Macro if_tdx_enabled

macro_rules! if_tdx_enabled {
    ($if_block:block else $else_block:block) => { ... };
    ($if_block:block) => { ... };
}

Inserts a TDX-specific code block.

This macro conditionally executes a TDX-specific code block based on the following conditions: (1) The cvm_guest feature is enabled at compile time. (2) The TDX feature is detected at runtime via ::tdx_guest::tdx_is_enabled().

If both conditions are met, the if_block is executed. If an else_block is provided, it will be executed when either the cvm_guest feature is not enabled or the TDX feature is not detected at runtime.