linux-kernel - Re: [RESEND PATCH 1/3] x86: Adding structs to reflect cpuid fields

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Message-ID: <20140919103244.GA2027@nazgul.tnic>
Date:	Fri, 19 Sep 2014 12:32:44 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Nadav Amit <nadav.amit@...il.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Nadav Amit <namit@...technion.ac.il>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	the arch/x86 maintainers <x86@...nel.org>,
	kvm <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RESEND PATCH 1/3] x86: Adding structs to reflect cpuid fields

On Fri, Sep 19, 2014 at 11:59:32AM +0300, Nadav Amit wrote:
> As for the concern that CPUID fields would be extended into non-zero
> reserved bits - can someone point me to a single case that occurred in
> the last 20 years during which CPUID existed?

Do you have a guarantee that this won't happen in the future and break
all your fancy bitfields assumptions?

-- 
Regards/Gruss,
    Boris.
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