From: Srinivas Pandruvada Date: Thu, 4 Nov 2021 05:19:25 +0000 (-0700) Subject: cpufreq: intel_pstate: Fix unchecked MSR 0x773 access X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5521055670a53bd495676d1163b40ecb0a37af9c;p=linux.git cpufreq: intel_pstate: Fix unchecked MSR 0x773 access It is possible that on some platforms HWP interrupts are disabled. In that case accessing MSR 0x773 will result in warning. So check X86_FEATURE_HWP_NOTIFY feature to access MSR 0x773. The other places in code where this MSR is accessed, already checks this feature except during disable path called during cpufreq offline and suspend callbacks. Fixes: 57577c996d73 ("cpufreq: intel_pstate: Process HWP Guaranteed change notification") Reported-by: Steven Rostedt Signed-off-by: Srinivas Pandruvada Tested-by: Steven Rostedt (VMware) Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 8896a44ec7b0e..2bb847650b9df 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1627,6 +1627,9 @@ static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata) { unsigned long flags; + if (!boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) + return; + /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */ wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);