x86/pti: Rename BUG_CPU_INSECURE to BUG_CPU_MELTDOWN

Use the name associated with the particular attack which needs page table
isolation for mitigation.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: David Woodhouse <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Jiri Koshina <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Andi Lutomirski  <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Turner <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801051525300.1724@nanos

Author: KAGA-KOKO

arch/x86/include/asm/cpufeatures.h

@@ -341,6 +341,6 @@
 #define X86_BUG_SWAPGS_FENCE		X86_BUG(11) /* SWAPGS without input dep on GS */
 #define X86_BUG_MONITOR			X86_BUG(12) /* IPI required to wake up remote CPU */
 #define X86_BUG_AMD_E400		X86_BUG(13) /* CPU is among the affected by Erratum 400 */
-#define X86_BUG_CPU_INSECURE		X86_BUG(14) /* CPU is insecure and needs kernel page table isolation */
+#define X86_BUG_CPU_MELTDOWN		X86_BUG(14) /* CPU is affected by meltdown attack and needs kernel page table isolation */
 
 #endif /* _ASM_X86_CPUFEATURES_H */

arch/x86/kernel/cpu/common.c

@@ -900,7 +900,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	setup_force_cpu_cap(X86_FEATURE_ALWAYS);
 
 	if (c->x86_vendor != X86_VENDOR_AMD)
-		setup_force_cpu_bug(X86_BUG_CPU_INSECURE);
+		setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
 
 	fpu__init_system(c);
 

arch/x86/mm/pti.c

@@ -56,13 +56,13 @@
 
 static void __init pti_print_if_insecure(const char *reason)
 {
-	if (boot_cpu_has_bug(X86_BUG_CPU_INSECURE))
+	if (boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
 		pr_info("%s\n", reason);
 }
 
 static void __init pti_print_if_secure(const char *reason)
 {
-	if (!boot_cpu_has_bug(X86_BUG_CPU_INSECURE))
+	if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
 		pr_info("%s\n", reason);
 }
 
@@ -96,7 +96,7 @@ void __init pti_check_boottime_disable(void)
 	}
 
 autosel:
-	if (!boot_cpu_has_bug(X86_BUG_CPU_INSECURE))
+	if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
 		return;
 enable:
 	setup_force_cpu_cap(X86_FEATURE_PTI);