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[23.128.96.18]) by mx.google.com with ESMTP id f12si6202029ejx.143.2020.07.02.08.26.34; Thu, 02 Jul 2020 08:26:57 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=rzmaWld0; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730284AbgGBPXy (ORCPT + 99 others); Thu, 2 Jul 2020 11:23:54 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:54680 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726807AbgGBPXy (ORCPT ); Thu, 2 Jul 2020 11:23:54 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 062FMWEe186983; Thu, 2 Jul 2020 15:23:47 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=kkfvYworqJqVbvmXpZkoO213bi9Sr3ObjvqMzgZoE6Q=; b=rzmaWld0zx6vpbXUWgm3TnEd8g/nE/AWRcKBAcrT0V5jo17QtNvUAqjXQaIHOftH/eYL nqWzVjtJgnsSwPTBGTGlC9MyZIf622BVX2dMO6zyj4OD1xfqV4DCdKy/Pus4LA7V4Xqa 3o2HoXGsXnK/YMKYa1v9m6tWsdcLy2YGbA/K0Aam4RQ8kqooblNi/bGaR2ZTUBmJLUh7 xQxCkFThjE9cPMEMitXUWYtn6ra8N3X/KzxzGottCBlGcZzj+V+Bq5G0yRX/XiruWJQo nfAfSEca0TIZWsc4YMoJiFpfGkg1xA0SUlsEgPXKQtgtHTCPDDI5OmBv7wdfXyAcMIsT GQ== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 31xx1e5xpw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 02 Jul 2020 15:23:46 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 062EvrAj162760; Thu, 2 Jul 2020 15:21:46 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 31xg2144en-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Jul 2020 15:21:46 +0000 Received: from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 062FLjno000819; Thu, 2 Jul 2020 15:21:45 GMT Received: from mihai.localdomain (/10.153.73.25) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 02 Jul 2020 15:20:53 +0000 From: Mihai Carabas To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, Mihai Carabas Subject: [PATCH RFC 4/7] x86: cpu: bugs.c: update cpu_smt_disable to be callable at runtime Date: Thu, 2 Jul 2020 18:18:24 +0300 Message-Id: <1593703107-8852-5-git-send-email-mihai.carabas@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1593703107-8852-1-git-send-email-mihai.carabas@oracle.com> References: <1593703107-8852-1-git-send-email-mihai.carabas@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9670 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 phishscore=0 malwarescore=0 mlxlogscore=935 adultscore=0 mlxscore=0 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2007020106 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9670 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 clxscore=1015 adultscore=0 suspectscore=1 mlxlogscore=957 cotscore=-2147483648 lowpriorityscore=0 malwarescore=0 phishscore=0 impostorscore=0 mlxscore=0 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2007020107 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If the microcode late loading and bug mitigation logic needs to turn off SMT, it must use the hot plug infrastructure, not the boot time call "cpu_smt_disable". Update "cpu_smt_disable" to use the hot plug infrastructure to turn off SMT when the system is in state running. Signed-off-by: Mihai Carabas --- kernel/cpu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index fe67a01..719670f 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -393,9 +393,25 @@ void __weak arch_smt_update(void) { } void cpu_smt_disable(bool force) { + int ret; + if (!cpu_smt_possible()) return; + if (system_state == SYSTEM_RUNNING) { + if (force) + ret = cpuhp_smt_disable(CPU_SMT_FORCE_DISABLED); + else + ret = cpuhp_smt_disable(CPU_SMT_DISABLED); + + /* If SMT disable did not succeed, print a warning*/ + if (ret) + pr_warn("SMT: not disabled %d\n", ret); + else + pr_info("SMT:%s disabled\n", force ? " Force" : ""); + return; + } + if (force) { pr_info("SMT: Force disabled\n"); cpu_smt_control = CPU_SMT_FORCE_DISABLED; -- 1.8.3.1