Re: [Xen-devel] Nested EPT flushes on p2m change?

["Li, Liang Z" <liang.z.li@xxxxxxxxx>]

> Tian, Kevin wrote on 2015-04-03:
> >> From: Tim Deegan [mailto:tim@xxxxxxx]
> >> Sent: Thursday, March 26, 2015 7:10 PM
> >>
> >> Hi, VMX maintainers,
> >>
> >> I was looking at the nested EPT code while following up on Ed's email
> >> about altp2m design, and I can't see where nested-EPT entries get
> >> removed when a host EPT entry is removed/changed.
> >>
> >> On nested NPT, this is handled in hap_write_p2m_entry(), which
> >> detects that the domain has nested p2ms and calls
> >> p2m_flush_nestedp2m() if necessary.
> >>
> >> But nested EPT doesn't use the ->write_p2m_entry() hook to update
> >> entries, it uses atomic_write_ept_entry() instead.  AFAICS the only
> >> flushing done on that path is ept_sync_domain(), which doesn't do
> >> anything about nested p2ms.
> >>
> >> Am I forgetting something?
> 
> It looks like you are right. The original nested EPT doesn't consider it.
> 

I will take a look. If it's an issue, I will try to fix it.

Liang

> CC Xiantao who is the author of the nested EPT.
> 
> >>
> >
> > Add Yang who understands that detail better than me. :-)
> >
> > Thanks
> > Kevin
> 
> 
> Best regards,
> Yang


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