lkml.org 
[lkml]   [2017]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH PTI v3 09/10] x86/mm/64: Make a full PGD-entry size hole in the memory map
Date
This patch shrinks 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.

Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
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
\
 
 \ /
  Last update: 2017-12-12 16:59    [W:0.208 / U:1.664 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site