linux-kernel - [PATCH v4 RESEND 0/11] x86/mm: Handle large PAT bit in pud/pmd interfaces

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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(-)

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