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Message-Id: <20180107210716.900785440@linutronix.de>
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Date: Sun, 07 Jan 2018 21:57:51 +0100
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@alien8.de>,
        David Woodhouse <dwmw@amazon.co.uk>,
        "Hansen, Dave" <dave.hansen@intel.com>
Subject: [patch 2/2] x86/cpu: Implement CPU vulnerabilites sysfs functions
References: <20180107205749.938016669@linutronix.de>
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 filename=x86-cpu--Implement-CPU-vulnerabilites-sysfs-functions.patch
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Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and
spectre_v2.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 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 snprintf(buf, PAGE_SIZE - 2, "Not affected\n");
+	if (boot_cpu_has(X86_FEATURE_PTI))
+		return snprintf(buf, PAGE_SIZE - 2, "Mitigation: PTI\n");
+	return snprintf(buf, PAGE_SIZE - 2, "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 snprintf(buf, PAGE_SIZE - 2, "Not affected\n");
+	return snprintf(buf, PAGE_SIZE - 2, "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 snprintf(buf, PAGE_SIZE - 2, "Not affected\n");
+	return snprintf(buf, PAGE_SIZE - 2, "Vulnerable\n");
+}
+#endif