From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 50921] kvm hangs booting Windows 2000
Date: Mon, 26 Nov 2012 20:29:28 +0000 (UTC)
Message-ID: <20121126202928.65E7411FB6C@bugzilla.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=50921
--- Comment #15 from Anonymous Emailer 2012-11-26 20:29:28 ---
Reply-To: xiaoguangrong@linux.vnet.ibm.com
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@bugzilla.kernel.org wrote:
>> https://bugzilla.kernel.org/show_bug.cgi?id=50921
>>
>>
>>
>>
>>
>> --- Comment #5 from Lucio Crusca 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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