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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> 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?
> 

Add Yang who understands that detail better than me. :-)

Thanks
Kevin

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