| From 61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 Mon Sep 17 00:00:00 2001 |
| From: Thomas Gleixner <tglx@linutronix.de> |
| Date: Sun, 7 Jan 2018 22:48:01 +0100 |
| Subject: x86/cpu: Implement CPU vulnerabilites sysfs functions |
| |
| From: Thomas Gleixner <tglx@linutronix.de> |
| |
| commit 61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 upstream. |
| |
| 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 |
| Signed-off-by: Razvan Ghitulete <rga@amazon.de> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| arch/x86/Kconfig | 1 + |
| arch/x86/kernel/cpu/bugs.c | 29 +++++++++++++++++++++++++++++ |
| 2 files changed, 30 insertions(+) |
| |
| --- a/arch/x86/Kconfig |
| +++ b/arch/x86/Kconfig |
| @@ -64,6 +64,7 @@ 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 |
| --- a/arch/x86/kernel/cpu/bugs.c |
| +++ b/arch/x86/kernel/cpu/bugs.c |
| @@ -9,6 +9,7 @@ |
| */ |
| #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> |
| @@ -67,3 +68,31 @@ 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_KAISER)) |
| + 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 |