lkml.org 
[lkml]   [2018]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 34/39] x86/ldt: Define LDT_END_ADDR
Date
From: Joerg Roedel <jroedel@suse.de>

It marks the end of the address-space range reserved for the
LDT. The LDT-code will use it when unmapping the LDT for
user-space.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/include/asm/pgtable_32_types.h | 2 ++
arch/x86/include/asm/pgtable_64_types.h | 1 +
arch/x86/kernel/ldt.c | 2 +-
3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h
index 7297810..b0bc0ff 100644
--- a/arch/x86/include/asm/pgtable_32_types.h
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -53,6 +53,8 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */
#define LDT_BASE_ADDR \
((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)

+#define LDT_END_ADDR (LDT_BASE_ADDR + PMD_SIZE)
+
#define PKMAP_BASE \
((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)

diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 066e0ab..04edd2d 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -115,6 +115,7 @@ extern unsigned int ptrs_per_p4d;
#define LDT_PGD_ENTRY_L5 -112UL
#define LDT_PGD_ENTRY (pgtable_l5_enabled() ? LDT_PGD_ENTRY_L5 : LDT_PGD_ENTRY_L4)
#define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT)
+#define LDT_END_ADDR (LDT_BASE_ADDR + PGDIR_SIZE)

#define __VMALLOC_BASE_L4 0xffffc90000000000UL
#define __VMALLOC_BASE_L5 0xffa0000000000000UL
diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index c9b1402..e921b3d 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -206,7 +206,7 @@ static void free_ldt_pgtables(struct mm_struct *mm)
#ifdef CONFIG_PAGE_TABLE_ISOLATION
struct mmu_gather tlb;
unsigned long start = LDT_BASE_ADDR;
- unsigned long end = start + (1UL << PGDIR_SHIFT);
+ unsigned long end = LDT_END_ADDR;

if (!static_cpu_has(X86_FEATURE_PTI))
return;
--
2.7.4
\
 
 \ /
  Last update: 2018-07-11 13:31    [W:0.371 / U:4.264 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site