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 0CAACC433F5 for ; Thu, 21 Apr 2022 03:44:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383995AbiDUDrR (ORCPT ); Wed, 20 Apr 2022 23:47:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242476AbiDUDrM (ORCPT ); Wed, 20 Apr 2022 23:47:12 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D7E64A1AD for ; Wed, 20 Apr 2022 20:44:23 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5488E1477; Wed, 20 Apr 2022 20:44:23 -0700 (PDT) Received: from [192.168.225.231] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 441B93F766; Wed, 20 Apr 2022 20:44:15 -0700 (PDT) Message-ID: <75f444a6-4f50-4356-9e71-f72c59bf0a52@arm.com> Date: Thu, 21 Apr 2022 09:14:54 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH -next v4 1/4] mm: page_table_check: move pxx_user_accessible_page into x86 Content-Language: en-US To: Tong Tiangen , Pasha Tatashin Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. Peter Anvin" , Andrew Morton , Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , LKML , linux-mm , Linux ARM , linux-riscv@lists.infradead.org, Kefeng Wang , Guohanjun References: <20220418034444.520928-1-tongtiangen@huawei.com> <20220418034444.520928-2-tongtiangen@huawei.com> <1671baf7-046e-7c52-183f-fd654125fd67@arm.com> From: Anshuman Khandual In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/21/22 08:35, Tong Tiangen wrote: > > > 在 2022/4/21 0:44, Pasha Tatashin 写道: >> On Wed, Apr 20, 2022 at 2:45 AM Tong Tiangen wrote: >>> >>> >>> >>> 在 2022/4/19 17:29, Anshuman Khandual 写道: >>>> >>>> >>>> On 4/18/22 09:14, Tong Tiangen wrote: >>>>> --- a/mm/page_table_check.c >>>>> +++ b/mm/page_table_check.c >>>>> @@ -10,6 +10,14 @@ >>>>>    #undef pr_fmt >>>>>    #define pr_fmt(fmt)        "page_table_check: " fmt >>>>> >>>>> +#ifndef PMD_PAGE_SIZE >>>>> +#define PMD_PAGE_SIZE       PMD_SIZE >>>>> +#endif >>>>> + >>>>> +#ifndef PUD_PAGE_SIZE >>>>> +#define PUD_PAGE_SIZE       PUD_SIZE >>>>> +#endif >>>> >>>> Why cannot PMD_SIZE/PUD_SIZE be used on every platform instead ? What is the >>>> need for using PUD_PAGE_SIZE/PMD_PAGE_SIZE ? Are they different on x86 ? >>>> . >>> >>> Hi, Pasha： >>> I checked the definitions of PMD_SIZE/PUD_SIZE and >>> PUD_PAGE_SIZE/PMD_PAGE_SIZE in x86 architecture and their use outside >>> the architecture(eg: in mm/, all used PMD_SIZE/PUD_SIZE), Would it be >>> better to use a unified PMD_SIZE/PUD_SIZE here? >> >> Hi Tong, >> >> Yes, it makes sense to use PMD_SIZE/PUD_SIZE instead of >> PUD_PAGE_SIZE/PMD_PAGE_SIZE in page_table_check to be inline with the >> rest of the mm/ >> >> Pasha >> > Hi Pasha and Anshuman: > > OK, Functional correctness is not affected here, i plan to optimize this point after this patchset is merged. As page table check is now being proposed to be supported on multiple platforms i.e arm64, riscv besides just x86, it should not have any architecture specific macros or functions. Hence please do generalize these PMD/PUD sizes in this series itself. 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C260FC433EF for ; Thu, 21 Apr 2022 03:44:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AHBcydym+IQBzev8GSESHFb1mP8eL/qKstD9XhuDFC8=; b=SWHUi7DO5CMmU3 nR+GEtMnfsSY8f/cKdI0isiPOjzQLu/HD62soeyXdJ91kl2AEHVtLEQEM3o0QxLJkNvuqS1Ph1emq 4jeJ+Pz2FIyONueX37l4WBb2mBcPLJ96fsK35xldcWCNiL7sQVGgo1zcjbKks0qQrpnZDt8Duu7ZI Lb3A4ZcRNLlrYxIHd2O/vTLd52lImH319BJmWJNUpcdxku0cUBTNTh4Ewco012uZsHhCBj4N8NZwM 8P4XexbwqC4pa9797CcPQ/6dfRLkmhPaQfOtPm9/IDJxCrZu7Ii3dSyYNOVWMzFh3DMmEysOOghrM cYTfbJIEoxtfxxwDHKgA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhNkF-00BLlM-N8; Thu, 21 Apr 2022 03:44:39 