linux-kernel - [patch V6 00/31] rseq: Optimize exit to user space

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Message-ID: <20251027084220.785525188@linutronix.de>
Date: Mon, 27 Oct 2025 09:44:14 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Michael Jeanson <mjeanson@...icios.com>,
 Jens Axboe <axboe@...nel.dk>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Peter Zijlstra <peterz@...radead.org>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 x86@...nel.org,
 Sean Christopherson <seanjc@...gle.com>,
 Wei Liu <wei.liu@...nel.org>
Subject: [patch V6 00/31] rseq: Optimize exit to user space

This is a trivial follow up on the V5 series, which can be found here:

   https://lore.kernel.org/all/20251022121836.019469732@linutronix.de

Changes vs. V5:

  - Adjust to the uaccess changes

As for the previous version these patches have a dependency on the uaccess
scope series:

   https://lore.kernel.org/20251027083700.573016505@linutronix.de

which is available at:

    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git uaccess/scoped

For your convenience the combination of both is available from git:

    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git rseq/perf

Thanks,

	tglx
---
Thomas Gleixner (31):
      rseq: Avoid pointless evaluation in __rseq_notify_resume()
      rseq: Condense the inline stubs
      rseq: Move algorithm comment to top
      rseq: Remove the ksig argument from rseq_handle_notify_resume()
      rseq: Simplify registration
      rseq: Simplify the event notification
      rseq, virt: Retrigger RSEQ after vcpu_run()
      rseq: Avoid CPU/MM CID updates when no event pending
      rseq: Introduce struct rseq_data
      entry: Cleanup header
      entry: Remove syscall_enter_from_user_mode_prepare()
      entry: Inline irqentry_enter/exit_from/to_user_mode()
      sched: Move MM CID related functions to sched.h
      rseq: Cache CPU ID and MM CID values
      rseq: Record interrupt from user space
      rseq: Provide tracepoint wrappers for inline code
      rseq: Expose lightweight statistics in debugfs
      rseq: Provide static branch for runtime debugging
      rseq: Provide and use rseq_update_user_cs()
      rseq: Replace the original debug implementation
      rseq: Make exit debugging static branch based
      rseq: Use static branch for syscall exit debug when GENERIC_IRQ_ENTRY=y
      rseq: Provide and use rseq_set_ids()
      rseq: Separate the signal delivery path
      rseq: Rework the TIF_NOTIFY handler
      rseq: Optimize event setting
      rseq: Implement fast path for exit to user
      rseq: Switch to fast path processing on exit to user
      entry: Split up exit_to_user_mode_prepare()
      rseq: Split up rseq_exit_to_user_mode()
      rseq: Switch to TIF_RSEQ if supported

 Documentation/admin-guide/kernel-parameters.txt |    4 
 arch/x86/entry/syscall_32.c                     |    3 
 drivers/hv/mshv_root_main.c                     |    3 
 fs/binfmt_elf.c                                 |    2 
 fs/exec.c                                       |    2 
 include/asm-generic/thread_info_tif.h           |    3 
 include/linux/entry-common.h                    |   38 -
 include/linux/irq-entry-common.h                |   68 ++
 include/linux/mm.h                              |   25 
 include/linux/resume_user_mode.h                |    2 
 include/linux/rseq.h                            |  228 +++++---
 include/linux/rseq_entry.h                      |  592 +++++++++++++++++++++
 include/linux/rseq_types.h                      |   93 +++
 include/linux/sched.h                           |   48 +
 include/linux/thread_info.h                     |    5 
 include/trace/events/rseq.h                     |    4 
 include/uapi/linux/rseq.h                       |   21 
 init/Kconfig                                    |   28 -
 kernel/entry/common.c                           |   39 -
 kernel/entry/syscall-common.c                   |    8 
 kernel/ptrace.c                                 |    6 
 kernel/rseq.c                                   |  654 ++++++++++--------------
 kernel/sched/core.c                             |   10 
 kernel/sched/membarrier.c                       |    8 
 kernel/sched/sched.h                            |    5 
 virt/kvm/kvm_main.c                             |    7 
 26 files changed, 1301 insertions(+), 605 deletions(-)