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From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH FIXED] x86: only enable interrupts when kernel state has been set up
Date: Tue, 25 Mar 2008 11:56:00 +0100	[thread overview]
Message-ID: <20080325105559.GA3729@elte.hu> (raw)
In-Reply-To: <47E83C99.3040800@goop.org>


* Jeremy Fitzhardinge <jeremy@goop.org> wrote:

> The sysenter path tries to enable interrupts immediately.  
> Unfortunately this doesn't work in a paravirt environment, because not 
> enough kernel state has been set up at that point (namely, pointing 
> %fs to the kernel percpu data segment).  To fix this, defer 
> ENABLE_INTERRUPTS until after the kernel state has been set up.
>
> Unfortunately this means that we're running with interrupts disabled 
> for a while without calling the IRQ tracing code, but that can't be 
> called without setting up %fs either.
>
> [ Fix since last posting: make sure saved eflags has interrupts 
> enabled. ]

thanks Jeremy - will give it a shot.

	Ingo

      reply	other threads:[~2008-03-25 10:56 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-24 23:43 [PATCH FIXED] x86: only enable interrupts when kernel state has been set up Jeremy Fitzhardinge
2008-03-25 10:56 ` Ingo Molnar [this message]

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