[Bug 50921] kvm hangs booting Windows 2000

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https://bugzilla.kernel.org/show_bug.cgi?id=50921





--- Comment #15 from Anonymous Emailer <anonymous@xxxxxxxxxxxxxxxxxxxx>  2012-11-26 20:29:28 ---
Reply-To: xiaoguangrong@xxxxxxxxxxxxxxxxxx

Sorry, forgot to CC Lucio Crusca.

On 11/27/2012 04:09 AM, Xiao Guangrong wrote:
> On 11/24/2012 09:44 PM, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
>> https://bugzilla.kernel.org/show_bug.cgi?id=50921
>>
>>
>>
>>
>>
>> --- Comment #5 from Lucio Crusca <lucio@xxxxxxxxxx>  2012-11-24 13:44:16 ---
>> Here the first tests results:
>>
>> vbox modules do not make a difference (tried rmmod vboxpci vboxnetadp
>> vboxnetflt vboxdrv and then kvm ...).
>>
>> The trace.dat is about 60M, I could upload it somewhere, however I tried
>> looking at it and I'm reasonably sure it hangs here:
>>
>> $ trace-cmd report | grep 125\\.332 | tail
>>              kvm-6588  [000]   125.332264: kvm_entry:            vcpu 0
>>              kvm-6588  [000]   125.332264: kvm_emulate_insn:     10000:44f8: 75
>> 27
> 
> Hmm... no 'kvm_exit' message. It looks like the infinite loop is caused by:
> 
> |	/* Don't enter VMX if guest state is invalid, let the exit handler
> |	   start emulation until we arrive back to a valid state */
> |	if (vmx->emulation_required && emulate_invalid_guest_state)
> |		return;
> 
> (vmx_vcpu_run in arch/x86/kvm/vmx.c)
> 
> And, i noticed 'ept' is not supported on your box, that means
> 'enable_unrestricted_guest' is disabled. I guess something was wrong
> when emulate big real mode.
> 
> Could you reload kvm-intel.ko with 'emulate_invalid_guest_state = 0',
> and see what will happen.
> 
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>

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