Re: [PATCH v8 10/21] x86/virt/seamldr: Shut down the current TDX module

[Chao Gao]

On Thu, Apr 30, 2026 at 11:52:50AM -0700, Dave Hansen wrote:
>On 4/27/26 08:28, Chao Gao wrote:
>>  static int do_seamldr_install_module(void *seamldr_params)
>>  {
>>  	enum module_update_state newstate, curstate = MODULE_UPDATE_START;
>> +	int cpu = smp_processor_id();
>> +	bool primary;
>>  	int ret = 0;
>>  
>> +	primary = cpumask_first(cpu_online_mask) == cpu;
>
>Isn't cpumask_first(cpu_online_mask)==0, always? I thought CPU 0 could
>never be offlined.

Not always. On x86, CPU 0 can be offlined at runtime if the kernel is booted
with the cpu0_hotplug command-line option. See cpu_hotplug.rst.