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

[Dave Hansen]

On 5/5/26 19:56, Chao Gao wrote:
> 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.

See e59e74dc48a309cb848ffc3d76a0d61aa6803c05.

Yes, the docs are stale.