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=-10.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 05217C433DF for ; Thu, 25 Jun 2020 20:18:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D820A207FC for ; Thu, 25 Jun 2020 20:18:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436608AbgFYUSx (ORCPT ); Thu, 25 Jun 2020 16:18:53 -0400 Received: from mga18.intel.com ([134.134.136.126]:20516 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436569AbgFYUSn (ORCPT ); Thu, 25 Jun 2020 16:18:43 -0400 IronPort-SDR: RY4ShrntDlOkzVpQk7kaVDWo2dU+xTKWUhZSo7aLvYuHiMVmf7g8R8SFcyCnm/et0DfwQs2OzD cXTCl0A/exaw== X-IronPort-AV: E=McAfee;i="6000,8403,9663"; a="132505309" X-IronPort-AV: E=Sophos;i="5.75,280,1589266800"; d="scan'208";a="132505309" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jun 2020 13:18:42 -0700 IronPort-SDR: xrLEX6jXl6rEaVUiklHSWzXFHRHdSQWc9ONOEfVZGeriPJKM0mQEgXeIG7Muf3nsaVpVfvI/0A IDgQnGriMQkQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,280,1589266800"; d="scan'208";a="453132264" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by orsmga005.jf.intel.com with ESMTP; 25 Jun 2020 13:18:41 -0700 From: Fenghua Yu To: "Thomas Gleixner" , "Joerg Roedel" , "Ingo Molnar" , "Borislav Petkov" , "Peter Zijlstra" , "H Peter Anvin" , "David Woodhouse" , "Lu Baolu" , "Dave Hansen" , "Tony Luck" , "Jean-Philippe Brucker" , "Christoph Hellwig" , "Ashok Raj" , "Jacob Jun Pan" , "Dave Jiang" , "Sohil Mehta" , "Ravi V Shankar" Cc: "linux-kernel" , "x86" , iommu@lists.linux-foundation.org, Fenghua Yu Subject: [PATCH v4 11/12] sched: Define and initialize a flag to identify valid PASID in the task Date: Thu, 25 Jun 2020 13:17:21 -0700 Message-Id: <1593116242-31507-12-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1593116242-31507-1-git-send-email-fenghua.yu@intel.com> References: <1593116242-31507-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra The flag is defined for the task to identify if the task has a valid PASID. Its initial value is 0 when the task is forked/cloned. It will be used shortly. Signed-off-by: Peter Zijlstra Co-developed-by: Fenghua Yu Signed-off-by: Fenghua Yu --- v2: - Add this patch to define the flag to identify valid PASID MSR (PeterZ) include/linux/sched.h | 3 +++ kernel/fork.c | 4 ++++ 2 files changed, 7 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index b62e6aaf28f0..1b5a6e5c74ca 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -801,6 +801,9 @@ struct task_struct { /* Stalled due to lack of memory */ unsigned in_memstall:1; #endif +#ifdef CONFIG_IOMMU_SUPPORT + unsigned has_valid_pasid:1; +#endif unsigned long atomic_flags; /* Flags requiring atomic access. */ diff --git a/kernel/fork.c b/kernel/fork.c index 43b5f112604d..0a962bebdf88 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -955,6 +955,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) tsk->use_memdelay = 0; #endif +#ifdef CONFIG_IOMMU_SUPPORT + tsk->has_valid_pasid = 0; +#endif + #ifdef CONFIG_MEMCG tsk->active_memcg = NULL; #endif -- 2.19.1