From nobody Tue Dec 30 14:56:27 2025 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 10381C07548 for ; Wed, 15 Nov 2023 12:02:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343791AbjKOMCY (ORCPT ); Wed, 15 Nov 2023 07:02:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343711AbjKOMB4 (ORCPT ); Wed, 15 Nov 2023 07:01:56 -0500 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B943A197 for ; Wed, 15 Nov 2023 04:01:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700049691; x=1731585691; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7MgS2tz+eXb3t+LyzYLE/xkq/zAhJTq68EvRtEFLASY=; b=SBRTvS6fUy5VrPKbxaBejF+K7xljXAkIrJLWJXEb2qFTaZoLdsbQVzj2 ehgG+6UD3J35APjxTZyqKMJzHzk0WnIBqMeEBxSVtZ046No5fAZXwXEkI xK4dDcIbukFlc4KkVijm3JAttQFM5tORdofIPz8a2m3LDSmhAfW3TyRnp ShzFhV/nNKyJV6Q3dfVG9Rfw4UqnpFuK+9e3cFgAOaD7+2vT5ET3Tj87C qMf6wcUxn5d8SgTdwBYrZL6ZkzuNvxwZiVkeZQ3yW0lPkZ6xPhoQ8GQGF /I+lCWkurbREz7SH5cHD/j9Afv5T+6t+X8NCDLjB/pRj0zehezqrh1hy+ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10894"; a="12411963" X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="12411963" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2023 04:01:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,304,1694761200"; d="scan'208";a="6377702" Received: from mituomis-mobl.ger.corp.intel.com (HELO box.shutemov.name) ([10.249.44.135]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2023 04:01:21 -0800 Received: by box.shutemov.name (Postfix, from userid 1000) id 85A4210A301; Wed, 15 Nov 2023 15:01:12 +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 , "Kalra, Ashish" , Sean Christopherson , "Huang, Kai" , Baoquan He , kexec@lists.infradead.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv3 08/14] x86/mm: Return correct level from lookup_address() if pte is none Date: Wed, 15 Nov 2023 15:00:38 +0300 Message-ID: <20231115120044.8034-9-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231115120044.8034-1-kirill.shutemov@linux.intel.com> References: <20231115120044.8034-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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/pg= table_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 }; =20 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 lon= g address, pud_t *pud; pmd_t *pmd; =20 - *level =3D PG_LEVEL_NONE; + *level =3D PG_LEVEL_256T; =20 if (pgd_none(*pgd)) return NULL; =20 + *level =3D PG_LEVEL_512G; p4d =3D p4d_offset(pgd, address); if (p4d_none(*p4d)) return NULL; =20 - *level =3D PG_LEVEL_512G; if (p4d_large(*p4d) || !p4d_present(*p4d)) return (pte_t *)p4d; =20 + *level =3D PG_LEVEL_1G; pud =3D pud_offset(p4d, address); if (pud_none(*pud)) return NULL; =20 - *level =3D PG_LEVEL_1G; if (pud_large(*pud) || !pud_present(*pud)) return (pte_t *)pud; =20 + *level =3D PG_LEVEL_2M; pmd =3D pmd_offset(pud, address); if (pmd_none(*pmd)) return NULL; =20 - *level =3D PG_LEVEL_2M; if (pmd_large(*pmd) || !pmd_present(*pmd)) return (pte_t *)pmd; =20 --=20 2.41.0