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x86/intel_rdt: Disable PMU access

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Peter is objecting to the direct PMU access in RDT. Right now the PMU usage
is broken anyway as it is not coordinated with perf.

Until this discussion settled, disable the PMU mechanics by simply
rejecting the type '2' measurement in the resctrl file.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: vikas.shivappa@linux.intel.com
CC: gavin.hindman@intel.com
Cc: jithu.joseph@intel.com
Cc: hpa@zytor.com
This commit is contained in:
Thomas Gleixner 2018-08-03 13:06:35 +02:00
parent 2989360d9c
commit 4a7a54a55e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
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@ -1171,7 +1171,7 @@ static ssize_t pseudo_lock_measure_trigger(struct file *file,
buf[buf_size] = '\0';
ret = kstrtoint(buf, 10, &sel);
if (ret == 0) {
if (sel != 1 && sel != 2)
if (sel != 1)
return -EINVAL;
ret = debugfs_file_get(file->f_path.dentry);
if (ret)