This patchset enhances MTRR checks for the kernel huge I/O mapping. The following functional changes are made in patch 6/6. - Allow pud_set_huge() and pmd_set_huge() to create a huge page mapping when the range is covered by a single MTRR entry of any memory type. - Log a pr_warn_once() message when a specified PMD map range spans more than a single MTRR entry. Drivers should make a mapping request aligned to a single MTRR entry when the range is covered by MTRRs. Patch 1/6 simplifies the condition of HAVE_ARCH_HUGE_VMAP in Kconfig. Patch 2/6 - 5/6 are bug fix and clean up to mtrr_type_lookup(). The patchset is based on the tip tree. --- v5: - Separate Kconfig change and reordered/squashed the patchset. (Borislav Petkov) - Update logs, comments and functional structures. (Borislav Petkov) - Move MTRR_STATE_MTRR_XXX definitions to kernel asm/mtrr.h. (Borislav Petkov) - Change mtrr_type_lookup() not to set 'uniform' in case of MTRR_TYPE_INVALID. (Borislav Petkov) - Remove a patch accepted in the tip free from the series. v4: - Update the change logs of patchset. (Ingo Molnar) - Add patch 3/7 to make the wrong address fix as a separate patch. (Ingo Molnar) - Add patch 5/7 to define MTRR_TYPE_INVALID. (Ingo Molnar) - Update patch 6/7 to document MTRR fixed ranges. (Ingo Molnar) v3: - Add patch 3/5 to fix a bug in MTRR state checks. - Update patch 4/5 to create separate functions for the fixed and variable entries. (Ingo Molnar) v2: - Update change logs and comments per review comments. (Ingo Molnar) - Add patch 3/4 to clean up mtrr_type_lookup(). (Ingo Molnar) --- Toshi Kani (6): 1/6 mm, x86: Simplify conditions of HAVE_ARCH_HUGE_VMAP 2/6 mtrr, x86: Fix MTRR lookup to handle inclusive entry 3/6 mtrr, x86: Fix MTRR state checks in mtrr_type_lookup() 4/6 mtrr, x86: Define MTRR_TYPE_INVALID for mtrr_type_lookup() 5/6 mtrr, x86: Clean up mtrr_type_lookup() 6/6 mtrr, mm, x86: Enhance MTRR checks for KVA huge page mapping --- arch/x86/Kconfig | 2 +- arch/x86/include/asm/mtrr.h | 10 +- arch/x86/include/uapi/asm/mtrr.h | 8 +- arch/x86/kernel/cpu/mtrr/cleanup.c | 3 +- arch/x86/kernel/cpu/mtrr/generic.c | 200 ++++++++++++++++++++++++------------- arch/x86/mm/pat.c | 4 +- arch/x86/mm/pgtable.c | 59 ++++++++--- 7 files changed, 194 insertions(+), 92 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>