linux-kernel - [PATCH 3/3] x86/pti: Call pti_clone_kernel_text() from pti

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Date:   Tue,  3 Jul 2018 13:52:26 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     hpa@...or.com, Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 3/3] x86/pti: Call pti_clone_kernel_text() from pti_init()

From: Joerg Roedel <jroedel@...e.de>

The pti_init() function is now called late enough for
pti_clone_kernel_text(), so call it directly from there.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 arch/x86/include/asm/pti.h | 2 --
 arch/x86/mm/init_64.c      | 6 ------
 arch/x86/mm/pti.c          | 3 ++-
 3 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/pti.h b/arch/x86/include/asm/pti.h
index 38a17f1..0b5ef05 100644
--- a/arch/x86/include/asm/pti.h
+++ b/arch/x86/include/asm/pti.h
@@ -6,10 +6,8 @@
 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 extern void pti_init(void);
 extern void pti_check_boottime_disable(void);
-extern void pti_clone_kernel_text(void);
 #else
 static inline void pti_check_boottime_disable(void) { }
-static inline void pti_clone_kernel_text(void) { }
 #endif
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index a688617..9b19f9a 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1291,12 +1291,6 @@ void mark_rodata_ro(void)
 			(unsigned long) __va(__pa_symbol(_sdata)));
 
 	debug_checkwx();
-
-	/*
-	 * Do this after all of the manipulation of the
-	 * kernel text page tables are complete.
-	 */
-	pti_clone_kernel_text();
 }
 
 int kern_addr_valid(unsigned long addr)
diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
index 8a80522..dd344f7 100644
--- a/arch/x86/mm/pti.c
+++ b/arch/x86/mm/pti.c
@@ -438,7 +438,7 @@ static inline bool pti_kernel_image_global_ok(void)
  * For some configurations, map all of kernel text into the user page
  * tables.  This reduces TLB misses, especially on non-PCID systems.
  */
-void pti_clone_kernel_text(void)
+static void pti_clone_kernel_text(void)
 {
 	/*
 	 * rodata is part of the kernel image and is normally
@@ -499,6 +499,7 @@ void pti_init(void)
 	pti_set_kernel_image_nonglobal();
 	/* Replace some of the global bits just for shared entry text: */
 	pti_clone_entry_text();
+	pti_clone_kernel_text();
 	pti_setup_espfix64();
 	pti_setup_vsyscall();
 }
-- 
2.7.4