHN0cnVj dHVyZSB0aGUgZmlyc3QgdGltZSBpdA0KaXMgbmVlZGVkIChhbHRob3VnaCBrbWFsbG9jKCkgaW4g dGhhdCBjb2RlIHBhdGggbWlnaHQgYmUgaGFyZC4pDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVk IEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5l cywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=