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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A073C4707F for ; Tue, 8 Feb 2022 01:05:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344699AbiBHBDv (ORCPT ); Mon, 7 Feb 2022 20:03:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245441AbiBGXD3 (ORCPT ); Mon, 7 Feb 2022 18:03:29 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4FAE8C043181 for ; Mon, 7 Feb 2022 15:03:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1644275009; x=1675811009; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=qAN6i2tcGpKHAdLmfykkJrrQYTFoSpMh8/ZHA7l/RSs=; b=GpP7HVsV0ZT44Q5jMpLdlHIl/lreOIp502LymK7yz2L5lx8uTeLcNobf FE2YGwq+yLLs7g0Y7mXF4QBSCF7whIi4u4tkwhOxn3LO7S0EtV73tq27k p9UMKLvR56USnH13L286N7eqdmDqxMTh+aMPqSXOKksd5t3tinXW1LSNO p4DJAhCWqLvYpziUD2R8XCrOy4cI/mQxnK2JJU044eq2mG48CLtLHzxrJ 4Pg4L8W7CUZXcO7eSZW62csizyxwZYQpFe9pO3sw39vkYFPSQDZXkhlrU FiQuU4uwudCFlEnNQDa5sxsJjm7BBVpdNYzwQ2+/yPsvvXKGFKOAEFqk0 g==; X-IronPort-AV: E=McAfee;i="6200,9189,10251"; a="229475017" X-IronPort-AV: E=Sophos;i="5.88,351,1635231600"; d="scan'208";a="229475017" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Feb 2022 15:03:06 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,351,1635231600"; d="scan'208";a="540324076" Received: from otcwcpicx3.sc.intel.com ([172.25.55.73]) by orsmga008.jf.intel.com with ESMTP; 07 Feb 2022 15:03:05 -0800 From: Fenghua Yu To: "Thomas Gleixner" , "Dave Hansen" , "Ingo Molnar" , "Borislav Petkov" , "Peter Zijlstra" , "Andy Lutomirski" , "Tony Luck" , "Lu Baolu" , "Joerg Roedel" , Josh Poimboeuf , "Jacob Pan" , "Ashok Raj" , "Ravi V Shankar" Cc: iommu@lists.linux-foundation.org, "x86" , "linux-kernel" , Fenghua Yu Subject: [PATCH v4 07/11] sched: Define and initialize a flag to identify valid PASID in the task Date: Mon, 7 Feb 2022 15:02:50 -0800 Message-Id: <20220207230254.3342514-8-fenghua.yu@intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220207230254.3342514-1-fenghua.yu@intel.com> References: <20220207230254.3342514-1-fenghua.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reviewed-by: Thomas Gleixner --- v4: - Add "Reviewed-by: Thomas Gleixner " (Thomas). 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 75ba8aa60248..4e5de3aed410 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -938,6 +938,9 @@ 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 c03c6682464c..51fd1df994b7 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -968,6 +968,10 @@ 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 -- 2.35.1