From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 6E5C9C43331 for ; Wed, 13 Nov 2019 02:23:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BFD3222C9 for ; Wed, 13 Nov 2019 02:23:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573611802; bh=pDr1sift67S8LRLwSaPY2s2L0AtsVnaKQz8TwC2QZ/4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=C5TLA2G6e2FdomXKvzVur2+wnfxsu4yU2UHbLPBJ9pkt0lpqD4TVf+WW5Z2YEoIcT phgzNjFGiPKKU3AuVeu5svdt4481CwWxDmCavh3qNnlRppy002kfpeSc9lTROqjpkc hllzBqcn+aZ+YYGkDpUA9fjL6AFGflww0W3SByFk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729441AbfKMCXV (ORCPT ); Tue, 12 Nov 2019 21:23:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:41898 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728386AbfKMBwp (ORCPT ); Tue, 12 Nov 2019 20:52:45 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F10D320674; Wed, 13 Nov 2019 01:52:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573609964; bh=pDr1sift67S8LRLwSaPY2s2L0AtsVnaKQz8TwC2QZ/4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nv4IiM9NgIUNK3G+6sLxX+pqX1ecvXXluAe2w/8SP9npU2eFRXjnm2bPtBwf3J+Zi PgG5So2S1mtpbEC+Ui0zN5SiVYnGyxsul1gKoCSc/1W4hNCOahdz/Zyuw4SDeQr/CU 2ynK8CQpL4BPsrIB8t/rUYckZVVANRr06L8t4K/A= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Cameron Kaiser , Paul Mackerras , Sasha Levin , kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 4.19 095/209] KVM: PPC: Book3S PR: Exiting split hack mode needs to fixup both PC and LR Date: Tue, 12 Nov 2019 20:48:31 -0500 Message-Id: <20191113015025.9685-95-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191113015025.9685-1-sashal@kernel.org> References: <20191113015025.9685-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Cameron Kaiser [ Upstream commit 1006284c5e411872333967b1970c2ca46a9e225f ] When an OS (currently only classic Mac OS) is running in KVM-PR and makes a linked jump from code with split hack addressing enabled into code that does not, LR is not correctly updated and reflects the previously munged PC. To fix this, this patch undoes the address munge when exiting split hack mode so that code relying on LR being a proper address will now execute. This does not affect OS X or other operating systems running on KVM-PR. Signed-off-by: Cameron Kaiser Signed-off-by: Paul Mackerras Signed-off-by: Sasha Levin --- arch/powerpc/kvm/book3s.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 281f074581a3b..cc05f346e0421 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -78,8 +78,11 @@ void kvmppc_unfixup_split_real(struct kvm_vcpu *vcpu) { if (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) { ulong pc = kvmppc_get_pc(vcpu); + ulong lr = kvmppc_get_lr(vcpu); if ((pc & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS) kvmppc_set_pc(vcpu, pc & ~SPLIT_HACK_MASK); + if ((lr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS) + kvmppc_set_lr(vcpu, lr & ~SPLIT_HACK_MASK); vcpu->arch.hflags &= ~BOOK3S_HFLAG_SPLIT_HACK; } } -- 2.20.1