From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f171.google.com (mail-ob0-f171.google.com [209.85.214.171]) by kanga.kvack.org (Postfix) with ESMTP id 4798E6B0255 for ; Wed, 5 Aug 2015 17:45:21 -0400 (EDT) Received: by obdeg2 with SMTP id eg2so42081522obd.0 for ; Wed, 05 Aug 2015 14:45:21 -0700 (PDT) Received: from g2t2352.austin.hp.com (g2t2352.austin.hp.com. [15.217.128.51]) by mx.google.com with ESMTPS id j82si2981590oig.140.2015.08.05.14.45.20 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Aug 2015 14:45:20 -0700 (PDT) From: Toshi Kani Subject: [PATCH v3 0/10] x86/mm: Handle large PAT bit in pud/pmd interfaces Date: Wed, 5 Aug 2015 15:43:23 -0600 Message-Id: <1438811013-30983-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com Cc: akpm@linux-foundation.org, bp@alien8.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, jgross@suse.com, konrad.wilk@oracle.com, elliott@hp.com The PAT bit gets relocated to bit 12 when PUD/PMD mappings are used. This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently used for masking pfn and flags for all levels. This patch-set updates pud/pmd interfaces and multiple functions to handle the large PAT bit properly. Patch 1/10-2/10 make changes necessary for patch 3/10 to use P?D_PAGE_MASK. Patch 3/10 fixes pud/pmd interfaces to handle the PAT bit properly, and patch 4/10 adds p?d_pgprot() interfaces for PUD/PMD. Patch 5/10 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit properly. Patch 6/10-9/10 fix multiple functions to handle the large PAT bit properly. Patch 10/10 fix the same pgprot handling in try_preserve_large_page() by leveraging the changes made in patch 8/10. Note, the PAT bit is first enabled in 4.2-rc1 with WT mappings. The functions fixed by patch 6/10-9/10 are not used with WT mappings yet. These fixes will protect them from future use with the PAT bit set. --- v3: - Add patch 4/10 and 6/10-9/10 for multiple interfaces to handle the large PAT bit. - Add patch 10/10 to fix the same pgprot handling in try_preserve_large_page(). v2: - Change p?n_pfn() to handle the PAT bit. (Juergen Gross) - Mask pfn and flags with P?D_PAGE_MASK. (Juergen Gross) - Change p?d_page_vaddr() and p?d_page() to handle the PAT bit. --- Toshi Kani (10): 1/10 x86/vdso32: Define PGTABLE_LEVELS to 32bit VDSO 2/10 x86/asm: Move PUD_PAGE macros to page_types.h 3/10 x86/asm: Fix pud/pmd interfaces to handle large PAT bit 4/10 x86/asm: Add pud_pgprot() and pmd_pgprot() 5/10 x86/mm: Fix page table dump to show PAT bit 6/10 x86/mm: Fix slow_virt_to_phys() to handle large PAT bit 7/10 x86/mm: Fix gup_huge_p?d() to handle large PAT bit 8/10 x86/mm: Fix try_preserve_large_page() to handle large PAT bit 9/10 x86/mm: Fix __split_large_page() to handle large PAT bit 10/10 x86/mm: Fix the same pgprot handling in try_preserve_large_page() --- arch/x86/entry/vdso/vdso32/vclock_gettime.c | 2 + arch/x86/include/asm/page_64_types.h | 3 -- arch/x86/include/asm/page_types.h | 3 ++ arch/x86/include/asm/pgtable.h | 18 ++++--- arch/x86/include/asm/pgtable_types.h | 40 +++++++++++++-- arch/x86/mm/dump_pagetables.c | 39 +++++++------- arch/x86/mm/gup.c | 18 +++---- arch/x86/mm/pageattr.c | 79 ++++++++++++++++++----------- 8 files changed, 131 insertions(+), 71 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org