tboot not supported in RHEL installed with UEFI

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Why is tboot not supported on RHEL installed with UEFI?

In order for tboot to work with RHEL installed with UEFI, the grub2-efi (RHEL7) and grub.efi (RHEL6) boot loaders must be able to launch more than one image. In such a scenario, tboot could unknowingly load a blacklisted image whose keys are in the platform vendor's Secure Boot blacklisted keys database...

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