From nobody Thu Dec 18 17:49:43 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.zoho.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; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1496337777655951.3604349294909; Thu, 1 Jun 2017 10:22:57 -0700 (PDT) Received: from localhost ([::1]:45850 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dGToE-0003YN-HY for importer@patchew.org; Thu, 01 Jun 2017 13:22:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35193) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dGTcY-000171-3g for qemu-devel@nongnu.org; Thu, 01 Jun 2017 13:10:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dGTcW-0006Av-Rn for qemu-devel@nongnu.org; Thu, 01 Jun 2017 13:10:50 -0400 Received: from orth.archaic.org.uk ([2001:8b0:1d0::2]:37146) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dGTcW-00068M-Ka for qemu-devel@nongnu.org; Thu, 01 Jun 2017 13:10:48 -0400 Received: from pm215 by orth.archaic.org.uk with local (Exim 4.84_2) (envelope-from ) id 1dGTcO-0007Om-Az for qemu-devel@nongnu.org; Thu, 01 Jun 2017 18:10:40 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Date: Thu, 1 Jun 2017 18:10:14 +0100 Message-Id: <1496337035-30213-7-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1496337035-30213-1-git-send-email-peter.maydell@linaro.org> References: <1496337035-30213-1-git-send-email-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:8b0:1d0::2 Subject: [Qemu-devel] [PULL 06/27] target/arm: clear PMUVER field of AA64DFR0 when vPMU=off 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: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Wei Huang The PMUv3 driver of linux kernel (in arch/arm64/kernel/perf_event.c) relies on the PMUVER field of id_aa64dfr0_el1 to decide if PMU support is present or not. This patch clears the PMUVER field under TCG mode when vPMU=3Doff. Without it, PMUv3 will init insider guest VMs even with vPMU=3Doff. This patch also removes a redundant line inside the if-statement. Signed-off-by: Wei Huang Message-id: 1495123889-32301-1-git-send-email-wei@redhat.com Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- target/arm/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/arm/cpu.c b/target/arm/cpu.c index c185eb1..4e8fe1c 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -750,8 +750,8 @@ static void arm_cpu_realizefn(DeviceState *dev, Error *= *errp) } =20 if (!cpu->has_pmu) { - cpu->has_pmu =3D false; unset_feature(env, ARM_FEATURE_PMU); + cpu->id_aa64dfr0 &=3D ~0xf00; } =20 if (!arm_feature(env, ARM_FEATURE_EL2)) { --=20 2.7.4