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| author | Pawan Gupta <pawan.kumar.gupta@linux.intel.com> | 2022-05-20 05:32:13 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-05-21 12:16:04 +0200 |
| commit | 8d50cdf8b8341770bc6367bce40c0c1bb0e1d5b3 (patch) | |
| tree | fa000ed5dd9092d29137ca27a2dddd4b350f2fdc /arch/x86/kernel/cpu/bugs.c | |
| parent | x86/speculation/mmio: Enable CPU Fill buffer clearing on idle (diff) | |
| download | linux-8d50cdf8b8341770bc6367bce40c0c1bb0e1d5b3.tar.xz linux-8d50cdf8b8341770bc6367bce40c0c1bb0e1d5b3.zip | |
x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data
Add the sysfs reporting file for Processor MMIO Stale Data
vulnerability. It exposes the vulnerability and mitigation state similar
to the existing files for the other hardware vulnerabilities.
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'arch/x86/kernel/cpu/bugs.c')
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 56d5dea5e128..38853077ca58 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1902,6 +1902,20 @@ static ssize_t tsx_async_abort_show_state(char *buf) sched_smt_active() ? "vulnerable" : "disabled"); } +static ssize_t mmio_stale_data_show_state(char *buf) +{ + if (mmio_mitigation == MMIO_MITIGATION_OFF) + return sysfs_emit(buf, "%s\n", mmio_strings[mmio_mitigation]); + + if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) { + return sysfs_emit(buf, "%s; SMT Host state unknown\n", + mmio_strings[mmio_mitigation]); + } + + return sysfs_emit(buf, "%s; SMT %s\n", mmio_strings[mmio_mitigation], + sched_smt_active() ? "vulnerable" : "disabled"); +} + static char *stibp_state(void) { if (spectre_v2_in_eibrs_mode(spectre_v2_enabled)) @@ -2002,6 +2016,9 @@ static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr case X86_BUG_SRBDS: return srbds_show_state(buf); + case X86_BUG_MMIO_STALE_DATA: + return mmio_stale_data_show_state(buf); + default: break; } @@ -2053,4 +2070,9 @@ ssize_t cpu_show_srbds(struct device *dev, struct device_attribute *attr, char * { return cpu_show_common(dev, attr, buf, X86_BUG_SRBDS); } + +ssize_t cpu_show_mmio_stale_data(struct device *dev, struct device_attribute *attr, char *buf) +{ + return cpu_show_common(dev, attr, buf, X86_BUG_MMIO_STALE_DATA); +} #endif |