linux-kernel - [tip:x86/pti] x86/cpufeatures: Add X86_BUG_SPECTRE

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Date:   Sat, 6 Jan 2018 13:05:08 -0800
From:   tip-bot for David Woodhouse <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     pjt@...gle.com, keescook@...gle.com, tglx@...utronix.de,
        mingo@...nel.org, jikos@...nel.org, hpa@...or.com,
        dave.hansen@...el.com, peterz@...radead.org, ak@...ux.intel.com,
        gregkh@...ux-foundation.org, riel@...hat.com,
        linux-kernel@...r.kernel.org, luto@...capital.net,
        torvalds@...ux-foundation.org, dwmw@...zon.co.uk,
        tim.c.chen@...ux.intel.com
Subject: [tip:x86/pti] x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]

Commit-ID:  99c6fa2511d8a683e61468be91b83f85452115fa
Gitweb:     https://git.kernel.org/tip/99c6fa2511d8a683e61468be91b83f85452115fa
Author:     David Woodhouse <dwmw@...zon.co.uk>
AuthorDate: Sat, 6 Jan 2018 11:49:23 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 6 Jan 2018 21:57:19 +0100

x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]

Add the bug bits for spectre v1/2 and force them unconditionally for all
cpus.

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: gnomes@...rguk.ukuu.org.uk
Cc: Rik van Riel <riel@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jiri Kosina <jikos@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Kees Cook <keescook@...gle.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...ux-foundation.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/1515239374-23361-2-git-send-email-dwmw@amazon.co.uk
---
 arch/x86/include/asm/cpufeatures.h | 2 ++
 arch/x86/kernel/cpu/common.c       | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 21ac898..1641c2f 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -342,5 +342,7 @@
 #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_MELTDOWN		X86_BUG(14) /* CPU is affected by meltdown attack and needs kernel page table isolation */
+#define X86_BUG_SPECTRE_V1		X86_BUG(15) /* CPU is affected by Spectre variant 1 attack with conditional branches */
+#define X86_BUG_SPECTRE_V2		X86_BUG(16) /* CPU is affected by Spectre variant 2 attack with indirect branches */
 
 #endif /* _ASM_X86_CPUFEATURES_H */
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 2d3bd22..372ba3f 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -902,6 +902,9 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	if (c->x86_vendor != X86_VENDOR_AMD)
 		setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
 
+	setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
+	setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
+
 	fpu__init_system(c);
 
 #ifdef CONFIG_X86_32