linux-kernel - Re: [BUG] kvm crashes in 2.6.28-rc6-00007-ged31348

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Message-ID: <4935A0FF.7070105@redhat.com>
Date:	Tue, 02 Dec 2008 22:56:31 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Steven Rostedt <srostedt@...hat.com>
CC:	Luis Henriques <henrix@...o.pt>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [BUG] kvm crashes in 2.6.28-rc6-00007-ged31348

Steven Rostedt wrote:

  

>> In arch/x86/kvm/svm.c, function svm_vcpu_run(), everything between the 
>> vmrun instruction and the call to load_host_msrs() is executed without a 
>> live pda, so no smp_processor_id().  Could easily be fixed by 
>> rearranging things.
>>     
>
> That would be best, but if you have trouble, you could surround the
> trouble area with a: tracing_stop(); tracing_start(); That will prevent
> tracing within those locations. The function tracer will still be
> called, but it will exit the function without doing anything else.
>
> Note: that stops tracing on all CPUS, not just the CPU that called it.
>   

The vmrun instruction can execute for a long time (hours, if you have a 
dyntick kernel and no timers scheduled), so that's less than optimal.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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