On Fri, Sep 30, 2022 at 4:48 PM Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> 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 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 Not a big deal, but this tree contains LAM_U48 patches, and after skipping those the SVM patch does not apply cleanly. > v9: > - Fix race between LAM enabling and check that KVM memslot address doesn't > have any tags; > - Reduce untagged_addr() overhead until the first LAM user; > - Clarify SVM vs. LAM semantics; > - Use mmap_lock to serialize LAM enabling; > v8: > - Drop redundant smb_mb() in prctl_enable_tagged_addr(); > - Cleanup code around build_cr3(); > - Fix commit messages; > - Selftests updates; > - Acked/Reviewed/Tested-bys from Alexander and Peter; > v7: > - Drop redundant smb_mb() in prctl_enable_tagged_addr(); > - Cleanup code around build_cr3(); > - Fix commit message; > - Fix indentation; > v6: > - Rebased onto v6.0-rc1 > - LAM_U48 excluded from the patchet. Still available in the git tree; > - add ARCH_GET_MAX_TAG_BITS; > - Fix build without CONFIG_DEBUG_VM; > - Update comments; > - Reviewed/Tested-by from Alexander; > v5: > - Do not use switch_mm() in enable_lam_func() > - Use mb()/READ_ONCE() pair on LAM enabling; > - Add self-test by Weihong Zhang; > - Add comments; > v4: > - Fix untagged_addr() for LAM_U48; > - Remove no-threads restriction on LAM enabling; > - Fix mm_struct access from /proc/$PID/arch_status > - Fix LAM handling in initialize_tlbstate_and_flush() > - Pack tlb_state better; > - Comments and commit messages; > v3: > - Rebased onto v5.19-rc1 > - Per-process enabling; > - API overhaul (again); > - Avoid branches and costly computations in the fast path; > - LAM_U48 is in optional patch. > v2: > - Rebased onto v5.18-rc1 > - New arch_prctl(2)-based API > - Expose status of LAM (or other thread features) in > /proc/$PID/arch_status > > [1] ISE, Chapter 10. https://cdrdv2.intel.com/v1/dl/getContent/671368 > > Kirill A. Shutemov (10): > x86/mm: Fix CR3_ADDR_MASK > x86: CPUID and CR3/CR4 flags for Linear Address Masking > mm: Pass down mm_struct to untagged_addr() > x86/mm: Handle LAM on context switch > x86/uaccess: Provide untagged_addr() and remove tags before address > check > KVM: Serialize tagged address check against tagging enabling > x86/mm: Provide arch_prctl() interface for LAM > x86/mm: Reduce untagged_addr() overhead until the first LAM user > x86: Expose untagging mask in /proc/$PID/arch_status > x86/mm, iommu/sva: Make LAM and SVM mutually exclusive > > Weihong Zhang (4): > 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 > > arch/arm64/include/asm/memory.h | 4 +- > arch/arm64/include/asm/signal.h | 2 +- > arch/arm64/include/asm/uaccess.h | 4 +- > arch/arm64/kernel/hw_breakpoint.c | 2 +- > arch/arm64/kernel/traps.c | 4 +- > arch/arm64/mm/fault.c | 10 +- > arch/sparc/include/asm/pgtable_64.h | 2 +- > arch/sparc/include/asm/uaccess_64.h | 2 + > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/asm/mmu.h | 12 +- > arch/x86/include/asm/mmu_context.h | 47 + > arch/x86/include/asm/processor-flags.h | 4 +- > arch/x86/include/asm/tlbflush.h | 35 + > arch/x86/include/asm/uaccess.h | 46 +- > arch/x86/include/uapi/asm/prctl.h | 5 + > arch/x86/include/uapi/asm/processor-flags.h | 6 + > arch/x86/kernel/Makefile | 2 + > arch/x86/kernel/fpu/xstate.c | 47 - > arch/x86/kernel/proc.c | 60 ++ > arch/x86/kernel/process.c | 3 + > arch/x86/kernel/process_64.c | 82 +- > arch/x86/mm/tlb.c | 48 +- > .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 2 +- > drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 2 +- > drivers/gpu/drm/radeon/radeon_gem.c | 2 +- > drivers/infiniband/hw/mlx4/mr.c | 2 +- > drivers/iommu/iommu-sva-lib.c | 12 + > drivers/media/common/videobuf2/frame_vector.c | 2 +- > drivers/media/v4l2-core/videobuf-dma-contig.c | 2 +- > .../staging/media/atomisp/pci/hmm/hmm_bo.c | 2 +- > drivers/tee/tee_shm.c | 2 +- > drivers/vfio/vfio_iommu_type1.c | 2 +- > fs/proc/task_mmu.c | 2 +- > include/linux/mm.h | 11 - > include/linux/mmu_context.h | 4 + > include/linux/uaccess.h | 15 + > lib/strncpy_from_user.c | 2 +- > lib/strnlen_user.c | 2 +- > mm/gup.c | 6 +- > mm/madvise.c | 2 +- > mm/mempolicy.c | 6 +- > mm/migrate.c | 2 +- > mm/mincore.c | 2 +- > mm/mlock.c | 4 +- > mm/mmap.c | 2 +- > mm/mprotect.c | 2 +- > mm/mremap.c | 2 +- > mm/msync.c | 2 +- > tools/testing/selftests/x86/Makefile | 2 +- > tools/testing/selftests/x86/lam.c | 916 ++++++++++++++++++ > virt/kvm/kvm_main.c | 14 +- > 51 files changed, 1331 insertions(+), 125 deletions(-) > create mode 100644 arch/x86/kernel/proc.c > create mode 100644 tools/testing/selftests/x86/lam.c > > -- > 2.35.1 > -- Alexander Potapenko Software Engineer Google Germany GmbH Erika-Mann-Straße, 33 80636 München Geschäftsführer: Paul Manicle, Liana Sebastian Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg
