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Date: Thu, 9 Mar 2017 15:26:02 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Borislav Petkov <bp@...e.de> Cc: Daniel Borkmann <daniel@...earbox.net>, Thomas Gleixner <tglx@...utronix.de>, Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>, Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>, Fengguang Wu <fengguang.wu@...el.com>, Network Development <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>, ast@...com, "the arch/x86 maintainers" <x86@...nel.org>, "David S. Miller" <davem@...emloft.net> Subject: Re: [net/bpf] 3051bf36c2 BUG: unable to handle kernel paging request at 0000a7cf On Thu, Mar 9, 2017 at 2:48 PM, Borislav Petkov <bp@...e.de> wrote: > > I guess we could return to doing boot_cpu_has() in __flush_tlb_all() > then. I mean, the timing-sensitivity argument is meh - killing global > TLB entries a bit faster doesn't bring me a whole lot when I have to go > and walk pagetable and reestablish them, which is the real price to pay > anyway. So should all of commit ("c109bf95992b x86/cpufeature: Remove cpu_has_pge") just be reverted (and then marked for stable)? Or do we have some alternate plan? This has apparently been going on for a long while (it got merged into 4.7), but presumably it only actually _matters_ if lguest is enabled and used and we've triggered that lguest_arch_host_init() code. Maybe it's the lguest games with PGE that need to be removed? Linus
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