Re: [PATCH v2 03/17] x86/virt/tdx: Detect if the extensions initialization is required

[Chao Gao <chao.gao@intel.com>]

>+static __init int init_tdx_module_extensions(void)
>+{
>+	struct tdx_sys_info_ext sysinfo_ext;
>+	int ret;
>+
>+	if (!(tdx_sysinfo.features.tdx_features0 & TDX_FEATURES0_EXT))
>+		return 0;
>+
>+	ret = get_tdx_sys_info_ext(&sysinfo_ext);
>+	if (ret)
>+		return ret;
>+
>+	/* Skip if no feature requires TDX module extensions. */
>+	if (!sysinfo_ext.ext_required)
>+		return 0;

What would happen if the kernel doesn't do this 'ext_required' check
and always does the extension initialization?

If TDH.EXT.INIT returns success when no extension is configured, we
could drop this 'ext_required' from this series entirely.

>+
>+	/* TODO: add the extensions enabling steps here */
>+
>+	return 0;
>+}