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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED 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 AB4DBC433DB for ; Sat, 13 Mar 2021 05:07:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5526A64F8C for ; Sat, 13 Mar 2021 05:07:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5526A64F8C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id EC15A6B0073; Sat, 13 Mar 2021 00:07:17 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E998F6B0074; Sat, 13 Mar 2021 00:07:17 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D89766B0075; Sat, 13 Mar 2021 00:07:17 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0169.hostedemail.com [216.40.44.169]) by kanga.kvack.org (Postfix) with ESMTP id B98366B0073 for ; Sat, 13 Mar 2021 00:07:17 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 6AB911844C6C7 for ; Sat, 13 Mar 2021 05:07:17 +0000 (UTC) X-FDA: 77913667314.09.B4233BA Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf25.hostedemail.com (Postfix) with ESMTP id 1D65A6000105 for ; Sat, 13 Mar 2021 05:07:14 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id E839164F8E; Sat, 13 Mar 2021 05:07:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1615612036; bh=mYx7MMzzJBF4Ub8ji9m9ernyQMZahSWn3jAx5UDgxwM=; h=Date:From:To:Subject:In-Reply-To:From; b=cBrkFWvxRymQSju/BIsxCIa/gMAtgqmyomzBASmgM+d8HKkePZZ0ruaLanYOVArxN 4AzEwszxDbUyS7eJov1+BQKHMEn5mXxp3iX+gb6YQbFPiu7q6x0o+5xm0eOAIktZR7 KAmii/b4nUCEq4/msQayLSz5w5RRdiEqt6dwHcsc= Date: Fri, 12 Mar 2021 21:07:15 -0800 From: Andrew Morton To: akpm@linux-foundation.org, fenghua.yu@intel.com, jacob.jun.pan@intel.com, jean-philippe@linaro.org, linux-mm@kvack.org, mm-commits@vger.kernel.org, tony.luck@intel.com, torvalds@linux-foundation.org Subject: [patch 05/29] mm/fork: clear PASID for new mm Message-ID: <20210313050715.M6patTVza%akpm@linux-foundation.org> In-Reply-To: <20210312210632.9b7d62973d72a56fb13c7a03@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Stat-Signature: g7napz341ch5fqqqforb7u7z6d45iuxi X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1D65A6000105 Received-SPF: none (linux-foundation.org>: No applicable sender policy available) receiver=imf25; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615612034-383885 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Fenghua Yu Subject: mm/fork: clear PASID for new mm 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 --- include/linux/mm_types.h | 1 + kernel/fork.c | 8 ++++++++ 2 files changed, 9 insertions(+) --- a/include/linux/mm_types.h~mm-fork-clear-pasid-for-new-mm +++ a/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; --- a/kernel/fork.c~mm-fork-clear-pasid-for-new-mm +++ a/kernel/fork.c @@ -994,6 +994,13 @@ static void mm_init_owner(struct mm_stru #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 @@ -1024,6 +1031,7 @@ static struct mm_struct *mm_init(struct 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); _