linux-kernel - Re: [PATCH 2/5] Paravirt cpu batching.patch

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Message-ID: <200612121853_MC3-1-D4D2-191A@compuserve.com>
Date:	Tue, 12 Dec 2006 18:49:57 -0500
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>
Subject: Re: [PATCH 2/5] Paravirt cpu batching.patch

In-Reply-To: <20061212225430.GC10475@...uoia.sous-sol.org>

On Tue, 12 Dec 2006 14:54:30 -0800, Chros Wright wrote:

> > --- a/arch/i386/kernel/process.c    Tue Dec 12 13:50:50 2006 -0800
> > +++ b/arch/i386/kernel/process.c    Tue Dec 12 13:50:53 2006 -0800
> > @@ -665,6 +665,37 @@ struct task_struct fastcall * __switch_t
> >     load_TLS(next, cpu);
> >  
> >     /*
> > +    * Restore IOPL if needed.
> > +    */
> > +   if (unlikely(prev->iopl != next->iopl))
> > +           set_iopl_mask(next->iopl);
>
> Small sidenote that this bit undoes a recent change from Chuck Ebbert, which
> killed iopl_mask update via hypervisor.

This whole thing needs a proper fix IMO.  I posted something a while back
but Andi didn't like it, I guess.

-- 
MBTI: IXTP

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