Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933098AbcLHQ2B (ORCPT ); Thu, 8 Dec 2016 11:28:01 -0500 Received: from mga11.intel.com ([192.55.52.93]:15374 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932615AbcLHQWf (ORCPT ); Thu, 8 Dec 2016 11:22:35 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,320,1477983600"; d="scan'208";a="15485115" From: "Kirill A. Shutemov" To: Linus Torvalds , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , Arnd Bergmann , "H. Peter Anvin" Cc: Andi Kleen , Dave Hansen , Andy Lutomirski , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [RFC, PATCHv1 21/28] x86/mm: extend kasan to support 5-level paging Date: Thu, 8 Dec 2016 19:21:43 +0300 Message-Id: <20161208162150.148763-23-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: <20161208162150.148763-1-kirill.shutemov@linux.intel.com> References: <20161208162150.148763-1-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1688 Lines: 52 This patch bring support fo non-folded additional page table level. Signed-off-by: Kirill A. Shutemov --- arch/x86/mm/kasan_init_64.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 2964de48e177..e37504e94e8f 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -50,8 +50,18 @@ static void __init kasan_map_early_shadow(pgd_t *pgd) unsigned long end = KASAN_SHADOW_END; for (i = pgd_index(start); start < end; i++) { - pgd[i] = __pgd(__pa_nodebug(kasan_zero_pud) - | _KERNPG_TABLE); + switch (CONFIG_PGTABLE_LEVELS) { + case 4: + pgd[i] = __pgd(__pa_nodebug(kasan_zero_pud) | + _KERNPG_TABLE); + break; + case 5: + pgd[i] = __pgd(__pa_nodebug(kasan_zero_p4d) | + _KERNPG_TABLE); + break; + default: + BUILD_BUG(); + } start += PGDIR_SIZE; } } @@ -79,6 +89,7 @@ void __init kasan_early_init(void) pteval_t pte_val = __pa_nodebug(kasan_zero_page) | __PAGE_KERNEL; pmdval_t pmd_val = __pa_nodebug(kasan_zero_pte) | _KERNPG_TABLE; pudval_t pud_val = __pa_nodebug(kasan_zero_pmd) | _KERNPG_TABLE; + p4dval_t p4d_val = __pa_nodebug(kasan_zero_pud) | _KERNPG_TABLE; for (i = 0; i < PTRS_PER_PTE; i++) kasan_zero_pte[i] = __pte(pte_val); @@ -89,6 +100,9 @@ void __init kasan_early_init(void) for (i = 0; i < PTRS_PER_PUD; i++) kasan_zero_pud[i] = __pud(pud_val); + for (i = 0; CONFIG_PGTABLE_LEVELS >= 5 && i < PTRS_PER_P4D; i++) + kasan_zero_p4d[i] = __p4d(p4d_val); + kasan_map_early_shadow(early_level4_pgt); kasan_map_early_shadow(init_level4_pgt); } -- 2.10.2