Commit-ID: 5c7919bb1994f8dc7fed219a5db09e6bb9d473a5 Gitweb: https://git.kernel.org/tip/5c7919bb1994f8dc7fed219a5db09e6bb9d473a5 Author: Kirill A. Shutemov <kirill.shute...@linux.intel.com> AuthorDate: Wed, 14 Feb 2018 14:16:52 +0300 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Wed, 14 Feb 2018 13:11:14 +0100
x86/mm: Make LDT_BASE_ADDR dynamic LDT_BASE_ADDR has different value in 4- and 5-level paging configurations. We need to make it dynamic in preparation for boot-time switching between paging modes. Signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Borislav Petkov <b...@suse.de> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: linux...@kvack.org Link: http://lkml.kernel.org/r/20180214111656.88514-6-kirill.shute...@linux.intel.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/include/asm/pgtable_64_types.h | 9 +++++---- arch/x86/mm/dump_pagetables.c | 5 ++++- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h index 5e2d724..903e4d05 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -92,18 +92,19 @@ extern unsigned int pgtable_l5_enabled; */ #define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL) +#define LDT_PGD_ENTRY_L4 -3UL +#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) + #ifdef CONFIG_X86_5LEVEL # define VMALLOC_SIZE_TB _AC(12800, UL) # define __VMALLOC_BASE _AC(0xffa0000000000000, UL) # define __VMEMMAP_BASE _AC(0xffd4000000000000, UL) -# define LDT_PGD_ENTRY _AC(-112, UL) -# define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT) #else # define VMALLOC_SIZE_TB _AC(32, UL) # define __VMALLOC_BASE _AC(0xffffc90000000000, UL) # define __VMEMMAP_BASE _AC(0xffffea0000000000, UL) -# define LDT_PGD_ENTRY _AC(-3, UL) -# define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT) #endif #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c index 2a4849e..a89f2db 100644 --- a/arch/x86/mm/dump_pagetables.c +++ b/arch/x86/mm/dump_pagetables.c @@ -89,7 +89,7 @@ static struct addr_marker address_markers[] = { [KASAN_SHADOW_END_NR] = { KASAN_SHADOW_END, "KASAN shadow end" }, #endif #ifdef CONFIG_MODIFY_LDT_SYSCALL - [LDT_NR] = { LDT_BASE_ADDR, "LDT remap" }, + [LDT_NR] = { 0UL, "LDT remap" }, #endif [CPU_ENTRY_AREA_NR] = { CPU_ENTRY_AREA_BASE,"CPU entry Area" }, #ifdef CONFIG_X86_ESPFIX64 @@ -570,6 +570,9 @@ static int __init pt_dump_init(void) address_markers[LOW_KERNEL_NR].start_address = PAGE_OFFSET; address_markers[VMALLOC_START_NR].start_address = VMALLOC_START; address_markers[VMEMMAP_START_NR].start_address = VMEMMAP_START; +#ifdef CONFIG_MODIFY_LDT_SYSCALL + address_markers[LDT_NR].start_address = LDT_BASE_ADDR; +#endif #endif #ifdef CONFIG_X86_32 address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
