Messages in this thread Patch in this message | | | From | Jan Kiszka <> | Subject | [PATCH] intel_pstate: Fix MSR_CONFIG_TDP_x addressing in core_get_max_pstate | Date | Fri, 8 Jul 2016 20:42:04 +0200 |
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If MSR_CONFIG_TDP_CONTROL is locked, we currently try to address some MSR 0x80000648 or so. Mask out the relevant level bits 0 and 1.
Found while running over the Jailhouse hypervisor which became upset about this strange MSR index.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 1fa1a32..1b15917 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -944,7 +944,7 @@ static int core_get_max_pstate(void) if (err) goto skip_tar; - tdp_msr = MSR_CONFIG_TDP_NOMINAL + tdp_ctrl; + tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x3); err = rdmsrl_safe(tdp_msr, &tdp_ratio); if (err) goto skip_tar; -- 2.1.4
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