| From | Ben Hutchings <> | Date | Mon, 12 Mar 2018 03:03:34 +0000 | Subject | [PATCH 3.2 044/104] x86/cpufeatures: Add X86_BUG_SPECTRE_V[12] |
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3.2.101-rc1 review patch. If anyone has any objections, please let me know.
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From: David Woodhouse <dwmw@amazon.co.uk>
commit 99c6fa2511d8a683e61468be91b83f85452115fa upstream.
Add the bug bits for spectre v1/2 and force them unconditionally for all cpus.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: gnomes@lxorguk.ukuu.org.uk Cc: Rik van Riel <riel@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Jiri Kosina <jikos@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Kees Cook <keescook@google.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org> Cc: Paul Turner <pjt@google.com> Link: https://lkml.kernel.org/r/1515239374-23361-2-git-send-email-dwmw@amazon.co.uk [bwh: Backported to 3.2: assign the first available bug numbers] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- arch/x86/include/asm/cpufeature.h | 2 ++ arch/x86/kernel/cpu/common.c | 3 +++ 2 files changed, 5 insertions(+)
--- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -215,6 +215,8 @@ #define X86_BUG(x) (NCAPINTS*32 + (x)) #define X86_BUG_CPU_MELTDOWN X86_BUG(0) /* CPU is affected by meltdown attack and needs kernel page table isolation */ +#define X86_BUG_SPECTRE_V1 X86_BUG(1) /* CPU is affected by Spectre variant 1 attack with conditional branches */ +#define X86_BUG_SPECTRE_V2 X86_BUG(2) /* CPU is affected by Spectre variant 2 attack with indirect branches */ #if defined(__KERNEL__) && !defined(__ASSEMBLY__) --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -770,6 +770,9 @@ static void __init early_identify_cpu(st 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); } void __init early_cpu_init(void)
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