linux-kernel - Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes) causes hang

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Date:	Wed, 17 Jul 2013 22:31:00 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Xiao Guangrong <xiaoguangrong.eric@...il.com>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes)
 causes hang

On Thu, Jul 18, 2013 at 03:07:11AM +0800, Xiao Guangrong wrote:
> Ouch!
> 
> The guest is hang when boot from ubuntu iso, i bisected the code and found it is caused by:
> 
> cad55f1aed000db46dfd1b5706707f33624d8604 is the first bad commit
> commit cad55f1aed000db46dfd1b5706707f33624d8604
> Author: Cornelia Huck <cornelia.huck@...ibm.com>
> Date:   Wed Jul 3 16:30:53 2013 +0200
> 
>     KVM: kvm-io: support cookies
>     
>     Add new functions kvm_io_bus_{read,write}_cookie() that allows users of
>     the kvm io infrastructure to use a cookie value to speed up lookup of a
>     device on an io bus.
>     
>     Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
>     Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> 
> Now, i have reset the code behind this commit and continue to install the guest…...
> 
You are on an old queue branch (the commit was never in next). I fixed it not long time ago. Can you
pull?

--
			Gleb.
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