Re: [RFC PATCH v5 092/104] KVM: TDX: Handle TDX PV HLT hypercall

[Sean Christopherson]

On Fri, Mar 04, 2022, isaku.yamahata@xxxxxxxxx wrote:
> From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> 
> Wire up TDX PV HLT hypercall to the KVM backend function.
> 
> When the guest issues HLT, the hypercall instruction can be the right after
> CLI instruction.  Atomically unmask virtual interrupt and issue HLT
> hypercall. The virtual interrupts can arrive right after CLI instruction
> before switching back to VMM.  In such a case, the VMM should return to the
> guest without losing the interrupt.  Check if interrupts arrived before the
> TDX module switching to VMM.  And return to the guest in such cases.

Pretty sure you mean STI, not CLI.