x86/msr: Do not allow writes to MSR_IA32_ENERGY_PERF_BIAS

Now that all in-kernel-tree users are converted to using the sysfs file,
remove the MSR from the "allowlist".

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lkml.kernel.org/r/20201029190259.3476-5-bp@alien8.de

diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index c0d4098..b114786 100644 (file)
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -99,9 +99,6 @@ static int filter_write(u32 reg)
        if (!__ratelimit(&fw_rs))
                return 0;
 
-       if (reg == MSR_IA32_ENERGY_PERF_BIAS)
-               return 0;
-
        pr_err("Write to unrecognized MSR 0x%x by %s (pid: %d). Please report to x86@kernel.org.\n",
               reg, current->comm, current->pid);