# Re: \[PATCH v28 04/32\] x86/cpufeatures: Introduce CPU setup and option parsing for CET

- From: Borislav Petkov \<bp@alien8.de\>
- Date: 2021-08-09 16:05:57 
- List: linux-mm
- Page: https://ratatoskr.run/linux-mm/2021/08/1472105
- Thread: https://ratatoskr.run/linux-doc/2021/07/1455208/t.md

```text
On Thu, Jul 22, 2021 at 01:51:51PM -0700, Yu-cheng Yu wrote:
>  /*
>   * Some CPU features depend on higher CPUID levels, which may not always
>   * be available due to CPUID level capping or broken virtualization
> @@ -1249,6 +1257,11 @@ static void __init cpu_parse_early_param(void)
>  	if (cmdline_find_option_bool(boot_command_line, "noxsaves"))
>  		setup_clear_cpu_cap(X86_FEATURE_XSAVES);
>  
> +	if (cmdline_find_option_bool(boot_command_line, "no_user_shstk"))
> +		setup_clear_cpu_cap(X86_FEATURE_SHSTK);
> +	if (cmdline_find_option_bool(boot_command_line, "no_user_ibt"))
> +		setup_clear_cpu_cap(X86_FEATURE_IBT);

Patch 1 says:

"Disabling shadow stack also disables IBT."

I don't see that here.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

```