From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751945AbcBLVD6 (ORCPT ); Fri, 12 Feb 2016 16:03:58 -0500 Received: from mga09.intel.com ([134.134.136.24]:58349 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751149AbcBLVCk (ORCPT ); Fri, 12 Feb 2016 16:02:40 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,437,1449561600"; d="scan'208";a="914104123" Subject: [PATCH 32/33] x86, pkeys: create an x86 arch_calc_vm_prot_bits() for VMA flags To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, torvalds@linux-foundation.org, Dave Hansen , dave.hansen@linux.intel.com From: Dave Hansen Date: Fri, 12 Feb 2016 13:02:37 -0800 References: <20160212210152.9CAD15B0@viggo.jf.intel.com> In-Reply-To: <20160212210152.9CAD15B0@viggo.jf.intel.com> Message-Id: <20160212210237.CFB94AD5@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Hansen calc_vm_prot_bits() takes PROT_{READ,WRITE,EXECUTE} bits and turns them in to the vma->vm_flags/VM_* bits. We need to do a similar thing for protection keys. We take a protection key (4 bits) and encode it in to the 4 VM_PKEY_* bits. Note: this code is not new. It was simply a part of the mprotect_pkey() patch in the past. I broke it out for use in the execute-only support. Signed-off-by: Dave Hansen Reviewed-by: Thomas Gleixner --- b/arch/x86/include/uapi/asm/mman.h | 6 ++++++ 1 file changed, 6 insertions(+) diff -puN arch/x86/include/uapi/asm/mman.h~pkeys-78-arch_calc_vm_prot_bits arch/x86/include/uapi/asm/mman.h --- a/arch/x86/include/uapi/asm/mman.h~pkeys-78-arch_calc_vm_prot_bits 2016-02-12 10:44:28.418803718 -0800 +++ b/arch/x86/include/uapi/asm/mman.h 2016-02-12 10:44:28.421803855 -0800 @@ -20,6 +20,12 @@ ((vm_flags) & VM_PKEY_BIT1 ? _PAGE_PKEY_BIT1 : 0) | \ ((vm_flags) & VM_PKEY_BIT2 ? _PAGE_PKEY_BIT2 : 0) | \ ((vm_flags) & VM_PKEY_BIT3 ? _PAGE_PKEY_BIT3 : 0)) + +#define arch_calc_vm_prot_bits(prot, key) ( \ + ((key) & 0x1 ? VM_PKEY_BIT0 : 0) | \ + ((key) & 0x2 ? VM_PKEY_BIT1 : 0) | \ + ((key) & 0x4 ? VM_PKEY_BIT2 : 0) | \ + ((key) & 0x8 ? VM_PKEY_BIT3 : 0)) #endif #include _