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forked fromtorvalds/linux

Commit61dc0f5

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x86/cpu: Implement CPU vulnerabilites sysfs functions
Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 andspectre_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
1 parent87590ce commit61dc0f5

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‎arch/x86/Kconfig‎

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@@ -89,6 +89,7 @@ config X86
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select GENERIC_CLOCKEVENTS_MIN_ADJUST
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select GENERIC_CMOS_UPDATE
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select GENERIC_CPU_AUTOPROBE
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select GENERIC_CPU_VULNERABILITIES
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select GENERIC_EARLY_IOREMAP
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select GENERIC_FIND_FIRST_BIT
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select GENERIC_IOMAP

‎arch/x86/kernel/cpu/bugs.c‎

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@@ -10,6 +10,7 @@
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*/
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#include<linux/init.h>
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#include<linux/utsname.h>
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#include<linux/cpu.h>
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#include<asm/bugs.h>
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#include<asm/processor.h>
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#include<asm/processor-flags.h>
@@ -60,3 +61,31 @@ void __init check_bugs(void)
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set_memory_4k((unsigned long)__va(0),1);
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#endif
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}
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#ifdefCONFIG_SYSFS
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ssize_tcpu_show_meltdown(structdevice*dev,
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structdevice_attribute*attr,char*buf)
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{
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if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
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returnsprintf(buf,"Not affected\n");
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if (boot_cpu_has(X86_FEATURE_PTI))
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returnsprintf(buf,"Mitigation: PTI\n");
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returnsprintf(buf,"Vulnerable\n");
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}
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ssize_tcpu_show_spectre_v1(structdevice*dev,
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structdevice_attribute*attr,char*buf)
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{
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if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
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returnsprintf(buf,"Not affected\n");
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returnsprintf(buf,"Vulnerable\n");
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}
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ssize_tcpu_show_spectre_v2(structdevice*dev,
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structdevice_attribute*attr,char*buf)
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{
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if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2))
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returnsprintf(buf,"Not affected\n");
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returnsprintf(buf,"Vulnerable\n");
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}
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#endif

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