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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C2C9E92705 for ; Thu, 5 Oct 2023 14:45:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238888AbjJEOnz (ORCPT ); Thu, 5 Oct 2023 10:43:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237218AbjJEOiu (ORCPT ); Thu, 5 Oct 2023 10:38:50 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0308C93C1 for ; Thu, 5 Oct 2023 07:04:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696514671; x=1728050671; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7MgS2tz+eXb3t+LyzYLE/xkq/zAhJTq68EvRtEFLASY=; b=KBQQ6DFCrx4+ZQd8zRMdkWnWGf4rhDeCaLqhsT/rjjgN7BJWMQek5rA9 f7MjB+0hO+QyYNGdlr54WWenJHJCslo/3dZNlX4vZ4zIaF0MNBiFqXDGJ OBuMJ9Wk3nlaZ7wkDFJcCSOcmc66P2S3ei7hdsMwRaSRvXt2dtFxO/EnB C3/hMQjpaCT+tdx/MAFtzCYelG/5qDgKmj9ES02QmRJq3xZoUQtP9kpCi Vptp0jQ/96SfnKSDRhnLXllcT4WukoyXd77AgITqnSX2aVi45Hyqlz2cf hqspXW9mvrp9TLXwRmrNdN1X+lyykRhHXJwN3AKJoiBMqHoD2DSmlaEof g==; X-IronPort-AV: E=McAfee;i="6600,9927,10854"; a="382357561" X-IronPort-AV: E=Sophos;i="6.03,203,1694761200"; d="scan'208";a="382357561" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Oct 2023 06:14:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10854"; a="817564320" X-IronPort-AV: E=Sophos;i="6.03,203,1694761200"; d="scan'208";a="817564320" Received: from skwasnia-mobl.ger.corp.intel.com (HELO box.shutemov.name) ([10.251.222.71]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Oct 2023 06:14:23 -0700 Received: by box.shutemov.name (Postfix, from userid 1000) id 52B2510A150; Thu, 5 Oct 2023 16:14:14 +0300 (+03) From: "Kirill A. Shutemov" To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Cc: "Rafael J. Wysocki" , Peter Zijlstra , Adrian Hunter , Kuppuswamy Sathyanarayanan , Elena Reshetova , Jun Nakajima , Rick Edgecombe , Tom Lendacky , kexec@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCH 07/13] x86/mm: Return correct level from lookup_address() if pte is none Date: Thu, 5 Oct 2023 16:13:56 +0300 Message-ID: <20231005131402.14611-8-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231005131402.14611-1-kirill.shutemov@linux.intel.com> References: <20231005131402.14611-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org lookup_address() only returns correct page table level for the entry if the entry is not none. Make the helper to always return correct 'level'. It allows to implement iterator over kernel page tables using lookup_address(). Add one more entry into enum pg_level to indicate size of VA covered by one PGD entry in 5-level paging mode. Signed-off-by: Kirill A. Shutemov Reviewed-by: Rick Edgecombe --- arch/x86/include/asm/pgtable_types.h | 1 + arch/x86/mm/pat/set_memory.c | 8 ++++---- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 0b748ee16b3d..3f648ffdfbe5 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -548,6 +548,7 @@ enum pg_level { PG_LEVEL_2M, PG_LEVEL_1G, PG_LEVEL_512G, + PG_LEVEL_256T, PG_LEVEL_NUM }; diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 6fbf22d5fa56..01f827eb8e80 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -666,32 +666,32 @@ pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address, pud_t *pud; pmd_t *pmd; - *level = PG_LEVEL_NONE; + *level = PG_LEVEL_256T; if (pgd_none(*pgd)) return NULL; + *level = PG_LEVEL_512G; p4d = p4d_offset(pgd, address); if (p4d_none(*p4d)) return NULL; - *level = PG_LEVEL_512G; if (p4d_large(*p4d) || !p4d_present(*p4d)) return (pte_t *)p4d; + *level = PG_LEVEL_1G; pud = pud_offset(p4d, address); if (pud_none(*pud)) return NULL; - *level = PG_LEVEL_1G; if (pud_large(*pud) || !pud_present(*pud)) return (pte_t *)pud; + *level = PG_LEVEL_2M; pmd = pmd_offset(pud, address); if (pmd_none(*pmd)) return NULL; - *level = PG_LEVEL_2M; if (pmd_large(*pmd) || !pmd_present(*pmd)) return (pte_t *)pmd; -- 2.41.0