From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752960AbeCEQ2Y (ORCPT ); Mon, 5 Mar 2018 11:28:24 -0500 Received: from mga17.intel.com ([192.55.52.151]:37468 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752618AbeCEQ0a (ORCPT ); Mon, 5 Mar 2018 11:26:30 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,427,1515484800"; d="scan'208";a="35620828" From: "Kirill A. Shutemov" To: Ingo Molnar , x86@kernel.org, Thomas Gleixner , "H. Peter Anvin" , Tom Lendacky Cc: Dave Hansen , Kai Huang , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Subject: [RFC, PATCH 17/22] x86/mm: Implement vma_is_encrypted() and vma_keyid() Date: Mon, 5 Mar 2018 19:26:05 +0300 Message-Id: <20180305162610.37510-18-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180305162610.37510-1-kirill.shutemov@linux.intel.com> References: <20180305162610.37510-1-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We store KeyID in upper bits for vm_page_prot that match position of KeyID in PTE. vma_keyid() extracts KeyID from vm_page_prot. VMA is encrypted if KeyID is non-zero. vma_is_encrypted() checks that. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/mktme.h | 9 +++++++++ arch/x86/mm/mktme.c | 17 +++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h index df31876ec48c..08f613953207 100644 --- a/arch/x86/include/asm/mktme.h +++ b/arch/x86/include/asm/mktme.h @@ -3,10 +3,19 @@ #include +struct vm_area_struct; + #ifdef CONFIG_X86_INTEL_MKTME extern phys_addr_t mktme_keyid_mask; extern int mktme_nr_keyids; extern int mktme_keyid_shift; + +#define vma_is_encrypted vma_is_encrypted +bool vma_is_encrypted(struct vm_area_struct *vma); + +#define vma_keyid vma_keyid +int vma_keyid(struct vm_area_struct *vma); + #else #define mktme_keyid_mask ((phys_addr_t)0) #define mktme_nr_keyids 0 diff --git a/arch/x86/mm/mktme.c b/arch/x86/mm/mktme.c index 467f1b26c737..3b2f28a21d99 100644 --- a/arch/x86/mm/mktme.c +++ b/arch/x86/mm/mktme.c @@ -1,5 +1,22 @@ +#include #include phys_addr_t mktme_keyid_mask; int mktme_nr_keyids; int mktme_keyid_shift; + +bool vma_is_encrypted(struct vm_area_struct *vma) +{ + return pgprot_val(vma->vm_page_prot) & mktme_keyid_mask; +} + +int vma_keyid(struct vm_area_struct *vma) +{ + pgprotval_t prot; + + if (!vma_is_anonymous(vma)) + return 0; + + prot = pgprot_val(vma->vm_page_prot); + return (prot & mktme_keyid_mask) >> mktme_keyid_shift; +} -- 2.16.1