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Date:   Thu, 9 Mar 2017 14:10:46 +0100 (CET)
From:   Thomas Gleixner <>
To:     Daniel Borkmann <>
cc:     Kees Cook <>,
        Laura Abbott <>,
        Linus Torvalds <>,
        Ingo Molnar <>, Peter Anvin <>,
        Fengguang Wu <>,
        Network Development <>,
        LKML <>, LKP <>,, the arch/x86 maintainers <>,
        "David S. Miller" <>
Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request
 at 0000a7cf

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



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