Re: [Xen-devel] [PATCH] x86/EPT: flush cache when (potentially) limiting cachability

["Liu, SongtaoX" <songtaox.liu@xxxxxxxxx>]

> 
> >>> On 17.06.14 at 10:33, <songtaox.liu@xxxxxxxxx> wrote:
> > Full L0 serial log as attached, it was from L0 boot to L2 guest creation.
> > After creating L2, it takes nearly 15 minutes to print the last line of "
> > (XEN) chg[040000] d1 [hvm_set_guest_pat+0xad/0xb9]".
> > No other logs printed out in 20 minutes.
> 
> So then I suppose the problem are the two hvm_set_guest_pat() invocations
> from vvmx.c. Thinking about it, the call from that function to
> memory_type_changed() seems unnecessary - PAT_CR contents don't
> influence the decision taken by epte_get_entry_emt(). Tim, Kevin, you had
> looked at the original patch - would you agree?
> Songtao - mind giving removal of that call a try to at least verify the 
> theory?
> 
I guess your meaning is to remove flush_all(FLUSH_CACHE) in function 
memory_type_changed.
After removing it, the L2 guest could boot well, it works.

Regards
Songtao

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