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nhNk4-00BLhh-1k; Thu, 21 Apr 2022 03:44:29 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5488E1477; Wed, 20 Apr 2022 20:44:23 -0700 (PDT) Received: from [192.168.225.231] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 441B93F766; Wed, 20 Apr 2022 20:44:15 -0700 (PDT) Message-ID: <75f444a6-4f50-4356-9e71-f72c59bf0a52@arm.com> Date: Thu, 21 Apr 2022 09:14:54 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH -next v4 1/4] mm: page_table_check: move pxx_user_accessible_page into x86 Content-Language: en-US To: Tong Tiangen , Pasha Tatashin Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. 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Peter Anvin" , Andrew Morton , Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , LKML , linux-mm , Linux ARM , linux-riscv@lists.infradead.org, Kefeng Wang , Guohanjun References: <20220418034444.520928-1-tongtiangen@huawei.com> <20220418034444.520928-2-tongtiangen@huawei.com> <1671baf7-046e-7c52-183f-fd654125fd67@arm.com> From: Anshuman Khandual In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220420_204428_171399_50391D75 X-CRM114-Status: GOOD ( 13.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org CgpPbiA0LzIxLzIyIDA4OjM1LCBUb25nIFRpYW5nZW4gd3JvdGU6Cj4gCj4gCj4g5ZyoIDIwMjIv NC8yMSAwOjQ0LCBQYXNoYSBUYXRhc2hpbiDlhpnpgZM6Cj4+IE9uIFdlZCwgQXByIDIwLCAyMDIy IGF0IDI6NDUgQU0gVG9uZyBUaWFuZ2VuIDx0b25ndGlhbmdlbkBodWF3ZWkuY29tPiB3cm90ZToK Pj4+Cj4+Pgo+Pj4KPj4+IOWcqCAyMDIyLzQvMTkgMTc6MjksIEFuc2h1bWFuIEtoYW5kdWFsIOWG memBkzoKPj4+Pgo+Pj4+Cj4+Pj4gT24gNC8xOC8yMiAwOToxNCwgVG9uZyBUaWFuZ2VuIHdyb3Rl Ogo+Pj4+PiAtLS0gYS9tbS9wYWdlX3RhYmxlX2NoZWNrLmMKPj4+Pj4gKysrIGIvbW0vcGFnZV90 YWJsZV9jaGVjay5jCj4+Pj4+IEBAIC0xMCw2ICsxMCwxNCBAQAo+Pj4+PiDCoMKgICN1bmRlZiBw cl9mbXQKPj4+Pj4gwqDCoCAjZGVmaW5lIHByX2ZtdChmbXQpwqDCoMKgwqDCoMKgwqAgInBhZ2Vf dGFibGVfY2hlY2s6ICIgZm10Cj4+Pj4+Cj4+Pj4+ICsjaWZuZGVmIFBNRF9QQUdFX1NJWkUKPj4+ Pj4gKyNkZWZpbmUgUE1EX1BBR0VfU0laRcKgwqDCoMKgwqDCoCBQTURfU0laRQo+Pj4+PiArI2Vu ZGlmCj4+Pj4+ICsKPj4+Pj4gKyNpZm5kZWYgUFVEX1BBR0VfU0laRQo+Pj4+PiArI2RlZmluZSBQ VURfUEFHRV9TSVpFwqDCoMKgwqDCoMKgIFBVRF9TSVpFCj4+Pj4+ICsjZW5kaWYKPj4+Pgo+Pj4+ IFdoeSBjYW5ub3QgUE1EX1NJWkUvUFVEX1NJWkUgYmUgdXNlZCBvbiBldmVyeSBwbGF0Zm9ybSBp bnN0ZWFkID8gV2hhdCBpcyB0aGUKPj4+PiBuZWVkIGZvciB1c2luZyBQVURfUEFHRV9TSVpFL1BN RF9QQUdFX1NJWkUgPyBBcmUgdGhleSBkaWZmZXJlbnQgb24geDg2ID8KPj4+PiAuCj4+Pgo+Pj4g SGksIFBhc2hh77yaCj4+PiBJIGNoZWNrZWQgdGhlIGRlZmluaXRpb25zIG9mIFBNRF9TSVpFL1BV RF9TSVpFIGFuZAo+Pj4gUFVEX1BBR0VfU0laRS9QTURfUEFHRV9TSVpFIGluIHg4NiBhcmNoaXRl Y3R1cmUgYW5kIHRoZWlyIHVzZSBvdXRzaWRlCj4+PiB0aGUgYXJjaGl0ZWN0dXJlKGVnOiBpbiBt bS8sIGFsbCB1c2VkIFBNRF9TSVpFL1BVRF9TSVpFKSwgV291bGQgaXQgYmUKPj4+IGJldHRlciB0 byB1c2UgYSB1bmlmaWVkIFBNRF9TSVpFL1BVRF9TSVpFIGhlcmU/Cj4+Cj4+IEhpIFRvbmcsCj4+ Cj4+IFllcywgaXQgbWFrZXMgc2Vuc2UgdG8gdXNlIFBNRF9TSVpFL1BVRF9TSVpFIGluc3RlYWQg b2YKPj4gUFVEX1BBR0VfU0laRS9QTURfUEFHRV9TSVpFIGluIHBhZ2VfdGFibGVfY2hlY2sgdG8g YmUgaW5saW5lIHdpdGggdGhlCj4+IHJlc3Qgb2YgdGhlIG1tLwo+Pgo+PiBQYXNoYQo+Pgo+IEhp IFBhc2hhIGFuZCBBbnNodW1hbjoKPiAKPiBPSywgRnVuY3Rpb25hbCBjb3JyZWN0bmVzcyBpcyBu b3QgYWZmZWN0ZWQgaGVyZSwgaSBwbGFuIHRvIG9wdGltaXplIHRoaXMgcG9pbnQgYWZ0ZXIgdGhp cyBwYXRjaHNldCBpcyBtZXJnZWQuCgpBcyBwYWdlIHRhYmxlIGNoZWNrIGlzIG5vdyBiZWluZyBw cm9wb3NlZCB0byBiZSBzdXBwb3J0ZWQgb24gbXVsdGlwbGUgcGxhdGZvcm1zIGkuZQphcm02NCwg cmlzY3YgYmVzaWRlcyBqdXN0IHg4NiwgaXQgc2hvdWxkIG5vdCBoYXZlIGFueSBhcmNoaXRlY3R1 cmUgc3BlY2lmaWMgbWFjcm9zCm9yIGZ1bmN0aW9ucy4gSGVuY2UgcGxlYXNlIGRvIGdlbmVyYWxp emUgdGhlc2UgUE1EL1BVRCBzaXplcyBpbiB0aGlzIHNlcmllcyBpdHNlbGYuCgpfX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1h aWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xp c3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==