linux-kernel - [PATCH 0/6] x86/fpu: don't abuse x86_task_fpu(PF_USER_WORKER) in .regset

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Message-ID: <20250814101340.GA17288@redhat.com>
Date: Thu, 14 Aug 2025 12:13:40 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Jens Axboe <axboe@...nel.dk>, Peter Zijlstra <peterz@...radead.org>,
	Rick Edgecombe <rick.p.edgecombe@...el.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH 0/6] x86/fpu: don't abuse x86_task_fpu(PF_USER_WORKER) in
 .regset_get() paths

Sorry, I have no idea how to test these changes, please review. Especially
4/6 and 5/6, I don't really understand shstk.c.

If you are fine with these changes, I'll try to update the fpregs_soft_get()
and user_regset.set() paths as well.

Oleg.
---

 arch/x86/include/asm/shstk.h |  8 ++++----
 arch/x86/kernel/fpu/regset.c | 46 ++++++++++++++++++++++++++------------------
 arch/x86/kernel/fpu/xstate.c | 12 ++++++------
 arch/x86/kernel/fpu/xstate.h |  4 ++--
 arch/x86/kernel/process.c    |  2 +-
 arch/x86/kernel/process_64.c |  2 +-
 arch/x86/kernel/shstk.c      | 19 +++++++++++++-----
 7 files changed, 55 insertions(+), 38 deletions(-)