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author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-04-28 19:43:49 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-04-28 19:43:49 +0300 |
commit | 22b8cc3e78f5448b4c5df00303817a9137cd663f (patch) | |
tree | 4c90f7ebbf4d439ae37f879f0e0f97c2eafd434b /arch/x86/include/uapi/asm/prctl.h | |
parent | 7b664cc38ea7bdd5e3ce018bba98583741921bd4 (diff) | |
parent | 97740266de26e5dfe6e4fbecacb6995b66c2e378 (diff) | |
download | linux-22b8cc3e78f5448b4c5df00303817a9137cd663f.tar.xz |
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/include/uapi/asm/prctl.h')
-rw-r--r-- | arch/x86/include/uapi/asm/prctl.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h index f298c778f856..e8d7ebbca1a4 100644 --- a/arch/x86/include/uapi/asm/prctl.h +++ b/arch/x86/include/uapi/asm/prctl.h @@ -23,4 +23,9 @@ #define ARCH_MAP_VDSO_32 0x2002 #define ARCH_MAP_VDSO_64 0x2003 +#define ARCH_GET_UNTAG_MASK 0x4001 +#define ARCH_ENABLE_TAGGED_ADDR 0x4002 +#define ARCH_GET_MAX_TAG_BITS 0x4003 +#define ARCH_FORCE_TAGGED_SVA 0x4004 + #endif /* _ASM_X86_PRCTL_H */ |