From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@amacapital.net>,
Borislav Petkov <bp@suse.de>, Andi Kleen <ak@linux.intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH 1/9] x86/mm/64: Make __PHYSICAL_MASK_SHIFT always 52
Date: Wed, 14 Feb 2018 14:16:48 +0300 [thread overview]
Message-ID: <20180214111656.88514-2-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20180214111656.88514-1-kirill.shutemov@linux.intel.com>
__PHYSICAL_MASK_SHIFT is used to define the mask that helps to extract
physical address from a page table entry.
Although, real physical address space available may differ between
machines, it's safe to use 52 as __PHYSICAL_MASK_SHIFT. Unused bits
above log2(MAXPHYADDR) up to bit 51 are reserved and must be 0.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/include/asm/page_64_types.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h
index e1407312c412..f68e6526891d 100644
--- a/arch/x86/include/asm/page_64_types.h
+++ b/arch/x86/include/asm/page_64_types.h
@@ -52,11 +52,12 @@
#define __START_KERNEL_map _AC(0xffffffff80000000, UL)
/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
-#ifdef CONFIG_X86_5LEVEL
+
#define __PHYSICAL_MASK_SHIFT 52
+
+#ifdef CONFIG_X86_5LEVEL
#define __VIRTUAL_MASK_SHIFT 56
#else
-#define __PHYSICAL_MASK_SHIFT 46
#define __VIRTUAL_MASK_SHIFT 47
#endif
--
2.15.1
--
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next prev parent reply other threads:[~2018-02-14 11:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-14 11:16 [PATCH 0/9] x86/mm: Dynamic memory layout Kirill A. Shutemov
2018-02-14 11:16 ` Kirill A. Shutemov [this message]
2018-02-14 11:16 ` [PATCH 2/9] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 3/9] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 4/9] x86: Introduce pgtable_l5_enabled Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 5/9] x86/mm: Make LDT_BASE_ADDR dynamic Kirill A. Shutemov
2018-02-14 13:32 ` Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 6/9] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 7/9] x86/mm: Make MAX_PHYSADDR_BITS and MAX_PHYSMEM_BITS dynamic Kirill A. Shutemov
2018-02-14 11:16 ` [PATCH 8/9] x86/mm: Make __VIRTUAL_MASK_SHIFT dynamic Kirill A. Shutemov
2018-02-14 17:22 ` Andy Lutomirski
2018-02-14 17:55 ` Kirill A. Shutemov
2018-02-14 18:02 ` Andy Lutomirski
2018-02-14 11:16 ` [PATCH 9/9] x86/mm: Adjust virtual address space layout in early boot Kirill A. Shutemov
2018-02-14 12:10 ` Ingo Molnar
2018-02-14 12:19 ` Kirill A. Shutemov
2018-02-14 12:26 ` Ingo Molnar
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