Date: Thu, 25 Jan 2018 13:20:49 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Andy Lutomirski <luto@...nel.org> Cc: "the arch/x86 maintainers" <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Alan Cox <alan@...ux.intel.com>, Jann Horn <jannh@...gle.com>, Samuel Neves <samuel.c.p.neves@...il.com>, Dan Williams <dan.j.williams@...el.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Borislav Petkov <bp@...en8.de> Subject: Re: [PATCH] x86/retpoline/entry: Disable the entire SYSCALL64 fast path with retpolines on On Thu, Jan 25, 2018 at 1:08 PM, Andy Lutomirski <luto@...nel.org> wrote: > > With retpoline, the retpoline in the trampoline sucks. I don't need > perf for that -- I've benchmarked it both ways. It sucks. I'll fix > it, but it'll be kind of complicated. Ahh, I'd forgotten about that (and obviously didn't see it in the profiles). But yeah, that is fixable even if it does require a page per CPU. Or did you have some clever scheme in mind? But that's independent of the slow/fast path. Linus
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