From patchwork Wed Sep 2 09:29:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Przywara X-Patchwork-Id: 264414 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7215FC433E2 for ; Wed, 2 Sep 2020 09:29:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5180A20829 for ; Wed, 2 Sep 2020 09:29:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726210AbgIBJ3N (ORCPT ); Wed, 2 Sep 2020 05:29:13 -0400 Received: from foss.arm.com ([217.140.110.172]:34208 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726140AbgIBJ3M (ORCPT ); Wed, 2 Sep 2020 05:29:12 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5C25C31B; Wed, 2 Sep 2020 02:29:12 -0700 (PDT) Received: from donnerap.arm.com (donnerap.cambridge.arm.com [10.1.195.35]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ABFAC3F68F; Wed, 2 Sep 2020 02:29:11 -0700 (PDT) From: Andre Przywara To: stable@vger.kernel.org Cc: James Morse , Marc Zyngier , Catalin Marinas Subject: [PATCH stable v5.8 v2 0/2] KVM: arm64: Fix AT instruction handling Date: Wed, 2 Sep 2020 10:29:02 +0100 Message-Id: <20200902092904.122477-1-andre.przywara@arm.com> X-Mailer: git-send-email 2.17.1 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Changes from v1: - (Re-)adding Marc's review tags from upstream. Differences to the original patches are trivial for 2/2, and straight-forward for 1/2. - Fix spelling of vaxorcism ------------- In some architectural corner cases, AT instructions can generate an exception, which KVM is not really ready to handle properly. Teach the code to handle this situation gracefully. This is a backport of the respective upstream patches to v5.8(.5). James prepared and tested these already, but we were lacking the upstream commit ID so far. I am sending this on his behalf, since he is off this week. The last two of the originally three patches were tagged Cc: stable already, but 2/3 did not apply cleanly, hence this specific backport. 3/3 has already been added to stable-queue, so I am dropping it from this post. Cheers, Andre. James Morse (2): KVM: arm64: Add kvm_extable for vaxorcism code KVM: arm64: Survive synchronous exceptions caused by AT instructions arch/arm64/include/asm/kvm_asm.h | 43 +++++++++++++++++++++ arch/arm64/kernel/vmlinux.lds.S | 8 ++++ arch/arm64/kvm/hyp/entry.S | 15 +++++--- arch/arm64/kvm/hyp/hyp-entry.S | 65 ++++++++++++++++++++------------ arch/arm64/kvm/hyp/switch.c | 39 +++++++++++++++++-- 5 files changed, 136 insertions(+), 34 deletions(-)