Messages in this thread Patch in this message | | | Date | Sat, 16 Dec 2017 22:24:31 +0100 | From | Thomas Gleixner <> | Subject | [patch V149 37/50] x86/mm/64: Make a full PGD-entry size hole in the memory map |
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From: Andy Lutomirski <luto@kernel.org>
Shrink vmalloc space from 16384TiB to 12800TiB to enlarge the hole starting at 0xff90000000000000 to be a full PGD entry.
A subsequent patch will use this hole for the pagetable isolation LDT alias.
Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Kees Cook <keescook@chromium.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: David Laight <David.Laight@aculab.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
--- Documentation/x86/x86_64/mm.txt | 4 ++-- arch/x86/include/asm/pgtable_64_types.h | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt index 63a41671d25b..6a28aeaccd53 100644 --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -28,8 +28,8 @@ Virtual memory map with 5 level page tables: hole caused by [56:63] sign extension ff00000000000000 - ff0fffffffffffff (=52 bits) guard hole, reserved for hypervisor ff10000000000000 - ff8fffffffffffff (=55 bits) direct mapping of all phys. memory -ff90000000000000 - ff91ffffffffffff (=49 bits) hole -ff92000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space +ff90000000000000 - ff9fffffffffffff (=52 bits) hole +ffa0000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space ffd2000000000000 - ffd3ffffffffffff (=49 bits) hole ffd4000000000000 - ffd5ffffffffffff (=49 bits) virtual memory map (512TB) ... unused hole ... diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h index 6d5f45dcd4a1..6e2f50843c7d 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -78,8 +78,8 @@ typedef struct { pteval_t pte; } pte_t; /* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */ #define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL) #ifdef CONFIG_X86_5LEVEL -#define VMALLOC_SIZE_TB _AC(16384, UL) -#define __VMALLOC_BASE _AC(0xff92000000000000, UL) +#define VMALLOC_SIZE_TB _AC(12800, UL) +#define __VMALLOC_BASE _AC(0xffa0000000000000, UL) #define __VMEMMAP_BASE _AC(0xffd4000000000000, UL) #else #define VMALLOC_SIZE_TB _AC(32, UL) -- 2.13.6
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