Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf

[Thomas Gleixner]

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