Re: [PATCH 1/2] x86/tdx: Add prctl to allow userlevel TDX hypercalls

[Kirill A . Shutemov]

On Mon, Jul 22, 2024 at 10:04:40PM -0700, Tim Merrifield wrote:
> 
> Thanks for the review, Kirill.
> 
> On Mon, Jul 08, 2024 at 03:19:54PM +0300, Kirill A . Shutemov wrote:
> > Hm. Per-thread flag is odd. I think it should be per-process.
> 
> This is the only point I might need some clarification on. I agree
> there doesn't seem to be much value in allowing per-thread control,
> but I don't see any precedence for setting per-process flags through
> arch_prctl or similar interfaces. Am I missing something?

LAM is per-process. But it can only be enabled while the process has only
one thread and locks on second thread spawn. See MM_CONTEXT_LOCK_LAM.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov