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Wed, 18 Nov 2020 13:22:29 +0000 X-MC-Unique: eBeRGmPRPnygMD5X2l45bA-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 18 Nov 2020 13:22:28 +0000 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Wed, 18 Nov 2020 13:22:28 +0000 From: David Laight To: 'Alexandre Chartre' , Borislav Petkov CC: "tglx@linutronix.de" , "mingo@redhat.com" , "hpa@zytor.com" , "x86@kernel.org" , "dave.hansen@linux.intel.com" , "luto@kernel.org" , "peterz@infradead.org" , "linux-kernel@vger.kernel.org" , "thomas.lendacky@amd.com" , "jroedel@suse.de" , "konrad.wilk@oracle.com" , "jan.setjeeilers@oracle.com" , "junaids@google.com" , "oweisse@google.com" , "rppt@linux.vnet.ibm.com" , "graf@amazon.de" , "mgross@linux.intel.com" , "kuzuno@gmail.com" Subject: RE: [RFC][PATCH v2 00/21] x86/pti: Defer CR3 switch to C code Thread-Topic: [RFC][PATCH v2 00/21] x86/pti: Defer CR3 switch to C code Thread-Index: AQHWvX4bZBmKPgi/bUuugBhHF1Bzu6nNnuFAgAARogCAACju4A== Date: Wed, 18 Nov 2020 13:22:28 +0000 Message-ID: <5c93e47e106c42659b2004e8de604d61@AcuMS.aculab.com> References: <20201116144757.1920077-1-alexandre.chartre@oracle.com> <20201116201711.GE1131@zn.tnic> <44a88648-738a-4a4b-9c25-6b70000e037c@oracle.com> <20201117165539.GG5719@zn.tnic> <890f6b7e-a268-2257-edcb-5eacc7db3d8e@oracle.com> <20201117212608.GS5719@zn.tnic> <0bedae59-5397-9cae-3c2a-66bc376f5616@oracle.com> In-Reply-To: <0bedae59-5397-9cae-3c2a-66bc376f5616@oracle.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogQWxleGFuZHJlIENoYXJ0cmUNCj4gU2VudDogMTggTm92ZW1iZXIgMjAyMCAxMDozMA0K Li4uDQo+IENvcnJlY3QsIHRoaXMgUkZDIGlzIG5vdCBjaGFuZ2luZyB0aGUgb3ZlcmhlYWQuIEhv d2V2ZXIsIGl0IGlzIGEgc3RlcCBmb3J3YXJkDQo+IGZvciBiZWluZyBhYmxlIHRvIGV4ZWN1dGUg c29tZSBzZWxlY3RlZCBzeXNjYWxscyBvciBpbnRlcnJ1cHQgaGFuZGxlcnMgd2l0aG91dA0KPiBz d2l0Y2hpbmcgdG8gdGhlIGtlcm5lbCBwYWdlLXRhYmxlLiBUaGUgbmV4dCBzdGVwIHdvdWxkIGJl IHRvIGlkZW50aWZ5IGFuZCBhZGQNCj4gdGhlIG5lY2Vzc2FyeSBtYXBwaW5nIHRvIHRoZSB1c2Vy IHBhZ2UtdGFibGUgc28gdGhhdCBzcGVjaWZpZWQgc3lzY2FsbHMgY2FuIGJlDQo+IGV4ZWN1dGVk