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

Avi Kivity
2008-12-02T20:56:31Z

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.