linux-kernel - Re: [PATCH] x86: make clflush a required feature on x86

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Message-ID: <20080118065428.GA12594@one.firstfloor.org>
Date:	Fri, 18 Jan 2008 07:54:28 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kyle McMartin <kyle@...artin.ca>, Andi Kleen <andi@...stfloor.org>,
	tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: make clflush a required feature on x86_64

> Simulators can be fixed, 

They could, but why? I don't know of a good reason to require CLFLUSH.

> I just verified that Bochs 2.3.0 lacks this CPUID bit whereas the 
> current version, 2.3.6, enables CLFLUSH iff SSE2 is enabled.  Qemu 0.9.0 
> has CLFLUSH.  Andi, do you happen to know of any specific simulators 
> which are problematic?  I would assume any recent version of SimNow is 
> up to date.

I don't know of any specific ones that lack CLFLUSH, although Bochs
definitely had similar problems in the past.

-Andi
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