Re: guest reboot error

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

Dong, Eddie wrote:
> Avi Kivity wrote:
>   
>> Dong, Eddie wrote:
>>     
>>> kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org wrote:
>>>
>>>       
>>>> I try to implement the guest reboot support, but I found there is an
>>>> stranger #PF VM Exit in guest real mode cs:ip=f000:10000 which is
>>>> problemtic and current shadow won;t handle. I then try to
>>>> use -no-kvm-irqchip and get same error.
>>>>
>>>> Can somebody give me more information if you ever successfully
>>>> run it before.
>>>> thx,eddie
>>>>
>>>>
>>>>         
>>> correction:  It is GP fault, not #PF fault.
>>>
>>>
>>>       
>> Looks like the bios code was overwritten. If the reboot vector at
>> f000:fff0 was zeroed out, kvm would just execute a bunch of two-byte
>> instructions eventually leading to rip = 10000 which is illegal for
>> vm8086 mode. 
>>
>>
>>     
> 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".
>
>   

Reboot behaves differently for different guests... we have a regression 
for Windows XP ACPI HAL (I'm quite sure kvm-36 used to work), but maybe 
not for RHEL 5 i386.


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


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