From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.codeaurora.org by pdx-caf-mail.web.codeaurora.org (Dovecot) with LMTP id dnBbBZHRG1uBcwAAmS7hNA ; Sat, 09 Jun 2018 13:10:12 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 7759E607BB; Sat, 9 Jun 2018 13:10:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by smtp.codeaurora.org (Postfix) with ESMTP id 0393D606FA; Sat, 9 Jun 2018 13:10:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0393D606FA Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=jonmasters.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753263AbeFINKK (ORCPT + 25 others); Sat, 9 Jun 2018 09:10:10 -0400 Received: from edison.jonmasters.org ([173.255.233.168]:36558 "EHLO edison.jonmasters.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753159AbeFINKI (ORCPT ); Sat, 9 Jun 2018 09:10:08 -0400 Received: from [104.153.224.165] (helo=washington.bos.jonmasters.org) by edison.jonmasters.org with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fRdd0-0001kQ-MB; Sat, 09 Jun 2018 13:09:59 +0000 To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Will Deacon , Catalin Marinas , Thomas Gleixner , Andy Lutomirski , Kees Cook , Greg Kroah-Hartman , Christoffer Dall , Randy Dunlap , Dominik Brodowski , Julien Grall , Mark Rutland References: <20180529121121.24927-1-marc.zyngier@arm.com> <20180529121121.24927-13-marc.zyngier@arm.com> From: Jon Masters Openpgp: preference=signencrypt Autocrypt: addr=jcm@jonmasters.org; prefer-encrypt=mutual; keydata= xsFNBE6Ll1oBEADNCMsChhQGT2JDjJPzACWwz2LgW9Scrzg7fMuB0QCZUWwYiFn8aSnWbF1D gW8zLaylIUBcoSZNNPQ3S03pHmFtCwCPESaCI/TikHlGA6c996jZzf1zLx/khEecBC1b4pFM VbWzE0RosgXotxu0MCaAp3mLOFWRZJu4BHGuSSuqbT4qfJ1euIN4uSD7+GG5M/O3ERIoYV3Q E8FBUUKKDRXdI8e1fq7iqg59Dq4P922iuhpbdwQRTRQmb+4uuRaJG7PMP5uBtN+Y0umvYK/y ha1kFqunGQ95GTSleD3E5ifjXWAOLjOldl4fxw6a5Z2fbX+uTancr8G85JLzhQp4+0Av5WfV MGe+UCUH8nlfJDzFE0q/oltgXDwE+4Pr9J8NSN4heF8XL5Cn6JnE9d/YvgIGEmyf6J/8WPQ+ nWTqN+VvEkrvn5oHuJOuM16AFRptUFQOJQGCIK/hupwHkR6TjFMA2XLv6CXjAgvWK+z9SAw8 zUFcqDN983qD3pc88lmSgPp7uArmMwBdCEpVayCLvu+M5kzZz9rty73u3Rv1MF0o+Rtdq4uc JLhjCd/FAMTXi5VzkBcuOufgcvqs0kFgloCvdL72+dyowYDJaC8Ir6KNrz3iOk9P56ESY8E3 70/wkoyfVnesrih7ntiqltISotRR7lDp4AD8oskaAcGqKy3AYQARAQABzTdKb24gTWFzdGVy cyAoSm9uYXRoYW4gQ2hhcmxlcyBNYXN0ZXJzKSA8amNtQGtlcm5lbC5vcmc+wsF4BBMBAgAi BQJOi5geAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRDkIJuMiuip0bOWD/9ca9kj mgdy2FFPlb0Cy6gqA0fAKXix27sX56K9FD3HwWgJUC9QpdvqYXxVu1ASK85+FvJKvSs9BdOY uBTtVl29kpVkAkPP+7RIpBQ89Ewhu8wCNFt0ZIcV/c9IivpFDjqSp/eAxrbB9k3IMUYBlDeB vPFnkqI5cxm5Lnl3sJIAI6lby9OJBoVqj38q85JInE2SS2RVM92JvDZFEB3oVryObenG5Fb4 Ugb0DcSC2gKocoa41iBhl3ggz3TjBg9oxSTIFEsRg+AhV0AUWdYCQtQGqng1V1HU38vAACx8 b/NoFnoyjqBA0agECHeC8bpFQHEienP+Hs8K4EhMa79h+EZRqjwzjMvceG85Gsz6yIqcq/3+ TfORU64RZUWzJh/oy0sRbgl5Fj89JIfdqz0YDdYlbNbWhRfV/KOZNdXZWYpqQNcmxPGuHs+Z VkLD84TE5+puOEihNifFFNch0lJSOGwnxged4JJAfJaeZtVp8s+WqCH7rqeCBgetBn32fG/A Tx+EcVi9KAmcrV7opi9uP1ZTQRuRoc95Zia/C9CQFCacnHcQ5JyWf4k6IbDVuGDKqXfAoTmp Jlj0BwarWY9OFtgKpVyFbD0cUz5m/f1G750SjGud/PCmcYGjuDIQdaoE10ZrHjolqbWnWkJl XioO+VRdOFxe9vetIOmPIrNnh6M7fc7BTQROi5daARAAuB7uqbo8oWZlkniNFb/AkTruoUp6 ak+VKLrueaQ5HPVVx4maEUdTsk9mZRlBB6nPXQJAHW/jI0qBqG7hFmhZdRN9Ag2bjGbtuK44 zg/9/dt86n8ASKqu8Q9z1MAslPwm++S9rE02Oif5mlfIl62zlUZhi+ChvaCM+NbZ7u17edo2 0QHnFIQwBqlA29xFzjq9pnzpIe0xxLLuuG8yFe/yWfwAnI1S9Yp5UlDdmF6GMtRroXtmxPud SnMk6K5wvtvY2mkBSc96ug4EYyZfFyUxjnAfcANFCRGnTyF6XxPOBzhKMeYDBu/SIHCyhF2V QFLdSYa0uGSdjqf0hgd09TDa/r7b/pytxJP8+6AZXgQ93JlB+rYfvaLcjypgmPhxXX8UugH8 GaeZGaFZcYvkdsmjE6SWZuM0QfsML9BdSvFT6+Bf0c45rEhO2c8NTyFUsdqC51C1vamReR6R hTc7TFclT++/n29N0ns70edn2lMQ/lDN3uNkQV2xABXFrT1yXdkwN1/7dGnv/4Q+4ihrXJcr y6CP6DJJuIiIRK/x6AVszd4S/2PjmxLiSLpuPLjQ18ZsUJrzqDO7Cc46QTgizVTu+sTEL195 J6quiELm3MB9Ut+6EKzSoJUdNnF/PE/HkzTssQlxZWdO8Yyw3GF2HtHfcyZrW6ZDrZEsnhUC otkmigsAEQEAAcLBXwQYAQIACQUCTouXWgIbDAAKCRDkIJuMiuip0eDBD/9rj2V4zO+DWtY0 HCIn5Cz7HBSw8hRs8orv1QQYUoDZBn5zqIdmjc1SCyNOqTXEEBAnruPE9vxgI0QkuW9uyAWh wL7+rzHZefUx5H2HI1FPGfPL5we37gnpf1S+PhOKobd3KKaiQ0DFqdTqPlZIkGXChIXPF0bG g6HSY/vVHYC4Rqysj/Sw+74nGzJRSisNt60W0LPRcWdbEX4zEvdUJX4YAbUBoEKLOt1VmRXt UeC8hgVOuIxkIVsWlHgVlztn0e0BtOutlR5Lu28D/CWObjHJG6+Kq0PgUiFiHmUFpAhiuPyO nwZOLHdVxflxJBdO8GVRV6GqygZQ8fcg/neDb2waYRBUOROEMzNn5+tG11QBbbYLoBL8eKt3 kgaSfasOaWV5e1+Y6OkZXfjlYqbLkgaFB7ZizUlfsq9sp/aAlAfU5hUISSCaSMinRUQTy6+y +9WGZrrwsWZO7wdq1ccGE6bXFRWhteq5UIJS8cg0m0vnrsv9GddFBeNaF34Ye9hlD05ofBuc PTfbCfHxsndrq+vPPR64uZrh9i7qO/KFZwKns4yGhO78umvHuyinOvEHA2Of1bOP/ohIbTAz VHjokMI4EXkVzgVP9EgwzBwX1PWi6OEFIG0yWltbmFXnn3clTIa/uG1c0VpCRuGtSEtqfC7n yrXvw9qg2waGcnb8WuoS+g== Organization: World Organi{s,z}ation Of Broken Dreams Message-ID: <98318e6c-adcd-ddb8-ad92-e7c1fa771c84@jonmasters.org> Date: Sat, 9 Jun 2018 09:09:35 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180529121121.24927-13-marc.zyngier@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 104.153.224.165 X-SA-Exim-Mail-From: jcm@jonmasters.org Subject: Re: [PATCH v2 12/17] arm64: KVM: Add ARCH_WORKAROUND_2 support for guests X-SA-Exim-Version: 4.2.1 (built Sun, 08 Nov 2009 07:31:22 +0000) X-SA-Exim-Scanned: Yes (on edison.jonmasters.org) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/29/2018 08:11 AM, Marc Zyngier wrote: > In order to offer ARCH_WORKAROUND_2 support to guests, we need > a bit of infrastructure. > > Let's add a flag indicating whether or not the guest uses > SSBD mitigation. Depending on the state of this flag, allow > KVM to disable ARCH_WORKAROUND_2 before entering the guest, > and enable it when exiting it. ...Live migration? Jon.