Re: [PATCH] Add function for clearing the requested VCPUs' mce registers.

[Jin Dongming <jin.dongming@np.css.fujitsu.com>]

Hi, Huang-san

(2010/11/25 14:44), Huang Ying wrote:
> On Thu, 2010-11-25 at 13:30 +0800, Jin Dongming wrote:
>> Hi, Huang-san
>>
>> (2010/11/25 10:27), Huang Ying wrote:
>>> Hi, Dongming,
>>>
>>> On Thu, 2010-11-25 at 09:14 +0800, Jin Dongming wrote:
>>>> In some case of mce test, the injected data can be remained
>>>> in the registers and ca affect to the result of following test cases.
>>>> So add codes for clearing mce registers of given VCPU.
>>>>
>>>> mce registers of give VCPU could be cleared from kernel by calling
>>>> the function in this patch.  What need to be paid attention is that
>>>> the status and mcg_status of mce must be set with 0. If not, mce
>>>> registers will not be cleared.
>>>
>>> Why do you need this? To use "mce=3" in guest Linux MCE testing?
>> When I set fake_panic==1 on Guest OS and tested mce via qemu-monitor,
>> I got the wrong result sometimes. The reason why I got the wrong result
>> was that mce registers were not cleared. So I made this patch.
> 
> This can be done in QEMU via KVM_SET_MSRS too.
Yes, it could be done in Guest OS with APL. So I will cancel this patch.

Best Regards,
Jin Dongming
>  
>>> If it is, why not use full reboot? MCE registers are not cleared in real
>>> machine too. And it is not so pain to reboot the guest.
>> Though we know that mce registers could be cleared by rebooting the Guest
>> Machine and the reboot of Guest Machine could save much more time than
>> the reboot of Host Machine, it is still slower than setting
>> fake_panic==1 to mce test.
> 
> Best Regards,
> Huang Ying
> 
> 
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