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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, 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 89873C43381 for ; Thu, 14 Feb 2019 00:03:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4F60B218FF for ; Thu, 14 Feb 2019 00:03:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="2PAnanOt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404368AbfBNADw (ORCPT ); Wed, 13 Feb 2019 19:03:52 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:56924 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393416AbfBNADm (ORCPT ); Wed, 13 Feb 2019 19:03:42 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x1DNx9xx093658; Thu, 14 Feb 2019 00:02:20 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 : in-reply-to : references; s=corp-2018-07-02; bh=TQlIsuP1ag8N8cWtIZarXg5qzwt4o6eHPtANA79RWaM=; b=2PAnanOtADcxei1cy8BlTb/qU5ZZ7i0wqibFXPa9bnInPG/bvReURBWdV7oqlHHKB04P eJe2e67nu+luxcdvC3UBRDtvbK4t0fpRO4v+csDCFP/QjO2HMEGx/ANYI0/HgjyJOXBQ A+HhQpvU1Zm+os48RbnhGhjXf13nrybGW9Q+s+JqmKbNdQ6NQ9nWd7faph98x/U5WFsQ GP3HR7Iu2pYrMuqLFfE3A+sddb/2CPIRd3PP80otI32ENy8xTiH9Z0CLXt9neXDuvRjw swjC9f3y4oeNAID085G4bmwvjmiQzHs2QY3PeVUXmX6gdeHyJcTl0BfB9Kn9iJyjhaP4 ZQ== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2qhrekn4kv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Feb 2019 00:02:20 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x1E02I6f026212 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Feb 2019 00:02:19 GMT Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x1E02Hqw032540; Thu, 14 Feb 2019 00:02:17 GMT Received: from concerto.internal (/24.9.64.241) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 13 Feb 2019 16:02:16 -0800 From: Khalid Aziz To: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de, ak@linux.intel.com, torvalds@linux-foundation.org, liran.alon@oracle.com, keescook@google.com, akpm@linux-foundation.org, mhocko@suse.com, catalin.marinas@arm.com, will.deacon@arm.com, jmorris@namei.org, konrad.wilk@oracle.com Cc: Tycho Andersen , deepa.srinivasan@oracle.com, chris.hyser@oracle.com, tyhicks@canonical.com, dwmw@amazon.co.uk, andrew.cooper3@citrix.com, jcm@redhat.com, boris.ostrovsky@oracle.com, kanth.ghatraju@oracle.com, oao.m.martins@oracle.com, jmattson@google.com, pradeep.vincent@oracle.com, john.haxby@oracle.com, tglx@linutronix.de, kirill.shutemov@linux.intel.com, hch@lst.de, steven.sistare@oracle.com, labbott@redhat.com, luto@kernel.org, dave.hansen@intel.com, peterz@infradead.org, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Khalid Aziz Subject: [RFC PATCH v8 09/14] mm: add a user_virt_to_phys symbol Date: Wed, 13 Feb 2019 17:01:32 -0700 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9166 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902130157 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tycho Andersen We need someting like this for testing XPFO. Since it's architecture specific, putting it in the test code is slightly awkward, so let's make it an arch-specific symbol and export it for use in LKDTM. CC: linux-arm-kernel@lists.infradead.org CC: x86@kernel.org Signed-off-by: Tycho Andersen Tested-by: Marco Benatto Signed-off-by: Khalid Aziz --- v6: * add a definition of user_virt_to_phys in the !CONFIG_XPFO case v7: * make user_virt_to_phys a GPL symbol arch/x86/mm/xpfo.c | 57 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/xpfo.h | 8 +++++++ 2 files changed, 65 insertions(+) diff --git a/arch/x86/mm/xpfo.c b/arch/x86/mm/xpfo.c index 6c7502993351..e13b99019c47 100644 --- a/arch/x86/mm/xpfo.c +++ b/arch/x86/mm/xpfo.c @@ -117,3 +117,60 @@ inline void xpfo_flush_kernel_tlb(struct page *page, int order) flush_tlb_kernel_range(kaddr, kaddr + (1 << order) * size); } + +/* Convert a user space virtual address to a physical address. + * Shamelessly copied from slow_virt_to_phys() and lookup_address() in + * arch/x86/mm/pageattr.c + */ +phys_addr_t user_virt_to_phys(unsigned long addr) +{ + phys_addr_t phys_addr; + unsigned long offset; + pgd_t *pgd; + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + + pgd = pgd_offset(current->mm, addr); + if (pgd_none(*pgd)) + return 0; + + p4d = p4d_offset(pgd, addr); + if (p4d_none(*p4d)) + return 0; + + if (p4d_large(*p4d) || !p4d_present(*p4d)) { + phys_addr = (unsigned long)p4d_pfn(*p4d) << PAGE_SHIFT; + offset = addr & ~P4D_MASK; + goto out; + } + + pud = pud_offset(p4d, addr); + if (pud_none(*pud)) + return 0; + + if (pud_large(*pud) || !pud_present(*pud)) { + phys_addr = (unsigned long)pud_pfn(*pud) << PAGE_SHIFT; + offset = addr & ~PUD_MASK; + goto out; + } + + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + return 0; + + if (pmd_large(*pmd) || !pmd_present(*pmd)) { + phys_addr = (unsigned long)pmd_pfn(*pmd) << PAGE_SHIFT; + offset = addr & ~PMD_MASK; + goto out; + } + + pte = pte_offset_kernel(pmd, addr); + phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT; + offset = addr & ~PAGE_MASK; + +out: + return (phys_addr_t)(phys_addr | offset); +} +EXPORT_SYMBOL_GPL(user_virt_to_phys); diff --git a/include/linux/xpfo.h b/include/linux/xpfo.h index 8b029918a958..117869991d5b 100644 --- a/include/linux/xpfo.h +++ b/include/linux/xpfo.h @@ -24,6 +24,10 @@ struct page; #ifdef CONFIG_XPFO +#include + +#include + extern struct page_ext_operations page_xpfo_ops; void set_kpte(void *kaddr, struct page *page, pgprot_t prot); @@ -49,6 +53,8 @@ void xpfo_temp_unmap(const void *addr, size_t size, void **mapping, bool xpfo_enabled(void); +phys_addr_t user_virt_to_phys(unsigned long addr); + #else /* !CONFIG_XPFO */ static inline void xpfo_kmap(void *kaddr, struct page *page) { } @@ -73,6 +79,8 @@ static inline void xpfo_temp_unmap(const void *addr, size_t size, static inline bool xpfo_enabled(void) { return false; } +static inline phys_addr_t user_virt_to_phys(unsigned long addr) { return 0; } + #endif /* CONFIG_XPFO */ #endif /* _LINUX_XPFO_H */ -- 2.17.1