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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 89104C433E9 for ; Wed, 17 Mar 2021 01:01:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 657BF64F97 for ; Wed, 17 Mar 2021 01:01:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232248AbhCQBB1 (ORCPT ); Tue, 16 Mar 2021 21:01:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:36214 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231934AbhCQA6H (ORCPT ); Tue, 16 Mar 2021 20:58:07 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A77C264FB4; Wed, 17 Mar 2021 00:57:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615942678; bh=bezWuvKKjJyUVUS4m+Azpk96eTuvitpgqODjRa0cNIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kaxaVArVwT9IInx8Yr5XQf7Y5wMn2c/tzQAnLX7WY9ULYLkKq/w3SsFfigBBawOFW veS6gmrsCzYXmQK+7g1a4+JTGSO7FkMMvOy7MAC3Ehu6fTsVwtGbdnl3F6SPVSpSwe sQnyJtO/6OgYGIfOrJf50F60Fs9HhHzDvCLcJrARDC2e1gWYk2h4SBJmSti/UucOVc i8+57YCiC6xGXUzNpAR9pU0DyJG4HizOek+iYQxS6tR2Aw0cP0oyYNtWSk3ZUW7lD+ 9yYnRCgikSaNevEK2U6nYNRZI8g3N+csZOAJ+OzOKtNJ7cY0mppbQVUQzOKhFKep8E 0H/gAQ95woxIA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Fenghua Yu , Jean-Philippe Brucker , Tony Luck , Jacob Pan , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH AUTOSEL 5.10 52/54] mm/fork: clear PASID for new mm Date: Tue, 16 Mar 2021 20:56:51 -0400 Message-Id: <20210317005654.724862-52-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210317005654.724862-1-sashal@kernel.org> References: <20210317005654.724862-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fenghua Yu [ Upstream commit 82e69a121be4b1597ce758534816a8ee04c8b761 ] When a new mm is created, its PASID should be cleared, i.e. the PASID is initialized to its init state 0 on both ARM and X86. This patch was part of the series introducing mm->pasid, but got lost along the way [1]. It still makes sense to have it, because each address space has a different PASID. And the IOMMU code in iommu_sva_alloc_pasid() expects the pasid field of a new mm struct to be cleared. [1] https://lore.kernel.org/linux-iommu/YDgh53AcQHT+T3L0@otcwcpicx3.sc.intel.com/ Link: https://lkml.kernel.org/r/20210302103837.2562625-1-jean-philippe@linaro.org Signed-off-by: Fenghua Yu Signed-off-by: Jean-Philippe Brucker Reviewed-by: Tony Luck Cc: Jacob Pan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- include/linux/mm_types.h | 1 + kernel/fork.c | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 915f4f100383..3433ecc9c1f7 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -23,6 +23,7 @@ #endif #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) +#define INIT_PASID 0 struct address_space; struct mem_cgroup; diff --git a/kernel/fork.c b/kernel/fork.c index c675fdbd3dce..7c044d377926 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -992,6 +992,13 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p) #endif } +static void mm_init_pasid(struct mm_struct *mm) +{ +#ifdef CONFIG_IOMMU_SUPPORT + mm->pasid = INIT_PASID; +#endif +} + static void mm_init_uprobes_state(struct mm_struct *mm) { #ifdef CONFIG_UPROBES @@ -1022,6 +1029,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, mm_init_cpumask(mm); mm_init_aio(mm); mm_init_owner(mm, p); + mm_init_pasid(mm); RCU_INIT_POINTER(mm->exe_file, NULL); mmu_notifier_subscriptions_init(mm); init_tlb_flush_pending(mm); -- 2.30.1