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From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Rik van Riel <riel@surriel.com>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v3 05/10] x86/fpu/xstate: Define new functions for clearing fpregs and xstates
Date: Wed, 29 Apr 2020 10:02:46 -0700	[thread overview]
Message-ID: <1b43e3cc36dd707c0268e96b166eca4421d7c2e2.camel@intel.com> (raw)
In-Reply-To: <20200429163906.GC16407@zn.tnic>

On Wed, 2020-04-29 at 18:39 +0200, Borislav Petkov wrote:
> On Wed, Apr 29, 2020 at 09:06:44AM -0700, Yu-cheng Yu wrote:
> > From: Fenghua Yu <fenghua.yu@intel.com>
> > 
> > Currently, fpu__clear() clears all fpregs and xstates.  Once XSAVES
> > supervisor states are introduced, supervisor settings (e.g. CET xstates)
> > must remain active for signals; It is necessary to have separate functions:
> > 
> > - Create fpu__clear_user_states(): clear only user settings for signals;
> > - Create fpu__clear_all(): clear both user and supervisor settings in
> >    flush_thread().
> > 
> > Also modify copy_init_fpstate_to_fpregs() to take a mask from above two
> > functions.
> > 
> > Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
> > Co-developed-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
> > Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
> > Reviewed-by: Tony Luck <tony.luck@intel.com>
> > 
> > v3:
> > - Put common code into a static function fpu__clear(), with a parameter
> >   user_only.
> > 
> > v2:
> > - Fixed an issue where fpu__clear_user_states() drops supervisor xstates.
> > - Revise commit log.
> 
> Try applying that patch from this mail yourself and see whether the
> patch changelog will remain in the commit message or it will get
> discarded.

My mistake!  I will fix it.

> 
> > @@ -318,18 +313,40 @@ static inline void copy_init_fpstate_to_fpregs(void)
> >   * Called by sys_execve(), by the signal handler code and by various
> >   * error paths.
> >   */
> > -void fpu__clear(struct fpu *fpu)
> > +static void fpu__clear(struct fpu *fpu, int user_only)
> >  {
> > -	WARN_ON_FPU(fpu != &current->thread.fpu); /* Almost certainly an anomaly */
> > +	WARN_ON_FPU(fpu != &current->thread.fpu);
> 
> Why did you remove the side comment?
> 
> Is it wrong?
> 
> Why do you do such arbitrary changes which are not needed instead of
> concentrating on only the changes the patch should do?

It has been some time since Thomas commented on this tail comment.
https://lore.kernel.org/lkml/alpine.DEB.2.21.1908161703010.1923@nanos.tec.linutronix.de/

I think why not fixing it while at it.

Yu-cheng


  reply	other threads:[~2020-04-29 17:02 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-28 16:42 [PATCH v3 00/10] Support XSAVES supervisor states Yu-cheng Yu
2020-03-28 16:42 ` [PATCH v3 01/10] x86/fpu/xstate: Rename validate_xstate_header() to validate_user_xstate_header() Yu-cheng Yu
2020-04-28 17:11   ` Borislav Petkov
2020-04-28 17:15     ` Yu-cheng Yu
2020-03-28 16:42 ` [PATCH v3 02/10] x86/fpu/xstate: Define new macros for supervisor and user xstates Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 03/10] x86/fpu/xstate: Separate user and supervisor xfeatures mask Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 04/10] x86/fpu/xstate: Introduce XSAVES supervisor states Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 05/10] x86/fpu/xstate: Define new functions for clearing fpregs and xstates Yu-cheng Yu
2020-04-29  9:27   ` Borislav Petkov
2020-04-29 16:09     ` Yu-cheng Yu
2020-04-29 16:06   ` Yu-cheng Yu
2020-04-29 16:39     ` Borislav Petkov
2020-04-29 17:02       ` Yu-cheng Yu [this message]
2020-04-29 17:32         ` Borislav Petkov
2020-04-29 17:42   ` Yu-cheng Yu
2020-04-29 19:10   ` Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 06/10] x86/fpu/xstate: Update sanitize_restored_xstate() for supervisor xstates Yu-cheng Yu
2020-05-07 13:11   ` Borislav Petkov
2020-05-07 15:55   ` Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 07/10] x86/fpu/xstate: Update copy_kernel_to_xregs_err() for XSAVES supervisor states Yu-cheng Yu
2020-05-07 13:28   ` Borislav Petkov
2020-05-07 15:58   ` Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 08/10] x86/fpu: Introduce copy_supervisor_to_kernel() Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 09/10] x86/fpu/xstate: Preserve supervisor states for slow path of __fpu__restore_sig() Yu-cheng Yu
2020-05-10  8:46   ` Borislav Petkov
2020-05-11 20:16   ` Yu-cheng Yu
2020-03-28 16:43 ` [PATCH v3 10/10] x86/fpu/xstate: Restore supervisor states for signal return Yu-cheng Yu
2020-05-10  8:49   ` Borislav Petkov
2020-05-11 20:20   ` Yu-cheng Yu
2020-05-11 20:27 ` [PATCH v3 00/10] Support XSAVES supervisor states Borislav Petkov

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