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Date: Tue, 31 Oct 2017 18:08:33 -0700 From: Dave Hansen <dave.hansen@...ux.intel.com> To: Brian Gerst <brgerst@...il.com> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at, michael.schwarz@...k.tugraz.at, Andy Lutomirski <luto@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook <keescook@...gle.com>, hughd@...gle.com, the arch/x86 maintainers <x86@...nel.org> Subject: Re: [PATCH 01/23] x86, kaiser: prepare assembly for entry/exit CR3 switching On 10/31/2017 05:43 PM, Brian Gerst wrote: >> >> + RESTORE_CR3 save_reg=%r14 >> + >> testl %ebx, %ebx /* swapgs needed? */ >> jnz nmi_restore >> nmi_swapgs: >> _ > This all needs to be conditional on a config option. Something with > this amount of performance impact needs to be 100% optional. The 07/23 patch does just this. I should have at least called that out in the description.
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