From nobody Wed Apr 16 13:37:41 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 15342729564488.850964943513077; Tue, 14 Aug 2018 11:55:56 -0700 (PDT) Received: from localhost ([::1]:45798 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpeTz-0006Mq-AH for importer@patchew.org; Tue, 14 Aug 2018 14:55:55 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52840) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpdvp-0005Ce-AJ for qemu-devel@nongnu.org; Tue, 14 Aug 2018 14:22:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fpduI-0006qd-R1 for qemu-devel@nongnu.org; Tue, 14 Aug 2018 14:20:37 -0400 Received: from orth.archaic.org.uk ([2001:8b0:1d0::2]:44428) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fpduI-0006nb-Ba for qemu-devel@nongnu.org; Tue, 14 Aug 2018 14:19:02 -0400 Received: from pm215 by orth.archaic.org.uk with local (Exim 4.89) (envelope-from ) id 1fpduF-0007NX-A2 for qemu-devel@nongnu.org; Tue, 14 Aug 2018 19:18:59 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Date: Tue, 14 Aug 2018 19:18:07 +0100 Message-Id: <20180814181815.23348-38-peter.maydell@linaro.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180814181815.23348-1-peter.maydell@linaro.org> References: <20180814181815.23348-1-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2001:8b0:1d0::2 Subject: [Qemu-devel] [PULL 37/45] target/arm: Treat SCTLR_EL1.M as if it were zero when HCR_EL2.TGE is set X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RDMRC_1 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" One of the required effects of setting HCR_EL2.TGE is that when SCR_EL3.NS is 1 then SCTLR_EL1.M must behave as if it is zero for all purposes except direct reads. That is, it effectively disables the MMU for the NS EL0/EL1 translation regime. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Message-id: 20180724115950.17316-6-peter.maydell@linaro.org --- target/arm/helper.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/arm/helper.c b/target/arm/helper.c index 7b438e43a90..62f63e4e5b9 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -8396,6 +8396,14 @@ static inline bool regime_translation_disabled(CPUAR= MState *env, if (mmu_idx =3D=3D ARMMMUIdx_S2NS) { return (env->cp15.hcr_el2 & HCR_VM) =3D=3D 0; } + + if (env->cp15.hcr_el2 & HCR_TGE) { + /* TGE means that NS EL0/1 act as if SCTLR_EL1.M is zero */ + if (!regime_is_secure(env, mmu_idx) && regime_el(env, mmu_idx) =3D= =3D 1) { + return true; + } + } + return (regime_sctlr(env, mmu_idx) & SCTLR_M) =3D=3D 0; } =20 --=20 2.18.0