linux-kernel - Re: [PATCH v3 3/8] x86, lib: Add WBNOINVD helper functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aG_GlsJWRU0fVxt4@google.com>
Date: Thu, 10 Jul 2025 06:56:38 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	Paolo Bonzini <pbonzini@...hat.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	Kevin Loughlin <kevinloughlin@...gle.com>, Tom Lendacky <thomas.lendacky@....com>, 
	Kai Huang <kai.huang@...el.com>, Ingo Molnar <mingo@...nel.org>, 
	Zheyun Shen <szy0127@...u.edu.cn>, Mingwei Zhang <mizhang@...gle.com>, 
	Francesco Lavra <francescolavra.fl@...il.com>
Subject: Re: [PATCH v3 3/8] x86, lib: Add WBNOINVD helper functions

On Thu, Jul 10, 2025, Borislav Petkov wrote:
> On Thu, May 22, 2025 at 04:37:27PM -0700, Sean Christopherson wrote:
> > diff --git a/arch/x86/lib/cache-smp.c b/arch/x86/lib/cache-smp.c
> > index 079c3f3cd32c..1789db5d8825 100644
> > --- a/arch/x86/lib/cache-smp.c
> > +++ b/arch/x86/lib/cache-smp.c
> > @@ -19,3 +19,14 @@ void wbinvd_on_all_cpus(void)
> >  	on_each_cpu(__wbinvd, NULL, 1);
> >  }
> >  EXPORT_SYMBOL(wbinvd_on_all_cpus);
> > +
> > +static void __wbnoinvd(void *dummy)
> > +{
> > +	wbnoinvd();
> > +}
> > +
> > +void wbnoinvd_on_all_cpus(void)
> > +{
> > +	on_each_cpu(__wbnoinvd, NULL, 1);
> > +}
> > +EXPORT_SYMBOL(wbnoinvd_on_all_cpus);
> 
> If there's no particular reason for the non-GPL export besides being
> consistent with the rest - yes, I did the change for wbinvd_on_all_cpus() but
> that was loooong time ago - I'd simply make this export _GPL.

Yeah, AFAIK, no reason other than consistency.  GPL it.