IHdpdGhvdXQgc3dpdGNoaW5nIHRoZSBwYWdlLXRhYmxlLg0KDQpSZW1lbWJlciB0aGF0IHdpdGhv dXQgUFRJIHVzZXIgc3BhY2UgY2FuIHJlYWQgYWxsIGtlcm5lbCBtZW1vcnkuDQooSSdtIG5vdCAx MDAlIHN1cmUgeW91IGNhbiBmb3JjZSBhIGNhY2hlLWxpbmUgcmVhZC4pDQpJdCBpc24ndCBldmVu IHRoYXQgc2xvdy4NCihFdmVuIEkgY2FuIHVuZGVyc3RhbmQgaG93IGl0IHdvcmtzLikNCg0KU28g aWYgeW91IGFyZSB3b3JyaWVkIGFib3V0IHVzZXIgc3BhY2UgZG9pbmcgdGhhdCB5b3UgY2FuJ3Qg cmVhbGx5DQpydW4gYW55dGhpbmcgb24gdGhlIHVzZXIgcGFnZSB0YWJsZXMuDQoNClN5c3RlbSBj YWxscyBsaWtlIGdldHBpZCgpIGFyZSBpcnJlbGV2YW50IC0gdGhleSBhcmVuJ3QgdXNlZCAobXVj aCkuDQpFdmVuIHRoZSB0aW1lIG9mIGRheSBvbmVzIGFyZSBpbXBsZW1lbnRlZCBpbiB0aGUgVkRT TyB3aXRob3V0IGENCmNvbnRleHQgc3dpdGNoLg0KDQpTbyB0aGUgb3ZlcmhlYWRzIGNvbWUgZnJv bSBvdGhlciBzeXN0ZW0gY2FsbHMgdGhhdCAnZG8gd29yaycNCndpdGhvdXQgYWN0dWFsbHkgc2xl ZXBpbmcuDQpJJ20gZ3Vlc3NpbmcgdGhpbmdzIGxpa2UgcmVhZCwgd3JpdGUsIHNlbmRtc2csIHJl Y3Ztc2cuDQoNClRoZSBvbmx5IGludGVyZXN0aW5nIHN5c3RlbSBjYWxsIEkgY2FuIHRoaW5rIG9m IGlzIGZ1dGV4Lg0KQXMgd2VsbCBhcyBhbGwgdGhlIGNhbGxzIHRoYXQgcmV0dXJuIGltbWVkaWF0 ZWx5IGJlY2F1c2UgdGhlDQptdXRleCBoYXMgYmVlbiByZWxlYXNlZCB3aGlsZSBlbnRlcmluZyB0 aGUga2VybmVsLCBJIHN1c3BlY3QNCnRoYXQgYmVpbmcgcHJlLWVtcHRlZCBieSBhIGRpZmZlcmVu dCB0aHJlYWQgKG9mIHRoZSBzYW1lIHByb2Nlc3MpDQpkb2Vzbid0IGFjdHVhbGx5IG5lZWQgQ1Iz IHJlbG9hZGluZyAod2l0aG91dCBQVEkpLg0KDQpJIGFsc28gc3VzcGVjdCB0aGF0IGl0IGlzbid0 IGp1c3QgdGhlIENSMyByZWxvYWQgdGhhdCBjb3N0cy4NClRoZXJlIGNvdWxkIChkZXBlbmRpbmcg b24gdGhlIGNwdSkgYmUgYXNzb2NpYXRlZCBUTEIgYW5kL29yIGNhY2hlDQppbnZhbGlkYXRpb25z IHRoYXQgaGF2ZSBhIG11Y2ggbGFyZ2VyIGVmZmVjdCBvbiBwcm9ncmFtcyB3aXRoDQpsYXJnZSB3 b3JraW5nIHNldHMgdGhhbiBvbiBzaW1wbGUgYmVuY2htYXJrIHByb2dyYW1zLg0KDQpOb3cgYml0 cyBvZiBkYXRhIHRoYXQgeW91IGFyZSAnbW9yZSB3b3JyaWVkIGFib3V0JyBjb3VsZCBiZSBrZXB0 DQppbiBwaHlzaWNhbCBtZW1vcnkgdGhhdCBpc24ndCBub3JtYWxseSBtYXBwZWQgKG9yIHJlZmVy ZW5jZWQgYnkNCmEgVExCKSBhbmQgb25seSBtYXBwZWQgd2hlbiBuZWVkZWQuDQpCdXQgdGhhdCBk b2Vzbid0IGhlbHAgdGhlIGdlbmVyYWwgY2FzZS4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQg QWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVz LCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==