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

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Message-ID: <541AD8F3.5010700@redhat.com>
Date:	Thu, 18 Sep 2014 15:06:59 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>,
	Nadav Amit <namit@...technion.ac.il>
CC:	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

Il 17/09/2014 16:06, Borislav Petkov ha scritto:
>> > AFAIK backward compatibility is usually maintained in x86. I did not
>> > see in Intel SDM anything that says "this CPUID field means something
>> > for CPU X and something else for CPU Y". Anyhow, it is not different
>> > than bitmasks in this respect.
> You still don't get my point: what are you going to do when
> min_monitor_line_size needs to be 17 bits all of a sudden?

The extra bit used to be reserved and thus will be zero on older
families.  So, nothing?

Paolo
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