Re: [Xen-devel] [PATCH V4] X86/vMCE: handle broken page with regard to migration

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 05/12/12 15:57, Liu, Jinsong wrote:
> More simply, we can remove not only step #8 for last iteration check, but also 
> the action to 'mark broken page to dirty bitmap':
> In any iteration, there is a key point #4, if vmce occur before #4 it will 
> transfer proper pfn_type/pfn_number and (xl migration) will not access broken 
> page (if guest access the broken page again it will be killed by hypervisor), 
> if vmce occur after #4 system will crash and no need care migration any more.
>
> So we can go back to the original patch which used to handle 'vmce occur before 
> migration' and entirely don't need add specific code to handle 'vmce occur 
> during migration', since it in fact has handled both cases (and simple). 
> Thoughts?
I thought part of the point of that was to have a consistent behavior 
from the presented virtual hardware -- i.e,. if the guest OS receives a 
vMCE, and subsequently touches that page, it should get an SRAR?  Is 
that important or not?
 -George

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