From nobody Sat Dec 27 07:08:00 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A962D3B796 for ; Fri, 22 Dec 2023 23:52:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="dDsZjT6T" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1703289148; x=1734825148; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7MgS2tz+eXb3t+LyzYLE/xkq/zAhJTq68EvRtEFLASY=; b=dDsZjT6TgC0iQHee3fQ3xec2LujX+LzK/UyK4DNuorUAqxuO9V/Vs336 ETGSZr2y6qOB7uhzDPYgaNQ9mWBg8JtFvvhK4aNH1TOKg+4HhQDTKz1R5 zeibiGvQxuAQeX8wqPN6BI9UI6PZhnTX5zCP1xq3T0w9jnSz7/KFtKfbx QC8AKBZQSDzcxLXVubqt8cyPI9/2AxaZyMLfjmg7CjtQ659qQee96ud5b XxkpAK3h/81dt3UhTAJfTm4gNsj6QFMILWvpl+1AxSISCNwpq3ZQZnPZz /9ZMoWYxTSG4UFI4+KaZ2Rbij0fR5+c7eQn0HPkK7qDk/reOwzRBJSgNp A==; X-IronPort-AV: E=McAfee;i="6600,9927,10932"; a="395063311" X-IronPort-AV: E=Sophos;i="6.04,297,1695711600"; d="scan'208";a="395063311" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Dec 2023 15:52:27 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10932"; a="900623010" X-IronPort-AV: E=Sophos;i="6.04,297,1695711600"; d="scan'208";a="900623010" Received: from jeroenke-mobl.ger.corp.intel.com (HELO box.shutemov.name) ([10.249.35.180]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Dec 2023 15:52:22 -0800 Received: by box.shutemov.name (Postfix, from userid 1000) id 2DC7510A491; Sat, 23 Dec 2023 02:52:12 +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: [PATCHv5 08/16] x86/mm: Return correct level from lookup_address() if pte is none Date: Sat, 23 Dec 2023 02:52:00 +0300 Message-ID: <20231222235209.32143-9-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231222235209.32143-1-kirill.shutemov@linux.intel.com> References: <20231222235209.32143-1-kirill.shutemov@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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