From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932269AbeBSXxP (ORCPT ); Mon, 19 Feb 2018 18:53:15 -0500 Received: from outbound.smtp.vt.edu ([198.82.183.121]:56916 "EHLO omr1.cc.vt.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932245AbeBSXxN (ORCPT ); Mon, 19 Feb 2018 18:53:13 -0500 X-Google-Smtp-Source: AH8x226Z6LZIhk4ktHLsqEMxQdx/EmUW0Y51fU1JH5GXIAHWciEZO4PqbXCLsvI0jN/Y7GmlcmSlxw== From: valdis.kletnieks@vt.edu X-Google-Original-From: Valdis.Kletnieks@vt.edu X-Mailer: exmh version 2.8.0 04/21/2017 with nmh-1.7+dev To: "Van De Ven, Arjan" Cc: Jon Masters , David Woodhouse , Paolo Bonzini , "tglx@linutronix.de" , "x86@kernel.org" , "kvm@vger.kernel.org" , "torvalds@linux-foundation.org" , "linux-kernel@vger.kernel.org" , "Hansen, Dave" , Ingo Molnar Subject: Re: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs In-Reply-To: <0575AF4FD06DD142AD198903C74E1CC87A61923C@ORSMSX103.amr.corp.intel.com> References: <1518449255-2182-1-git-send-email-dwmw@amazon.co.uk> <1518449255-2182-2-git-send-email-dwmw@amazon.co.uk> <7e2e5ad1-49b6-1fdb-4a62-8ad6aefc30a0@redhat.com> <1518509708.12890.33.camel@infradead.org> <27c85759-e662-d281-f8a0-0a80ca8ee18f@redhat.com> <1518517262.12890.43.camel@infradead.org> <1518518198.12890.48.camel@infradead.org> <02bd3fdd-1b73-6cab-fb09-38ba933396bd@redhat.com> <1518775136.7876.13.camel@infradead.org> <75287047-77a0-e0ff-c2e8-61c81641251e@redhat.com> <1518776517.7876.21.camel@infradead.org> <1518783021.7876.34.camel@infradead.org> <4882860e-23c5-75b3-ac02-c700f615156e@jonmasters.org> <0575AF4FD06DD142AD198903C74E1CC87A61923C@ORSMSX103.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1519084385_3347P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Mon, 19 Feb 2018 18:53:05 -0500 Message-ID: <10373.1519084385@turing-police.cc.vt.edu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1519084385_3347P Content-Type: text/plain; charset=us-ascii On Mon, 19 Feb 2018 23:42:24 +0000, "Van De Ven, Arjan" said: > the guest is not the problem; guests obviously will already honor if Enhanced > IBRS is enumerated. The problem is mixed migration pools where the hypervisor > may need to decide to not pass this enumeration through to the guest. For bonus points: What should happen to a VM that is live migrated from one hypervisor to another, and the hypervisors have different IBRS support? --==_Exmh_1519084385_3347P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Comment: Exmh version 2.8.0 04/21/2017 iQEVAwUBWotjYY0DS38y7CIcAQKk7wf7BvI+Z/7zK+ZZpj4lSNIdrdUjyEg7mn0R Vew6NFaLpP/G4ZeJEd70wG/D29GtKWlNKWbgV7nhNusSHxZVddaOx3elXtWHXSW9 2zJveZ5FVzfan/FwGVITg8egtvnyazKBTmrBOEBQFyvgdbSgnLqbKu0kcKet8Yaf GBQVd1DvISfLWtEAA1kPj4EDMz5Nhsspr75o9zSH4lelp+OkYHASUvYHlSMpWEK5 SBachW8j1t/gsoIaZ+7aqNLt5Xe+C3fPcajQtf55l0IV/j6V1+ziCcGMTouNs3en 3sK8MmeWOCYVaf43T7YbWSH7lBnS5oaKVzZwtK+UYs8Kqe4yhc6z6w== =bDvg -----END PGP SIGNATURE----- --==_Exmh_1519084385_3347P--