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    SubjectRe: [PATCH v19 104/130] KVM: TDX: Add a place holder for handler of TDX hypercalls (TDG.VP.VMCALL)
    > static inline bool is_td_vcpu_created(struct vcpu_tdx *tdx)
    > {
    > return tdx->td_vcpu_created;
    >@@ -897,6 +932,11 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu)
    >
    > tdx_complete_interrupts(vcpu);
    >
    >+ if (tdx->exit_reason.basic == EXIT_REASON_TDCALL)
    >+ tdx->tdvmcall.rcx = vcpu->arch.regs[VCPU_REGS_RCX];

    kvm_rcx_read()?


    >+ else
    >+ tdx->tdvmcall.rcx = 0;

    RCX on TDVMCALL exit is supposed to be consumed by TDX module. I don't get why
    caching it is necessary. Can tdx->tdvmcall be simply dropped?

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