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 Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 09959C433EF for ; Fri, 17 Dec 2021 22:02:09 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id BF0BB40AB1; Fri, 17 Dec 2021 22:02:08 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YgDD6PYBhHBN; Fri, 17 Dec 2021 22:02:04 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp2.osuosl.org (Postfix) with ESMTPS id 047C040C56; Fri, 17 Dec 2021 22:02:03 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 39C10C007F; Fri, 17 Dec 2021 22:02:03 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 47727C002F for ; Fri, 17 Dec 2021 22:02:01 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 01E496116F for ; Fri, 17 Dec 2021 22:01:59 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp3.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=intel.com Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D4dgksIKa-Dh for ; Fri, 17 Dec 2021 22:01:58 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by smtp3.osuosl.org (Postfix) with ESMTPS id 622DF61147 for ; Fri, 17 Dec 2021 22:01:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639778518; x=1671314518; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=UnMZO3dIpMprFJhYU1oJBcxLAM+pPp7MOtKZRkV+U7g=; b=cHeWY+WpUUcwiBVSwFgnOgzq1+Psw6mtloS4f6Zki0YU/FCySCF3HgHQ y4Ko5ze212CezU105+pmmSgHv1QgBAIrSvrSTFrQjOVKu+WDVB3YQZaYT UofnPrHj3Kf8lF/Yhr3ODhxE1+NAIawBp2PFg3vpryd11+xGe6L5Dk7dD 7pwoTQhkzyQg30wVXO7qkcvPqZnFph99CjEvCYvQjQr86SB+xVOIh/r6/ dSzhLtYNwEN2Pr/dNKS6mrbN9VYgIXJitEOw7pvv4LwO6F1bx13SQaFFo anvDcxO8nXI4Sdh4BvtTdvhaV+fAa0+ogZBUMJacZaCam6kGzw01i8+km Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10201"; a="239793589" X-IronPort-AV: E=Sophos;i="5.88,214,1635231600"; d="scan'208";a="239793589" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2021 14:01:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,214,1635231600"; d="scan'208";a="506928102" Received: from otcwcpicx3.sc.intel.com ([172.25.55.73]) by orsmga007.jf.intel.com with ESMTP; 17 Dec 2021 14:01:49 -0800 From: Fenghua Yu To: "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Peter Zijlstra" , "Andy Lutomirski" , "Dave Hansen" , "Tony Luck" , "Lu Baolu" , "Joerg Roedel" , Josh Poimboeuf , "Jacob Pan" , "Ashok Raj" , "Ravi V Shankar" Subject: [PATCH v2 07/11] sched: Define and initialize a flag to identify valid PASID in the task Date: Fri, 17 Dec 2021 22:01:32 +0000 Message-Id: <20211217220136.2762116-8-fenghua.yu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211217220136.2762116-1-fenghua.yu@intel.com> References: <20211217220136.2762116-1-fenghua.yu@intel.com> MIME-Version: 1.0 Cc: Fenghua Yu , iommu@lists.linux-foundation.org, x86 , linux-kernel X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" From: Peter Zijlstra Add a new single bit field to the task structure to track whether this task has initialized the IA32_PASID MSR to the mm's PASID. Initialize the field to zero when creating a new task with fork/clone. Signed-off-by: Peter Zijlstra Co-developed-by: Fenghua Yu Signed-off-by: Fenghua Yu Reviewed-by: Tony Luck --- v2: - Change condition to more accurate CONFIG_IOMMU_SVA (Jacob) 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 78c351e35fec..41a0b5703f94 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -933,6 +933,9 @@ struct task_struct { /* Recursion prevention for eventfd_signal() */ unsigned in_eventfd_signal:1; #endif +#ifdef CONFIG_IOMMU_SVA + unsigned pasid_activated:1; +#endif unsigned long atomic_flags; /* Flags requiring atomic access. */ diff --git a/kernel/fork.c b/kernel/fork.c index 3adad225cc09..cd297926b6f2 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -967,6 +967,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) tsk->use_memdelay = 0; #endif +#ifdef CONFIG_IOMMU_SVA + tsk->pasid_activated = 0; +#endif + #ifdef CONFIG_MEMCG tsk->active_memcg = NULL; #endif -- 2.34.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu