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Date: Wed, 1 Nov 2017 22:01:28 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Dave Hansen <dave.hansen@...ux.intel.com> cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at, michael.schwarz@...k.tugraz.at, luto@...nel.org, torvalds@...ux-foundation.org, keescook@...gle.com, hughd@...gle.com, x86@...nel.org Subject: Re: [PATCH 01/23] x86, kaiser: prepare assembly for entry/exit CR3 switching On Tue, 31 Oct 2017, Dave Hansen wrote: > > + pushq %rdi > + SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi > + popq %rdi Can you please have a macro variant which does: SWITCH_TO_KERNEL_CR3_PUSH reg=%rdi So the pushq/popq is inside the macro. This has two reasons: 1) If KAISER=n the pointless pushq/popq go away 2) We need a boottime switch for that stuff, so we better have all related code in the various macros in order to patch it in/out. Also, please wrap these macros in #ifdef KAISER right away and provide the stubs as well. It does not make sense to have them in patch 7 when patch 1 introduces them. Aside of Boris comments this looks about right. Thanks, tglx
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