Re: [PATCH v5 13/19] x86/cpufeatures: Add flag to track whether MSR IA32_FEAT_CTL is configured

Jacob Keller
2020-02-25T22:52:38Z

On 2/25/2020 2:12 PM, Sean Christopherson wrote:
> On Tue, Feb 25, 2020 at 01:49:13PM -0800, Jacob Keller wrote:
>> Hi Sean,
>>
>> I suspect something is wrong and the features are enabled even though
>> the BIOS has it disabled, leading to later failure because of this.
>
> Hrm. On the failing kernel, what are the values of MSR 0x3a for all CPUs,
> i.e. what's the output of 'sudo rdmsr -a 0x3a'?
>

On the old (fedora 30) kernel, every cpu reports as '1'.

I can't easily test the failing kernel because it crashes during boot.

Thanks,
Jake