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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-04-28 09:43:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-04-28 09:43:49 -0700 |
| commit | 22b8cc3e78f5448b4c5df00303817a9137cd663f (patch) | |
| tree | 4c90f7ebbf4d439ae37f879f0e0f97c2eafd434b /arch/x86/Kconfig | |
| parent | 7b664cc38ea7bdd5e3ce018bba98583741921bd4 (diff) | |
| parent | 97740266de26e5dfe6e4fbecacb6995b66c2e378 (diff) | |
| download | linux-stable-22b8cc3e78f5448b4c5df00303817a9137cd663f.tar.gz linux-stable-22b8cc3e78f5448b4c5df00303817a9137cd663f.tar.bz2 linux-stable-22b8cc3e78f5448b4c5df00303817a9137cd663f.zip | |
Merge tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 LAM (Linear Address Masking) support from Dave Hansen:
"Add support for the new Linear Address Masking CPU feature.
This is similar to ARM's Top Byte Ignore and allows userspace to store
metadata in some bits of pointers without masking it out before use"
* tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm/iommu/sva: Do not allow to set FORCE_TAGGED_SVA bit from outside
x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA
selftests/x86/lam: Add test cases for LAM vs thread creation
selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA test cases for linear-address masking
selftests/x86/lam: Add inherit test cases for linear-address masking
selftests/x86/lam: Add io_uring test cases for linear-address masking
selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address masking
selftests/x86/lam: Add malloc and tag-bits test cases for linear-address masking
x86/mm/iommu/sva: Make LAM and SVA mutually exclusive
iommu/sva: Replace pasid_valid() helper with mm_valid_pasid()
mm: Expose untagging mask in /proc/$PID/status
x86/mm: Provide arch_prctl() interface for LAM
x86/mm: Reduce untagged_addr() overhead for systems without LAM
x86/uaccess: Provide untagged_addr() and remove tags before address check
mm: Introduce untagged_addr_remote()
x86/mm: Handle LAM on context switch
x86: CPUID and CR3/CR4 flags for Linear Address Masking
x86: Allow atomic MM_CONTEXT flags setting
x86/mm: Rework address range check in get_user() and put_user()
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f87590c3c382..53bab123a8ee 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2290,6 +2290,17 @@ config RANDOMIZE_MEMORY_PHYSICAL_PADDING If unsure, leave at the default value. +config ADDRESS_MASKING + bool "Linear Address Masking support" + depends on X86_64 + help + Linear Address Masking (LAM) modifies the checking that is applied + to 64-bit linear addresses, allowing software to use of the + untranslated address bits for metadata. + + The capability can be used for efficient address sanitizers (ASAN) + implementation and for optimizations in JITs. + config HOTPLUG_CPU def_bool y depends on SMP |