linux-kernel - Re: [PATCH 08/11] x86: document X86_INTEL

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: <Z1FeWwoyJMA0Zx5z@smile.fi.intel.com>
Date: Thu, 5 Dec 2024 10:03:39 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Arnd Bergmann <arnd@...nel.org>, Ferry Toth <fntoth@...il.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Davide Ciminaghi <ciminaghi@...dd.com>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 08/11] x86: document X86_INTEL_MID as 64-bit-only

On Wed, Dec 04, 2024 at 09:38:05PM +0100, Arnd Bergmann wrote:
> On Wed, Dec 4, 2024, at 19:55, Andy Shevchenko wrote:
> > On Wed, Dec 4, 2024 at 12:31 PM Arnd Bergmann <arnd@...nel.org> wrote:

...

> > It's all other way around (from SW point of view). For unknown reasons
> > Intel decided to release only 32-bit SW and it became the only thing
> > that was heavily tested (despite misunderstanding by some developers
> > that pointed finger to the HW without researching the issue that
> > appears to be purely software in a few cases) _that_ time.  Starting
> > ca. 2017 I enabled 64-bit for Merrifield and from then it's being used
> > by both 32- and 64-bit builds.
> >
> > I'm totally fine to drop 32-bit defaults for Merrifield/Moorefield,
> > but let's hear Ferry who might/may still have a use case for that.
> 
> Ok. I tried to find the oldest Android image and saw it used a 64-bit
> kernel, but that must have been after your work then.

I stand up corrected, what I said is related to Merrifield, Moorefield
may have 64-bit users on the phones from day 1, though.

...

> Changed now to
> 
>           The only supported devices are the 22nm Merrified (Z34xx) and
>           Moorefield (Z35xx) SoC used in the Intel Edison board and
>           a small number of Android devices such as the Asus Zenfone 2,
>           Asus FonePad 8 and Dell Venue 7.

LGTM, thanks!

...

> >> -         Intel MID platforms are based on an Intel processor and chipset which
> >> -         consume less power than most of the x86 derivatives.
> >
> > Why remove this? AFAIK it states the truth.
> 
> It seemed irrelevant for users that configure the kernel. I've
> put it back now.

It might be, but it was already there. Thanks for leaving it untouched.

-- 
With Best Regards,
Andy Shevchenko