linux-kernel - [PATCH 5/9] x86/mm: Initialize vmemmap

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Date:   Wed, 14 Feb 2018 21:25:38 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...e.de>, Andi Kleen <ak@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 5/9] x86/mm: Initialize vmemmap_base at boot-time

vmemmap area has different placement depending on paging mode.
Let's adjust it during early boot accodring to machine capability.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/include/asm/pgtable_64_types.h | 9 +++------
 arch/x86/kernel/head64.c                | 3 ++-
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 686329994ade..68909a68e5b9 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -108,11 +108,8 @@ extern unsigned int ptrs_per_p4d;
 #define VMALLOC_SIZE_TB_L4	32UL
 #define VMALLOC_SIZE_TB_L5	12800UL
 
-#ifdef CONFIG_X86_5LEVEL
-# define __VMEMMAP_BASE		_AC(0xffd4000000000000, UL)
-#else
-# define __VMEMMAP_BASE		_AC(0xffffea0000000000, UL)
-#endif
+#define __VMEMMAP_BASE_L4	0xffffea0000000000
+#define __VMEMMAP_BASE_L5	0xffd4000000000000
 
 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
 # define VMALLOC_START		vmalloc_base
@@ -121,7 +118,7 @@ extern unsigned int ptrs_per_p4d;
 #else
 # define VMALLOC_START		__VMALLOC_BASE_L4
 # define VMALLOC_SIZE_TB	VMALLOC_SIZE_TB_L4
-# define VMEMMAP_START		__VMEMMAP_BASE
+# define VMEMMAP_START		__VMEMMAP_BASE_L4
 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
 
 #define VMALLOC_END		(VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 22bf2015254c..795e762f3c66 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -53,7 +53,7 @@ unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4;
 EXPORT_SYMBOL(page_offset_base);
 unsigned long vmalloc_base __ro_after_init = __VMALLOC_BASE_L4;
 EXPORT_SYMBOL(vmalloc_base);
-unsigned long vmemmap_base __ro_after_init = __VMEMMAP_BASE;
+unsigned long vmemmap_base __ro_after_init = __VMEMMAP_BASE_L4;
 EXPORT_SYMBOL(vmemmap_base);
 #endif
 
@@ -88,6 +88,7 @@ static void __head check_la57_support(unsigned long physaddr)
 	*fixup_int(&ptrs_per_p4d, physaddr) = 512;
 	*fixup_long(&page_offset_base, physaddr) = __PAGE_OFFSET_BASE_L5;
 	*fixup_long(&vmalloc_base, physaddr) = __VMALLOC_BASE_L5;
+	*fixup_long(&vmemmap_base, physaddr) = __VMEMMAP_BASE_L5;
 }
 #else
 static void __head check_la57_support(unsigned long physaddr) {}
-- 
2.15.1