| Message ID | 20230628022554.1638318-4-longman@redhat.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | x86/speculation: Disable IBRS when idle | expand |
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 34201d7ef33e..e32ff09051af 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -182,12 +182,12 @@ static __cpuidle int intel_idle_ibrs(struct cpuidle_device *dev, int ret; if (smt_active) - native_wrmsrl(MSR_IA32_SPEC_CTRL, 0); + __update_spec_ctrl(0); ret = __intel_idle(dev, drv, index); if (smt_active) - native_wrmsrl(MSR_IA32_SPEC_CTRL, spec_ctrl); + __update_spec_ctrl(spec_ctrl); return ret; }
When intel_idle_ibrs() is called, it modifies the SPEC_CTRL MSR to 0 in order disable IBRS. However, the new MSR value isn't reflected in x86_spec_ctrl_current which is at odd with the other code that keep track of its state in that percpu variable. Use the new __update_spec_ctrl() to have the x86_spec_ctrl_current percpu value properly updated. Signed-off-by: Waiman Long <longman@redhat.com> --- drivers/idle/intel_idle.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)