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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

(please trim your quotes)

> 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?

Do you not need that stuff to handle MCEs during the live phase?

Specifically an MCE occurring on a page which is not in the current
batch at all can be handled safely during the live phase.

Ian.


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