Re: [PATCH v11 018/113] KVM: TDX: create/destroy VM structure

[Huang, Kai]

On Thu, 2023-01-19 at 21:36 +0000, Sean Christopherson wrote:
> The least invasive idea I have is expand the TDP MMU's concept of "frozen" SPTEs
> and freeze (a.k.a. lock) the SPTE (KVM's mirror) until the corresponding S-EPT
> update completes.

This will introduce another "having-to-wait while SPTE is frozen" problem I
think, which IIUC means (one way is) you have to do some loop and retry, perhaps
similar to yield_safe.

> 
> The other idea is to scrap the mirror concept entirely, though I gotta imagine
> that would provide pretty awful performance.

Right.  I don't think this is a good option.