From nobody Mon Feb 9 01:16:16 2026 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=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1529966242712324.76140263624904; Mon, 25 Jun 2018 15:37:22 -0700 (PDT) Received: from localhost ([::1]:49560 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXa6s-0002mW-0Q for importer@patchew.org; Mon, 25 Jun 2018 18:37:22 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54385) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXZvk-0001vv-8a for qemu-devel@nongnu.org; Mon, 25 Jun 2018 18:25:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fXZvj-0003LR-9q for qemu-devel@nongnu.org; Mon, 25 Jun 2018 18:25:52 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35718) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fXZvj-0003Kn-3b for qemu-devel@nongnu.org; Mon, 25 Jun 2018 18:25:51 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 61076307D865; Mon, 25 Jun 2018 22:25:50 +0000 (UTC) Received: from localhost (ovpn-116-16.gru2.redhat.com [10.97.116.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id E343D26DFD; Mon, 25 Jun 2018 22:25:49 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , qemu-devel@nongnu.org Date: Mon, 25 Jun 2018 19:25:24 -0300 Message-Id: <20180625222524.382-13-ehabkost@redhat.com> In-Reply-To: <20180625222524.382-1-ehabkost@redhat.com> References: <20180625222524.382-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Mon, 25 Jun 2018 22:25:50 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 12/12] i386: Remove generic SMT thread check 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: , Cc: Paolo Bonzini , Babu Moger , Richard Henderson 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: Babu Moger Remove generic non-intel check while validating hyperthreading support. Certain AMD CPUs can support hyperthreading now. CPU family with TOPOEXT feature can support hyperthreading now. Signed-off-by: Babu Moger Tested-by: Geoffrey McRae Reviewed-by: Eduardo Habkost Message-Id: <1529443919-67509-4-git-send-email-babu.moger@amd.com> Signed-off-by: Eduardo Habkost --- target/i386/cpu.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index d6ed29b484..e6c2f8a22a 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -4985,17 +4985,22 @@ static void x86_cpu_realizefn(DeviceState *dev, Err= or **errp) =20 qemu_init_vcpu(cs); =20 - /* Only Intel CPUs support hyperthreading. Even though QEMU fixes this - * issue by adjusting CPUID_0000_0001_EBX and CPUID_8000_0008_ECX - * based on inputs (sockets,cores,threads), it is still better to gives + /* + * Most Intel and certain AMD CPUs support hyperthreading. Even though= QEMU + * fixes this issue by adjusting CPUID_0000_0001_EBX and CPUID_8000_00= 08_ECX + * based on inputs (sockets,cores,threads), it is still better to give * users a warning. * * NOTE: the following code has to follow qemu_init_vcpu(). Otherwise * cs->nr_threads hasn't be populated yet and the checking is incorrec= t. */ - if (!IS_INTEL_CPU(env) && cs->nr_threads > 1 && !ht_warned) { - error_report("AMD CPU doesn't support hyperthreading. Please confi= gure" - " -smp options properly."); + if (IS_AMD_CPU(env) && + !(env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) && + cs->nr_threads > 1 && !ht_warned) { + error_report("This family of AMD CPU doesn't support " + "hyperthreading(%d). Please configure -smp " + "options properly or try enabling topoext feature= .", + cs->nr_threads); ht_warned =3D true; } =20 --=20 2.18.0.rc1.1.g3f1ff2140