On Thu, 9 Mar 2017, Daniel Borkmann wrote:
> With regard to CPA_FLUSHTLB that Linus mentioned, when I investigated
> code paths in change_page_attr_set_clr(), I did see that CPA_FLUSHTLB
> was set each time we switched attrs and a cpa_flush_range() was
> performed (with the correct number of pages and cache set to 0). That
> would be a __flush_tlb_all() eventually.
>
> Hmm, it indeed might seem likely that this could be an emulation bug.
Which variant of __flush_tlb_all() is used when the test fails?
Check for the following flags in /proc/cpuinfo: pge invpcid
Thanks,
tglx
