From eedb92abb9bb03ef21442614a6f5867eaac6e77f Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Wed, 14 Feb 2018 14:16:50 +0300 Subject: x86/mm: Make virtual memory layout dynamic for CONFIG_X86_5LEVEL=y We need to be able to adjust virtual memory layout at runtime to be able to switch between 4- and 5-level paging at boot-time. KASLR already has movable __VMALLOC_BASE, __VMEMMAP_BASE and __PAGE_OFFSET. Let's re-use it. Signed-off-by: Kirill A. Shutemov Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180214111656.88514-4-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/kaslr.h | 4 ---- arch/x86/include/asm/page_64.h | 4 ++++ arch/x86/include/asm/page_64_types.h | 4 ++-- arch/x86/include/asm/pgtable_64_types.h | 4 ++-- 4 files changed, 8 insertions(+), 8 deletions(-) (limited to 'arch/x86/include/asm') diff --git a/arch/x86/include/asm/kaslr.h b/arch/x86/include/asm/kaslr.h index 460991e3b529..db7ba2feb947 100644 --- a/arch/x86/include/asm/kaslr.h +++ b/arch/x86/include/asm/kaslr.h @@ -5,10 +5,6 @@ unsigned long kaslr_get_random_long(const char *purpose); #ifdef CONFIG_RANDOMIZE_MEMORY -extern unsigned long page_offset_base; -extern unsigned long vmalloc_base; -extern unsigned long vmemmap_base; - void kernel_randomize_memory(void); #else static inline void kernel_randomize_memory(void) { } diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h index 4baa6bceb232..096378650142 100644 --- a/arch/x86/include/asm/page_64.h +++ b/arch/x86/include/asm/page_64.h @@ -11,6 +11,10 @@ extern unsigned long max_pfn; extern unsigned long phys_base; +extern unsigned long page_offset_base; +extern unsigned long vmalloc_base; +extern unsigned long vmemmap_base; + static inline unsigned long __phys_addr_nodebug(unsigned long x) { unsigned long y = x - __START_KERNEL_map; diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h index f68e6526891d..d54a3d5b5b3b 100644 --- a/arch/x86/include/asm/page_64_types.h +++ b/arch/x86/include/asm/page_64_types.h @@ -43,11 +43,11 @@ #define __PAGE_OFFSET_BASE _AC(0xffff880000000000, UL) #endif -#ifdef CONFIG_RANDOMIZE_MEMORY +#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT #define __PAGE_OFFSET page_offset_base #else #define __PAGE_OFFSET __PAGE_OFFSET_BASE -#endif /* CONFIG_RANDOMIZE_MEMORY */ +#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ #define __START_KERNEL_map _AC(0xffffffff80000000, UL) diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h index 7168de7d34eb..a0db91ab63b8 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -100,13 +100,13 @@ typedef struct { pteval_t pte; } pte_t; # define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT) #endif -#ifdef CONFIG_RANDOMIZE_MEMORY +#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT # define VMALLOC_START vmalloc_base # define VMEMMAP_START vmemmap_base #else # define VMALLOC_START __VMALLOC_BASE # define VMEMMAP_START __VMEMMAP_BASE -#endif /* CONFIG_RANDOMIZE_MEMORY */ +#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ #define VMALLOC_END (VMALLOC_START + _AC((VMALLOC_SIZE_TB << 40) - 1, UL)) -- cgit v1.2.3