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SubjectRe: [patch V2 2/2] x86/cpu: Implement CPU vulnerabilites sysfs functions
On Sun, Jan 07, 2018 at 10:48:01PM +0100, Thomas Gleixner wrote:
> Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and
> spectre_v2.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Thank you!
> ---
> arch/x86/Kconfig | 1 +
> arch/x86/kernel/cpu/bugs.c | 29 +++++++++++++++++++++++++++++
> 2 files changed, 30 insertions(+)
>
> --- 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
> --- 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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