Re: [PATCH 01/15] x86/virt/tdx: Read global metadata for TDX Module Extensions

[Sohil Mehta]

On 5/27/2026 12:11 AM, Xu Yilun wrote:

>>> +struct tdx_sys_info_ext {
>>> +	u16 memory_pool_required_pages;
>>> +	u8 ext_required;
>>
>> The name ext_required seems like a boolean. It is also used like a
>> boolean later.
>> 	if (!tdx_sysinfo.ext.ext_required)
>> 		return 0;
>>
>> But, IIUC, is it actually a mask that lists any feature that needs
> 
> No it is just a bool about Extentions needs to be initialized or not.
> 
How does the kernel know which features need Extensions? Is there any
hardware enumeration or the kernel just keeps a static list?