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

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Date:	Thu, 18 Jul 2013 03:52:43 +0800
From:	Xiao Guangrong <xiaoguangrong.eric@...il.com>
To:	Gleb Natapov <gleb@...hat.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 Jul 18, 2013, at 3:31 AM, Gleb Natapov <gleb@...hat.com> wrote:

> 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?

Yes. The issue is gone after update the code. Thank you, Gleb!

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