Re: guest reboot error

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Dong, Eddie wrote:
>> BTW, I downloaded KVM-36 with REHL5U 32e guest, reboot doesn't work
>> either. But if I use no-kvm option, it can.
>> So I would like to know which release is the latest known working
>> tree for "reboot". 
>>
>>     
> More update:
> 	Using today's master, without any patch, reboot works!!! 
> 	It could be explained that at reboot time, the eflag.IF is
> cleared, 
> so no matter how PIC/APIC beahivors at that stage, it doesn't matter. 
> Later on, guest will reset those chips and then keep forwarding... 
> Some other patches fixed the issue from KVM-36, or anybody has more
> finding?
>
> 	It is good that I don't need to push the kernel device reset
> patch out that soon, 
> but we still need to do so for a graceful reset especially kernel
> devices need to be reseted since
>   

Yes, that patch is needed.  I thought of another way to do it: have a 
single vm ioctl reset, which can set a reset bit in all vcpu->requests 
and then kick the vcpus.  When the vcpus execute, they'll check the bit 
and reset the cpu and lapic then; no locking needed.


-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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