From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id B64396B025F for ; Thu, 20 Jul 2017 02:42:59 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id d18so21184975pfe.8 for ; Wed, 19 Jul 2017 23:42:59 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com. [148.163.156.1]) by mx.google.com with ESMTPS id b8si1197959pgr.457.2017.07.19.23.42.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Jul 2017 23:42:58 -0700 (PDT) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v6K6gpSa093008 for ; Thu, 20 Jul 2017 02:42:58 -0400 Received: from e23smtp02.au.ibm.com (e23smtp02.au.ibm.com [202.81.31.144]) by mx0a-001b2d01.pphosted.com with ESMTP id 2btp4ju0cx-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 20 Jul 2017 02:42:58 -0400 Received: from localhost by e23smtp02.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 20 Jul 2017 16:42:55 +1000 Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v6K6gqsr27000844 for ; Thu, 20 Jul 2017 16:42:52 +1000 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v6K6ghMb028156 for ; Thu, 20 Jul 2017 16:42:44 +1000 From: "Aneesh Kumar K.V" Subject: Re: [RFC v6 27/62] powerpc: helper to validate key-access permissions of a pte In-Reply-To: <1500177424-13695-28-git-send-email-linuxram@us.ibm.com> References: <1500177424-13695-1-git-send-email-linuxram@us.ibm.com> <1500177424-13695-28-git-send-email-linuxram@us.ibm.com> Date: Thu, 20 Jul 2017 12:12:47 +0530 MIME-Version: 1.0 Content-Type: text/plain Message-Id: <87mv7zpq1k.fsf@skywalker.in.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Ram Pai , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com, bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org, corbet@lwn.net, mingo@redhat.com, mhocko@kernel.org Ram Pai writes: > helper function that checks if the read/write/execute is allowed > on the pte. > > Signed-off-by: Ram Pai > --- > arch/powerpc/include/asm/book3s/64/pgtable.h | 4 +++ > arch/powerpc/include/asm/pkeys.h | 12 +++++++++ > arch/powerpc/mm/pkeys.c | 33 ++++++++++++++++++++++++++ > 3 files changed, 49 insertions(+), 0 deletions(-) > > diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h > index 30d7f55..0056e58 100644 > --- a/arch/powerpc/include/asm/book3s/64/pgtable.h > +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h > @@ -472,6 +472,10 @@ static inline void write_uamor(u64 value) > mtspr(SPRN_UAMOR, value); > } > > +#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS > +extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute); > +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ > + > #define __HAVE_ARCH_PTEP_GET_AND_CLEAR > static inline pte_t ptep_get_and_clear(struct mm_struct *mm, > unsigned long addr, pte_t *ptep) > diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h > index bbb5d85..7a9aade 100644 > --- a/arch/powerpc/include/asm/pkeys.h > +++ b/arch/powerpc/include/asm/pkeys.h > @@ -53,6 +53,18 @@ static inline u64 pte_to_hpte_pkey_bits(u64 pteflags) > ((pteflags & H_PAGE_PKEY_BIT4) ? HPTE_R_KEY_BIT4 : 0x0UL)); > } > > +static inline u16 pte_to_pkey_bits(u64 pteflags) > +{ > + if (!pkey_inited) > + return 0x0UL; Do we really need that above check ? We should always find it peky_inited to be set. > + > + return (((pteflags & H_PAGE_PKEY_BIT0) ? 0x10 : 0x0UL) | > + ((pteflags & H_PAGE_PKEY_BIT1) ? 0x8 : 0x0UL) | > + ((pteflags & H_PAGE_PKEY_BIT2) ? 0x4 : 0x0UL) | > + ((pteflags & H_PAGE_PKEY_BIT3) ? 0x2 : 0x0UL) | > + ((pteflags & H_PAGE_PKEY_BIT4) ? 0x1 : 0x0UL)); > +} > + -aneesh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org