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KVM: TDX: Add load_mmu_pgd method for TDX
For virtual IO, the guest TD shares guest pages with VMM without encryption. Shared EPT is used to map guest pages in unprotected way. Add the VMCS field encoding for the shared EPTP, which will be used by TDX to have separate EPT walks for private GPAs (existing EPTP) versus shared GPAs (new shared EPTP). Set shared EPT pointer value for the TDX guest to initialize TDX MMU. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
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