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Message-Id: <20150916174906.889ACF20@viggo.jf.intel.com>
Date: Wed, 16 Sep 2015 10:49:06 -0700
From: Dave Hansen <dave@...1.net>
To: dave@...1.net
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 08/26] x86, pkeys: store protection in high VMA flags
vma->vm_flags is an 'unsigned long', so has space for 32 flags
on 32-bit architectures. The high 32 bits are unused on 64-bit
platforms. We've steered away from using the unused high VMA
bits for things because we would have difficulty supporting it
on 32-bit.
Protection Keys are not available in 32-bit mode, so there is
no concern about supporting this feature in 32-bit mode or on
32-bit CPUs.
This patch carves out 4 bits from the high half of
vma->vm_flags and allows architectures to set config option
to make them available.
Sparse complains about these constants unless we explicitly
call them "UL".
---
b/arch/x86/Kconfig | 1 +
b/include/linux/mm.h | 7 +++++++
b/mm/Kconfig | 3 +++
3 files changed, 11 insertions(+)
diff -puN arch/x86/Kconfig~pkeys-07-eat-high-vma-flags arch/x86/Kconfig
--- a/arch/x86/Kconfig~pkeys-07-eat-high-vma-flags 2015-09-16 10:48:14.638118972 -0700
+++ b/arch/x86/Kconfig 2015-09-16 10:48:14.646119334 -0700
@@ -152,6 +152,7 @@ config X86
select VIRT_TO_BUS
select X86_DEV_DMA_OPS if X86_64
select X86_FEATURE_NAMES if PROC_FS
+ select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS
config INSTRUCTION_DECODER
def_bool y
diff -puN include/linux/mm.h~pkeys-07-eat-high-vma-flags include/linux/mm.h
--- a/include/linux/mm.h~pkeys-07-eat-high-vma-flags 2015-09-16 10:48:14.640119062 -0700
+++ b/include/linux/mm.h 2015-09-16 10:48:14.647119380 -0700
@@ -157,6 +157,13 @@ extern unsigned int kobjsize(const void
#define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */
#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */
+#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
+#define VM_HIGH_ARCH_0 0x100000000UL /* bit only usable on 64-bit architectures */
+#define VM_HIGH_ARCH_1 0x200000000UL /* bit only usable on 64-bit architectures */
+#define VM_HIGH_ARCH_2 0x400000000UL /* bit only usable on 64-bit architectures */
+#define VM_HIGH_ARCH_3 0x800000000UL /* bit only usable on 64-bit architectures */
+#endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
+
#if defined(CONFIG_X86)
# define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
#elif defined(CONFIG_PPC)
diff -puN mm/Kconfig~pkeys-07-eat-high-vma-flags mm/Kconfig
--- a/mm/Kconfig~pkeys-07-eat-high-vma-flags 2015-09-16 10:48:14.642119153 -0700
+++ b/mm/Kconfig 2015-09-16 10:48:14.647119380 -0700
@@ -680,3 +680,6 @@ config ZONE_DEVICE
config FRAME_VECTOR
bool
+
+config ARCH_USES_HIGH_VMA_FLAGS
+ bool
_
--
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