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Date: Mon, 18 Sep 2017 13:55:41 +0300 From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> To: Ingo Molnar <mingo@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net>, Cyrill Gorcunov <gorcunov@...nvz.org>, Borislav Petkov <bp@...e.de>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Subject: [PATCHv7 07/19] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL 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 <kirill.shutemov@...ux.intel.com> --- arch/x86/include/asm/kaslr.h | 4 ---- arch/x86/include/asm/page_64.h | 4 ++++ arch/x86/include/asm/page_64_types.h | 2 +- arch/x86/include/asm/pgtable_64_types.h | 2 +- arch/x86/kernel/head64.c | 9 +++++++++ arch/x86/mm/kaslr.c | 8 -------- 6 files changed, 15 insertions(+), 14 deletions(-) diff --git a/arch/x86/include/asm/kaslr.h b/arch/x86/include/asm/kaslr.h index 1052a797d71d..683c9d736314 100644 --- a/arch/x86/include/asm/kaslr.h +++ b/arch/x86/include/asm/kaslr.h @@ -4,10 +4,6 @@ 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 b50df06ad251..153496926ffe 100644 --- a/arch/x86/include/asm/page_64.h +++ b/arch/x86/include/asm/page_64.h @@ -10,6 +10,10 @@ 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 3f5f08b010d0..0126d6bc2eb1 100644 --- a/arch/x86/include/asm/page_64_types.h +++ b/arch/x86/include/asm/page_64_types.h @@ -42,7 +42,7 @@ #define __PAGE_OFFSET_BASE _AC(0xffff880000000000, UL) #endif -#ifdef CONFIG_RANDOMIZE_MEMORY +#if defined(CONFIG_RANDOMIZE_MEMORY) || defined(CONFIG_X86_5LEVEL) #define __PAGE_OFFSET page_offset_base #else #define __PAGE_OFFSET __PAGE_OFFSET_BASE diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h index 06470da156ba..a9f77ead7088 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -85,7 +85,7 @@ typedef struct { pteval_t pte; } pte_t; #define __VMALLOC_BASE _AC(0xffffc90000000000, UL) #define __VMEMMAP_BASE _AC(0xffffea0000000000, UL) #endif -#ifdef CONFIG_RANDOMIZE_MEMORY +#if defined(CONFIG_RANDOMIZE_MEMORY) || defined(CONFIG_X86_5LEVEL) #define VMALLOC_START vmalloc_base #define VMEMMAP_START vmemmap_base #else diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index bab4fa579450..d7b683cc0dd5 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -38,6 +38,15 @@ extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD]; static unsigned int __initdata next_early_pgt; pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX); +#if defined(CONFIG_RANDOMIZE_MEMORY) || defined(CONFIG_X86_5LEVEL) +unsigned long page_offset_base __read_mostly = __PAGE_OFFSET_BASE; +EXPORT_SYMBOL(page_offset_base); +unsigned long vmalloc_base __read_mostly = __VMALLOC_BASE; +EXPORT_SYMBOL(vmalloc_base); +unsigned long vmemmap_base __read_mostly = __VMEMMAP_BASE; +EXPORT_SYMBOL(vmemmap_base); +#endif + #define __head __section(.head.text) static void __head *fixup_pointer(void *ptr, unsigned long physaddr) diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c index af599167fe3c..e6420b18f6e0 100644 --- a/arch/x86/mm/kaslr.c +++ b/arch/x86/mm/kaslr.c @@ -53,14 +53,6 @@ static const unsigned long vaddr_end = EFI_VA_END; static const unsigned long vaddr_end = __START_KERNEL_map; #endif -/* Default values */ -unsigned long page_offset_base = __PAGE_OFFSET_BASE; -EXPORT_SYMBOL(page_offset_base); -unsigned long vmalloc_base = __VMALLOC_BASE; -EXPORT_SYMBOL(vmalloc_base); -unsigned long vmemmap_base = __VMEMMAP_BASE; -EXPORT_SYMBOL(vmemmap_base); - /* * Memory regions randomized by KASLR (except modules that use a separate logic * earlier during boot). The list is ordered based on virtual addresses. This -- 2.14.1
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