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 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.


> 
> 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,
Jin Dongming
> 
> Best Regards,
> Huang Ying
> 
> 
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