linux-kernel - Re: Another preempt folding issue?

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Message-ID: <20140212111205.GE23709@8bytes.org>
Date:	Wed, 12 Feb 2014 12:12:05 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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>
Subject: Re: Another preempt folding issue?

On Wed, Feb 12, 2014 at 11:40:17AM +0100, Borislav Petkov wrote:
> 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?

As I  understand it, the problem reproduces only on a 32bit host, which
also limits the guests to 32bit, at least when ran with KVM. This is
true even if a x86-64 qemu is used. This is also independent on whether
the host-cpu supports 64bit or not.


	Joerg


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