Re: [PATCH 06/25] x86/virt/tdx: Export TDX KeyID information
From: Dave Hansen
Date: Fri Aug 30 2024 - 17:19:00 EST
On 8/30/24 12:16, Edgecombe, Rick P wrote:
...>> In other words, should we export the global KeyID, or export a
function
>> to do the flush and then never actually expose the KeyID?
>
> We could split it into two helpers if we wanted to remove the export of
> tdx_global_keyid. One for global key id and one that only takes TD range key
> ids. Adding more layers is a downside.
I do like the idea of exporting a couple of helpers that are quite hard
to misuse instead of exporting the variable.
> Separate from Dave's question, I wonder if we should open code set_hkid_to_hpa()
> inside tdh_phymem_page_wbinvd(). The signature could change to
> tdh_phymem_page_wbinvd(hpa_t pa, u16 hkid). set_hkid_to_hpa() is very
> lightweight, so I don't think doing it outside the loop is much gain. It makes
> the code cleaner.
Yeah, do what's cleanest. This is all super cold code.