linux-kernel - Re: [PATCH 1/4] x86 paravirt_ops: create no

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Message-Id: <200608070816.03261.ak@muc.de>
Date:	Mon, 7 Aug 2006 08:16:03 +0200
From:	Andi Kleen <ak@....de>
To:	virtualization@...ts.osdl.org
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 1/4] x86 paravirt_ops: create no_paravirt.h for native ops

On Monday 07 August 2006 08:03, Rusty Russell wrote:
> On Sun, 2006-08-06 at 22:43 -0700, Jeremy Fitzhardinge wrote:
> > Andi Kleen wrote:
> > >> +/* Stop speculative execution */
> > >> +static inline void sync_core(void)
> > >> +{
> > >> +	unsigned int eax = 1, ebx, ecx, edx;
> > >> +	__cpuid(&eax, &ebx, &ecx, &edx);
> > >> +}
> > >>     
> > >
> > > Actually I don't think this one should be para virtualized at all.
> > > I don't see any reason at all why a hypervisor should trap it and it
> > > is very time critical. I would recommend you move it back into the 
> > > normal files without hooks.
> 
> I don't see where it's time-critical...

See explanation in my other email. Also in general we want this one fast.

-Andi
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