linux-kernel - Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from userspace page tables, core patch

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Message-ID: <20171127153907.b2nx4a5v3zgxqmyh@hirez.programming.kicks-ass.net>
Date:   Mon, 27 Nov 2017 16:39:07 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from
 userspace page tables, core patch


So I had the problem that I could not tell if my shiny new kernel had
this brand spanking awesome feature enabled or not.

Do we want something like so?

---
 arch/x86/mm/kaiser.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/kaiser.c b/arch/x86/mm/kaiser.c
index 0ff502fa655b..655349e0b5fb 100644
--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -425,6 +425,8 @@ void __init kaiser_init(void)
 	if (!kaiser_enabled)
 		return;
 
+	pr_info("All your KAISER are belong to us.\n");
+
 	kaiser_init_all_pgds();
 
 	for_each_possible_cpu(cpu) {