linux-kernel - Re: [patch V5 00/31] rseq: Optimize exit to user space

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Message-ID: <20251023092210.GY3245006@noisy.programming.kicks-ass.net>
Date: Thu, 23 Oct 2025 11:22:10 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Michael Jeanson <mjeanson@...icios.com>,
	Jens Axboe <axboe@...nel.dk>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
	Sean Christopherson <seanjc@...gle.com>,
	Wei Liu <wei.liu@...nel.org>
Subject: Re: [patch V5 00/31] rseq: Optimize exit to user space

On Wed, Oct 22, 2025 at 02:52:00PM +0200, Thomas Gleixner wrote:

> 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

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

I'm in favour of getting the scoped_user_MODE_access() and this series
merged this cycle.

I'll look at the next series later.