Messages in this thread Patch in this message |  | | Date | Mon, 8 Jan 2018 02:17:01 -0800 | From | tip-bot for Thomas Gleixner <> | Subject | [tip:x86/pti] x86/cpu: Implement CPU vulnerabilites sysfs functions |
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Commit-ID: 61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 Gitweb: https://git.kernel.org/tip/61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 Author: Thomas Gleixner <tglx@linutronix.de> AuthorDate: Sun, 7 Jan 2018 22:48:01 +0100 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Mon, 8 Jan 2018 11:10:40 +0100
x86/cpu: Implement CPU vulnerabilites sysfs functions
Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and spectre_v2.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Linus Torvalds <torvalds@linuxfoundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: David Woodhouse <dwmw@amazon.co.uk> Link: https://lkml.kernel.org/r/20180107214913.177414879@linutronix.de
--- arch/x86/Kconfig | 1 + arch/x86/kernel/cpu/bugs.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index cd5199d..e23d21a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -89,6 +89,7 @@ config X86 select GENERIC_CLOCKEVENTS_MIN_ADJUST select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE + select GENERIC_CPU_VULNERABILITIES select GENERIC_EARLY_IOREMAP select GENERIC_FIND_FIRST_BIT select GENERIC_IOMAP diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index ba0b242..76ad6cb 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -10,6 +10,7 @@ */ #include <linux/init.h> #include <linux/utsname.h> +#include <linux/cpu.h> #include <asm/bugs.h> #include <asm/processor.h> #include <asm/processor-flags.h> @@ -60,3 +61,31 @@ void __init check_bugs(void) set_memory_4k((unsigned long)__va(0), 1); #endif } + +#ifdef CONFIG_SYSFS +ssize_t cpu_show_meltdown(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) + return sprintf(buf, "Not affected\n"); + if (boot_cpu_has(X86_FEATURE_PTI)) + return sprintf(buf, "Mitigation: PTI\n"); + return sprintf(buf, "Vulnerable\n"); +} + +ssize_t cpu_show_spectre_v1(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1)) + return sprintf(buf, "Not affected\n"); + return sprintf(buf, "Vulnerable\n"); +} + +ssize_t cpu_show_spectre_v2(struct device *dev, + struct device_attribute *attr, char *buf) +{ + if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2)) + return sprintf(buf, "Not affected\n"); + return sprintf(buf, "Vulnerable\n"); +} +#endif
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