Re: Live migration leaves page tables read-only?

[John Byrne <john.l.byrne@hp.com>]

I forgot to mention that a very simple test case I wrote using shared 
memory and the mprotect call didn't fail. So, the only test case I have 
at the moment is to run SAP.

John Byrne

John Byrne wrote:
> 
> I have been trying to debug a problem live-migrating SAP on Xen-3.0.3 
> x86-64 (I also tested Xen-unstable changeset 12548) without success.
> 
> SAP seems to run fine on a given host; live-migrating it to another host 
> causes the guest to almost immediately panic in the mprotect() call in 
> the change_pte_range() routine in the set_pte_at() macro because the 
> page table page it is trying to update is write-protected.
> 
> My attempts at understanding where this is coming from have come to 
> naught. Any help in running this down would be appreciated. I am 
> perfectly willing/able to write some debugging code if I am given a few 
> clues what to look for.
> 
> Thanks,
> 
> John Byrne
> 
> 
> 
> 
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