Dong, Eddie wrote:
> [EMAIL PROTECTED] 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.


Can you add code to kvmctl.c to dump the contents of that memory region
at the time of failure?


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.


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