linux-kernel - Re: KVM/KGDB integration

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Message-ID: <20131127100825.GR959@redhat.com>
Date:	Wed, 27 Nov 2013 12:08:25 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Dan Aloni <alonid@...atoscale.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	kgdb-bugreport@...ts.sourceforge.net, x86@...nel.org,
	pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, Jason Wessel <jason.wessel@...driver.com>
Subject: Re: KVM/KGDB integration

Copying KGDB maintainer to get some feedback.

On Tue, Nov 19, 2013 at 04:53:28PM +0200, Dan Aloni wrote:
> Hello,
> 
> The following two patches address an integration issue between KVM and
> KGDB. The issue described in the patches can be triggered with vanilla
> kernels that enable KGDB and KVM together on x86 (more specifically,
> we bump into this with Fedora's 3.11 kernel from FC19).
> 
> On a kernel enabled with KGDB, running with kvm-unit-tests should
> reproduce the issue. On VM hosts servers where an admin accidently
> left an active KGDB, and unprivilged guest might be able to bring
> the host down.
> 
> Patches apply to linux-next and earlier kernels.

--
			Gleb.
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