Implement the callback for TDX guest to check whether the maximum vCPUs passed from usrspace can be supported by TDX, and if it can, override Accordingly, in the KVM_CHECK_EXTENSION IOCTL(), change to return the 'struct kvm::max_vcpus' for a given VM for the KVM_CAP_MAX_VCPUS.
Sorry some error during copy/paste. The above should be: Implement the callback for TDX guest to check whether the maximum vCPUs passed from usrspace can be supported by TDX, and if it can, override the 'struct kvm::max_vcpus'. Leave VMX guests and all AMD guests unsupported to avoid any side-effect for those VMs. Accordingly, in the KVM_CHECK_EXTENSION IOCTL(), change to return the 'struct kvm::max_vcpus' for a given VM for the KVM_CAP_MAX_VCPUS.
