Date: Tue, 23 Jan 2018 18:36:54 +0000 From: Alan Cox <alan@...ux.intel.com> To: Linus Torvalds <torvalds@...ux-foundation.org>, 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>, 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 > And if we ever get CPU's that have this all fixed, we can re-visit > introducing the fastpath. But this is all very messy and it doesn't > seem worth it right now. We already have CPUs it doesn't affect - older Atom for one and I believe some or all of the VIA ones (still trying to get a definitive confirmation). Alan
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