On 1/24/2023 6:04 AM, Kirill A. Shutemov wrote:
Linear Address Masking[1] (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 and virtual machines.
The patchset brings support for LAM for userspace addresses. Only LAM_U57 at
this time.
Please review and consider applying.
git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git lam
...
[1] ISE, Chapter 10. https://cdrdv2.intel.com/v1/dl/getContent/671368
It is Chapter 7. Or maybe use the name of the chapter instead.
Kirill A. Shutemov (12):
x86/mm: Rework address range check in get_user() and put_user()
x86: Allow atomic MM_CONTEXT flags setting
x86: CPUID and CR3/CR4 flags for Linear Address Masking
x86/mm: Handle LAM on context switch
mm: Introduce untagged_addr_remote()
x86/uaccess: Provide untagged_addr() and remove tags before address
check
x86/mm: Reduce untagged_addr() overhead for systems without LAM
x86/mm: Provide arch_prctl() interface for LAM
mm: Expose untagging mask in /proc/$PID/status
iommu/sva: Replace pasid_valid() helper with mm_valid_pasid()
x86/mm/iommu/sva: Make LAM and SVA mutually exclusive
selftests/x86/lam: Add test cases for LAM vs thread creation
Weihong Zhang (5):
selftests/x86/lam: Add malloc and tag-bits test cases for
linear-address masking
selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address
masking
selftests/x86/lam: Add io_uring test cases for linear-address masking
selftests/x86/lam: Add inherit test cases for linear-address masking
selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA test cases for
linear-address masking
arch/arm64/include/asm/mmu_context.h | 6 +
arch/sparc/include/asm/mmu_context_64.h | 6 +
arch/sparc/include/asm/uaccess_64.h | 2 +
arch/x86/Kconfig | 11 +
arch/x86/entry/vsyscall/vsyscall_64.c | 2 +-
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/include/asm/disabled-features.h | 8 +-
arch/x86/include/asm/mmu.h | 18 +-
arch/x86/include/asm/mmu_context.h | 49 +-
arch/x86/include/asm/processor-flags.h | 2 +
arch/x86/include/asm/tlbflush.h | 48 +-
arch/x86/include/asm/uaccess.h | 58 +-
arch/x86/include/uapi/asm/prctl.h | 5 +
arch/x86/include/uapi/asm/processor-flags.h | 6 +
arch/x86/kernel/process.c | 6 +
arch/x86/kernel/process_64.c | 66 +-
arch/x86/kernel/traps.c | 6 +-
arch/x86/lib/getuser.S | 83 +-
arch/x86/lib/putuser.S | 54 +-
arch/x86/mm/init.c | 5 +
arch/x86/mm/tlb.c | 53 +-
drivers/iommu/iommu-sva.c | 8 +-
drivers/vfio/vfio_iommu_type1.c | 2 +-
fs/proc/array.c | 6 +
fs/proc/task_mmu.c | 9 +-
include/linux/ioasid.h | 9 -
include/linux/mm.h | 11 -
include/linux/mmu_context.h | 14 +
include/linux/sched/mm.h | 8 +-
include/linux/uaccess.h | 22 +
mm/debug.c | 1 +
mm/gup.c | 4 +-
mm/madvise.c | 5 +-
mm/migrate.c | 11 +-
tools/testing/selftests/x86/Makefile | 2 +-
tools/testing/selftests/x86/lam.c | 1241 +++++++++++++++++++
36 files changed, 1699 insertions(+), 149 deletions(-)
create mode 100644 tools/testing/selftests/x86/lam.c
--
2.39.1
