This is a note to let you know that I've just added the patch titled intel_pstate: Fix MSR_CONFIG_TDP_x addressing in core_get_max_pstate() to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: intel_pstate-fix-msr_config_tdp_x-addressing-in-core_get_max_pstate.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 5fc8f707a2aa40c767c3a338738b9b6fcd151ac1 Mon Sep 17 00:00:00 2001 From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> Date: Fri, 8 Jul 2016 20:42:04 +0200 Subject: intel_pstate: Fix MSR_CONFIG_TDP_x addressing in core_get_max_pstate() From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> commit 5fc8f707a2aa40c767c3a338738b9b6fcd151ac1 upstream. 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@xxxxxxxxxxx> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -662,7 +662,7 @@ 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; Patches currently in stable-queue which might be from jan.kiszka@xxxxxxxxxxx are queue-4.4/intel_pstate-fix-msr_config_tdp_x-addressing-in-core_get_max_pstate.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html