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Message-Id: <1442514264-12475-1-git-send-email-toshi.kani@hpe.com> Date: Thu, 17 Sep 2015 12:24:13 -0600 From: Toshi Kani <toshi.kani@....com> To: hpa@...or.com, tglx@...utronix.de, mingo@...hat.com Cc: akpm@...ux-foundation.org, bp@...en8.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com, konrad.wilk@...cle.com, elliott@....com Subject: [PATCH v4 RESEND 0/11] x86/mm: Handle large PAT bit in pud/pmd interfaces 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 by 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 1/11-2/11 make changes necessary for patch 3/11 to use P?D_PAGE_MASK. Patch 3/11-4/11 fix pud/pmd interfaces to handle the PAT bit properly. Patch 5/11 adds p?d_pgprot() interfaces for PUD/PMD. Patch 6/11 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit properly. Patch 7/11-10/11 fix multiple functions to handle the large PAT bit properly. Patch 11/11 fixes the no-change case in try_preserve_large_page() by leveraging the changes made in patch 9/11. Note, the PAT bit is first enabled in 4.2-rc1 with WT mapping. The functions fixed by patch 7/11-10/11 are not used with WT mapping yet. These fixes will protect them from the future use of the PAT bit set. The patchset is based on the -tip branch. --- RESEND: - Rebased to 4.3-rc1 -tip branch. No conflict. v4: - Add descriptions of the issue fixed by patch 01/11 (Thomas Gleixner). - Split patch 03 into two patches, mask changes & pud/pmd interface changes. (Thomas Gleixner). v3: - Add patch 4/11 and 6/11-9/11 for multiple interfaces to handle the large PAT bit. - Add patch 11/11 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 (11): 1/11 x86/vdso32: Define PGTABLE_LEVELS to 32bit VDSO 2/11 x86/asm: Move PUD_PAGE macros to page_types.h 3/11 x86/asm: Add pud/pmd mask interfaces to handle large PAT bit 4/11 x86/asm: Fix pud/pmd interfaces to handle large PAT bit 5/11 x86/asm: Add pud_pgprot() and pmd_pgprot() 6/11 x86/mm: Fix page table dump to show PAT bit 7/11 x86/mm: Fix slow_virt_to_phys() to handle large PAT bit 8/11 x86/mm: Fix gup_huge_p?d() to handle large PAT bit 9/11 x86/mm: Fix try_preserve_large_page() to handle large PAT bit 10/11 x86/mm: Fix __split_large_page() to handle large PAT bit 11/11 x86/mm: Fix no-change case 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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