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

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Message-ID: <20080111181659.GB4016@ucw.cz>
Date:	Fri, 11 Jan 2008 18:16:59 +0000
From:	Pavel Machek <pavel@....cz>
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

On Fri 2008-01-18 01:27:06, H. Peter Anvin wrote:
> Kyle McMartin wrote:
> >On Fri, Jan 18, 2008 at 06:53:53AM +0100, Andi Kleen 
> >wrote:
> >>One problem that we had in the past is that some 
> >>simulators
> >>only implement the absolutely minimum feature set and 
> >>you
> >>might have well broken one of these with this.
> >
> >Yeah, true. Please ignore the patch folks.
> >
> >cheers,	Kyle
> 
> Simulators can be fixed, even if it takes time; for 
> something like clflush this is easier since clflush can 
> be implemented as a simple noop for most of them.
> 
> 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.

simics? It was very useful long time ago...
							Pavel
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