Re: [patch V3 02/40] x86/apic: Fake primary thread mask for XEN/PV

[Thomas Gleixner]

On Fri, Aug 04 2023 at 20:12, Borislav Petkov wrote:
>> @@ -2344,6 +2346,15 @@ static int __init smp_init_primary_threa
>>  {
>>  	unsigned int cpu;
>>  
>> +	/*
>> +	 * XEN/PV provides either none or useless topology information.
>> +	 * Pretend that all vCPUs are primary threads.
>> +	 */
>> +	if (xen_pv_domain()) {
>> +		cpumask_copy(&__cpu_primary_thread_mask, cpu_possible_mask);
>> +		return 0;
>> +	}
>
> Can this be somewhere in the Xen init code instead?

Not for now. That's all going away with the 3rd installment. But right
now it's the right place to be.