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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D031AC433FE for ; Wed, 3 Nov 2021 13:26:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA2A460E98 for ; Wed, 3 Nov 2021 13:26:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231643AbhKCN3Q (ORCPT ); Wed, 3 Nov 2021 09:29:16 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:25353 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231393AbhKCN3N (ORCPT ); Wed, 3 Nov 2021 09:29:13 -0400 Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.54]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4HknVP3Qytzbhb2; Wed, 3 Nov 2021 21:21:49 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.15; Wed, 3 Nov 2021 21:26:34 +0800 Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.15; Wed, 3 Nov 2021 21:26:33 +0800 From: Kefeng Wang To: Russell King , , CC: Alexander Potapenko , Marco Elver , Dmitry Vyukov , Kefeng Wang Subject: [PATCH v2 1/3] ARM: mm: Provide set_memory_valid() Date: Wed, 3 Nov 2021 21:38:43 +0800 Message-ID: <20211103133845.78528-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20211103133845.78528-1-wangkefeng.wang@huawei.com> References: <20211103133845.78528-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This function validates and invalidates PTE entries, it will be used in the later patch. Signed-off-by: Kefeng Wang --- arch/arm/include/asm/set_memory.h | 1 + arch/arm/mm/pageattr.c | 42 +++++++++++++++++++++++-------- 2 files changed, 33 insertions(+), 10 deletions(-) diff --git a/arch/arm/include/asm/set_memory.h b/arch/arm/include/asm/set_memory.h index ec17fc0fda7a..0211b9c5b14d 100644 --- a/arch/arm/include/asm/set_memory.h +++ b/arch/arm/include/asm/set_memory.h @@ -11,6 +11,7 @@ int set_memory_ro(unsigned long addr, int numpages); int set_memory_rw(unsigned long addr, int numpages); int set_memory_x(unsigned long addr, int numpages); int set_memory_nx(unsigned long addr, int numpages); +int set_memory_valid(unsigned long addr, int numpages, int enable); #else static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; } static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; } diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c index 9790ae3a8c68..c3c34fe714b0 100644 --- a/arch/arm/mm/pageattr.c +++ b/arch/arm/mm/pageattr.c @@ -32,14 +32,31 @@ static bool in_range(unsigned long start, unsigned long size, size <= range_end - start; } +/* + * This function assumes that the range is mapped with PAGE_SIZE pages. + */ +static int __change_memory_common(unsigned long start, unsigned long size, + pgprot_t set_mask, pgprot_t clear_mask) +{ + struct page_change_data data; + int ret; + + data.set_mask = set_mask; + data.clear_mask = clear_mask; + + ret = apply_to_page_range(&init_mm, start, size, change_page_range, + &data); + + flush_tlb_kernel_range(start, start + size); + return ret; +} + static int change_memory_common(unsigned long addr, int numpages, pgprot_t set_mask, pgprot_t clear_mask) { unsigned long start = addr & PAGE_MASK; unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE; unsigned long size = end - start; - int ret; - struct page_change_data data; WARN_ON_ONCE(start != addr); @@ -50,14 +67,7 @@ static int change_memory_common(unsigned long addr, int numpages, !in_range(start, size, VMALLOC_START, VMALLOC_END)) return -EINVAL; - data.set_mask = set_mask; - data.clear_mask = clear_mask; - - ret = apply_to_page_range(&init_mm, start, size, change_page_range, - &data); - - flush_tlb_kernel_range(start, end); - return ret; + return __change_memory_common(start, size, set_mask, clear_mask); } int set_memory_ro(unsigned long addr, int numpages) @@ -87,3 +97,15 @@ int set_memory_x(unsigned long addr, int numpages) __pgprot(0), __pgprot(L_PTE_XN)); } + +int set_memory_valid(unsigned long addr, int numpages, int enable) +{ + if (enable) + return __change_memory_common(addr, PAGE_SIZE * numpages, + __pgprot(L_PTE_VALID), + __pgprot(0)); + else + return __change_memory_common(addr, PAGE_SIZE * numpages, + __pgprot(0), + __pgprot(L_PTE_VALID)); +} -- 2.26.2