[PATCH 3.16 71/86] x86/speculation/mds: Add sysfs reporting for MDS

Ben Hutchings
2019-05-16T16:03:22Z

From: Thomas Gleixner <tglx@linutronix.de>

commit 8a4b06d391b0a42a373808979b5028f5c84d9c6a upstream.

Add the sysfs reporting file for MDS. It exposes the vulnerability and
mitigation state similar to the existing files for the other speculative
hardware vulnerabilities.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jon Masters <jcm@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
[bwh: Backported to 3.16:
- Test x86_hyper instead of using hypervisor_is_type()
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -231,6 +231,7 @@ What: /sys/devices/system/cpu/vulnerabi
/sys/devices/system/cpu/vulnerabilities/spectre_v2
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass
/sys/devices/system/cpu/vulnerabilities/l1tf
+ /sys/devices/system/cpu/vulnerabilities/mds
Date: January 2018
Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Description: Information about CPU vulnerabilities
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -24,6 +24,7 @@
#include <asm/msr.h>
#include <asm/paravirt.h>
#include <asm/alternative.h>
+#include <asm/hypervisor.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/intel-family.h>
@@ -1131,6 +1132,24 @@ static void __init l1tf_select_mitigatio

#ifdef CONFIG_SYSFS

+static ssize_t mds_show_state(char *buf)
+{
+#ifdef CONFIG_HYPERVISOR_GUEST
+ if (x86_hyper) {
+ return sprintf(buf, "%s; SMT Host state unknown\n",
+ mds_strings[mds_mitigation]);
+ }
+#endif
+
+ if (boot_cpu_has(X86_BUG_MSBDS_ONLY)) {
+ return sprintf(buf, "%s; SMT %s\n", mds_strings[mds_mitigation],
+ sched_smt_active() ? "mitigated" : "disabled");
+ }
+
+ return sprintf(buf, "%s; SMT %s\n", mds_strings[mds_mitigation],
+ sched_smt_active() ? "vulnerable" : "disabled");
+}
+
static char *stibp_state(void)
{
if (spectre_v2_enabled == SPECTRE_V2_IBRS_ENHANCED)
@@ -1193,6 +1212,9 @@ static ssize_t cpu_show_common(struct de
return sprintf(buf, "Mitigation: Page Table Inversion\n");
break;

+ case X86_BUG_MDS:
+ return mds_show_state(buf);
+
default:
break;
}
@@ -1224,4 +1246,9 @@ ssize_t cpu_show_l1tf(struct device *dev
{
return cpu_show_common(dev, attr, buf, X86_BUG_L1TF);
}
+
+ssize_t cpu_show_mds(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return cpu_show_common(dev, attr, buf, X86_BUG_MDS);
+}
#endif
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -450,11 +450,18 @@ ssize_t __weak cpu_show_l1tf(struct devi
return sprintf(buf, "Not affected\n");
}

+ssize_t __weak cpu_show_mds(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Not affected\n");
+}
+
static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL);
static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL);
static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL);
static DEVICE_ATTR(spec_store_bypass, 0444, cpu_show_spec_store_bypass, NULL);
static DEVICE_ATTR(l1tf, 0444, cpu_show_l1tf, NULL);
+static DEVICE_ATTR(mds, 0444, cpu_show_mds, NULL);

static struct attribute *cpu_root_vulnerabilities_attrs[] = {
&dev_attr_meltdown.attr,
@@ -462,6 +469,7 @@ static struct attribute *cpu_root_vulner
&dev_attr_spectre_v2.attr,
&dev_attr_spec_store_bypass.attr,
&dev_attr_l1tf.attr,
+ &dev_attr_mds.attr,
NULL
};

--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -49,6 +49,8 @@ extern ssize_t cpu_show_spec_store_bypas
struct device_attribute *attr, char *buf);
extern ssize_t cpu_show_l1tf(struct device *dev,
struct device_attribute *attr, char *buf);
+extern ssize_t cpu_show_mds(struct device *dev,
+ struct device_attribute *attr, char *buf);

#ifdef CONFIG_HOTPLUG_CPU
extern void unregister_cpu(struct cpu *cpu);