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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 4204EC432C0 for ; Fri, 22 Nov 2019 11:19:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1B6C420708 for ; Fri, 22 Nov 2019 11:19:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574421584; bh=P+UQtROkCA51/TMMU3JLQRCuGXr6mCdR6xtD5hFuvU4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=b+Qc5xXjCL9uzCsHUcwBy1qP1v6Kby3u6EyPWNKzVDvgEsBu6F5DLtCarnmAAarcJ Ya64Ri+hB/d/GasrrONJsKhsM/m5y2pXc8HXzqN0SsUCGbRYywwIk+7AkpGXDDnTIN U/5hrT5dfkoDtKZlDl+1bIf0SI8LTeXW8GTsQDXY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728826AbfKVLTj (ORCPT ); Fri, 22 Nov 2019 06:19:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:55112 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726942AbfKVKrT (ORCPT ); Fri, 22 Nov 2019 05:47:19 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0A21D20656; Fri, 22 Nov 2019 10:47:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574419638; bh=P+UQtROkCA51/TMMU3JLQRCuGXr6mCdR6xtD5hFuvU4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DfwyjoByUpsXEKmB5q6agsRtfUFQ4+CTnU6rwf9nxVAix5QuKo8iLJ++dEgnTCLRk HqSqbnCoHaJxoq7KDBfDV+zRoOT9se22di2qBmOSlzqtaVMhYdTvp4gnIRsW420Tzu IMHxlWBWSoQxFSagSu5Hitiv+KONFePEMXNxvhis= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Cameron Kaiser , Paul Mackerras , Sasha Levin Subject: [PATCH 4.9 182/222] KVM: PPC: Book3S PR: Exiting split hack mode needs to fixup both PC and LR Date: Fri, 22 Nov 2019 11:28:42 +0100 Message-Id: <20191122100915.509282448@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191122100830.874290814@linuxfoundation.org> References: <20191122100830.874290814@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 73c3c127d8584..209cad89a11a5 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