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Subject[tip:x86/cache] x86/intel_rdt/cqm: Clear the default RMID during hotcpu
Commit-ID:  eda61c265f3656be8345fdf0334b3a77829437fc
Gitweb: http://git.kernel.org/tip/eda61c265f3656be8345fdf0334b3a77829437fc
Author: Vikas Shivappa <vikas.shivappa@linux.intel.com>
AuthorDate: Wed, 9 Aug 2017 11:46:33 -0700
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 14 Aug 2017 11:47:46 +0200

x86/intel_rdt/cqm: Clear the default RMID during hotcpu

The user configured per cpu default RMID is not cleared during cpu
hotplug. This may lead to incorrect RMID values after a cpu goes offline
and again comes back online. Clear the per cpu default RMID during cpu
offline and online handling.

Reported-by: Prakyha Sai Praneeth <sai.praneeth.prakhya@intel.com>
Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Link: http://lkml.kernel.org/r/1502304395-7166-2-git-send-email-vikas.shivappa@linux.intel.com

---
arch/x86/kernel/cpu/intel_rdt.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index da4f389..4b9edb2 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -551,6 +551,7 @@ static void clear_closid_rmid(int cpu)
struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);

per_cpu(rdt_cpu_default.closid, cpu) = 0;
+ per_cpu(rdt_cpu_default.rmid, cpu) = 0;
state->closid = 0;
state->rmid = 0;
wrmsr(IA32_PQR_ASSOC, 0, 0);
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