linux-kernel - Re: Another preempt folding issue?

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Message-ID: <20140212104017.GA5121@pd.tnic>
Date:	Wed, 12 Feb 2014 11:40:17 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stefan Bader <stefan.bader@...onical.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>,
	MASAO TAKAHASHI <masao-takahashi@...no.co.jp>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: Another preempt folding issue?

On Wed, Feb 12, 2014 at 11:37:13AM +0100, Peter Zijlstra wrote:
> > Another reporter also saw this on an AMD and said it could not be reproduced on
> > the same hardware and the same software versions when using 64bit instead of 32.
> > 
> > In my case on a 32bit installation I will see this on every invocation of
> 
> Curious.. so its both AMD and Intel.
> 
> That makes funny hardware less likely... but how can the vmexit loose an
> interrupt like this.

Also what I'm wondering about and what's not clear from Stefan's reply
is whether this is purely a 32-bit issue, i.e. a 32-bit host running a
64-bit qemu running a 32-bit iso or what is it?

Or do we have reports for both 32-bit and 64-bit hosts?

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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