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=-12.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_GIT 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 BB76BC2D0A3 for ; Mon, 9 Nov 2020 14:45:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 587392074F for ; Mon, 9 Nov 2020 14:45:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="hLnG20WP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730058AbgKIOp0 (ORCPT ); Mon, 9 Nov 2020 09:45:26 -0500 Received: from aserp2120.oracle.com ([141.146.126.78]:49378 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729706AbgKIOp0 (ORCPT ); Mon, 9 Nov 2020 09:45:26 -0500 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0A9EhsB4194699; Mon, 9 Nov 2020 14:45:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=AJUnYl9q2aFNqQHIPc035IxF21kJkzcWxb0zMqd1WJ4=; b=hLnG20WPec9zou2miRkoQr7w0u/ilagZJ64AvL5VzJgfPJCUzj1zcTDaQNENqIFEuyO3 B/vPc6Fw9k+LcV2wUnoMLHeEL77nwXx0uSL/wdSOmXAFtwV/JOSMYn9cvcgryEACWX33 K49RYPp968QMju2vQlUHsHXyfjqJRIxspFYa8e2cNrhR98wAk4Taj8DpccvayloaJGvA FSpV8IH6FzB/PV0pm8FGF3rQUubXbnlHIXr+wl/c2O3Dp+fjobfdo9xthJY9t0NwyZsV PXMfXzoEnk5+zys7MpcO1M6o3cUphpdbD8FnTkzswdhtzBSY1J6pYqC6o4fM1Qz/R0US PA== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2120.oracle.com with ESMTP id 34nkhkp84p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 09 Nov 2020 14:45:07 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0A9Ef1T2138978; Mon, 9 Nov 2020 14:43:06 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 34p5bqkakt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 09 Nov 2020 14:43:06 +0000 Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0A9Eh5CN013312; Mon, 9 Nov 2020 14:43:05 GMT Received: from linux.nl.oracle.com (/10.175.27.128) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 09 Nov 2020 06:43:03 -0800 From: Alexandre Chartre To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, thomas.lendacky@amd.com, jroedel@suse.de Cc: konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, junaids@google.com, oweisse@google.com, rppt@linux.vnet.ibm.com, graf@amazon.de, mgross@linux.intel.com, kuzuno@gmail.com, alexandre.chartre@oracle.com Subject: [RFC][PATCH 11/24] x86/pti: Function to clone page-table entries from a specified mm Date: Mon, 9 Nov 2020 15:44:12 +0100 Message-Id: <20201109144425.270789-12-alexandre.chartre@oracle.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20201109144425.270789-1-alexandre.chartre@oracle.com> References: <20201109144425.270789-1-alexandre.chartre@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9799 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 phishscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011090103 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9799 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 priorityscore=1501 mlxscore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 spamscore=0 malwarescore=0 adultscore=0 clxscore=1015 bulkscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011090103 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PTI has a function to clone page-table entries but only from the init_mm page-table. Provide a new function to clone page-table entries from a specified mm page-table. Signed-off-by: Alexandre Chartre --- arch/x86/include/asm/pti.h | 10 ++++++++++ arch/x86/mm/pti.c | 32 ++++++++++++++++---------------- 2 files changed, 26 insertions(+), 16 deletions(-) diff --git a/arch/x86/include/asm/pti.h b/arch/x86/include/asm/pti.h index 07375b476c4f..5484e69ff8d3 100644 --- a/arch/x86/include/asm/pti.h +++ b/arch/x86/include/asm/pti.h @@ -4,9 +4,19 @@ #ifndef __ASSEMBLY__ #ifdef CONFIG_PAGE_TABLE_ISOLATION + +enum pti_clone_level { + PTI_CLONE_PMD, + PTI_CLONE_PTE, +}; + +struct mm_struct; + extern void pti_init(void); extern void pti_check_boottime_disable(void); extern void pti_finalize(void); +extern void pti_clone_pgtable(struct mm_struct *mm, unsigned long start, + unsigned long end, enum pti_clone_level level); #else static inline void pti_check_boottime_disable(void) { } #endif diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c index 1aab92930569..ebc8cd2f1cd8 100644 --- a/arch/x86/mm/pti.c +++ b/arch/x86/mm/pti.c @@ -294,14 +294,8 @@ static void __init pti_setup_vsyscall(void) static void __init pti_setup_vsyscall(void) { } #endif -enum pti_clone_level { - PTI_CLONE_PMD, - PTI_CLONE_PTE, -}; - -static void -pti_clone_pgtable(unsigned long start, unsigned long end, - enum pti_clone_level level) +void pti_clone_pgtable(struct mm_struct *mm, unsigned long start, + unsigned long end, enum pti_clone_level level) { unsigned long addr; @@ -320,7 +314,7 @@ pti_clone_pgtable(unsigned long start, unsigned long end, if (addr < start) break; - pgd = pgd_offset_k(addr); + pgd = pgd_offset(mm, addr); if (WARN_ON(pgd_none(*pgd))) return; p4d = p4d_offset(pgd, addr); @@ -409,6 +403,12 @@ pti_clone_pgtable(unsigned long start, unsigned long end, } } +static void pti_clone_init_pgtable(unsigned long start, unsigned long end, + enum pti_clone_level level) +{ + pti_clone_pgtable(&init_mm, start, end, level); +} + #ifdef CONFIG_X86_64 /* * Clone a single p4d (i.e. a top-level entry on 4-level systems and a @@ -476,7 +476,7 @@ static void __init pti_clone_user_shared(void) start = CPU_ENTRY_AREA_BASE; end = start + (PAGE_SIZE * CPU_ENTRY_AREA_PAGES); - pti_clone_pgtable(start, end, PTI_CLONE_PMD); + pti_clone_init_pgtable(start, end, PTI_CLONE_PMD); } #endif /* CONFIG_X86_64 */ @@ -495,9 +495,9 @@ static void __init pti_setup_espfix64(void) */ static void pti_clone_entry_text(void) { - pti_clone_pgtable((unsigned long) __entry_text_start, - (unsigned long) __entry_text_end, - PTI_CLONE_PMD); + pti_clone_init_pgtable((unsigned long) __entry_text_start, + (unsigned long) __entry_text_end, + PTI_CLONE_PMD); } /* @@ -572,11 +572,11 @@ static void pti_clone_kernel_text(void) * pti_set_kernel_image_nonglobal() did to clear the * global bit. */ - pti_clone_pgtable(start, end_clone, PTI_LEVEL_KERNEL_IMAGE); + pti_clone_init_pgtable(start, end_clone, PTI_LEVEL_KERNEL_IMAGE); /* - * pti_clone_pgtable() will set the global bit in any PMDs - * that it clones, but we also need to get any PTEs in + * pti_clone_init_pgtable() will set the global bit in any + * PMDs that it clones, but we also need to get any PTEs in * the last level for areas that are not huge-page-aligned. */ -- 2.18.4