linux-kernel - Re: [PATCH v19 04/25] x86/cpufeatures: Introduce X86_FEATURE

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Message-ID: <ed295475-9799-9bc2-b4a3-681ba5a86824@intel.com>
Date:   Fri, 5 Feb 2021 08:15:02 -0800
From:   "Yu, Yu-cheng" <yu-cheng.yu@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        Pengfei Xu <pengfei.xu@...el.com>
Subject: Re: [PATCH v19 04/25] x86/cpufeatures: Introduce X86_FEATURE_CET and
 setup functions

On 2/5/2021 5:43 AM, Borislav Petkov wrote:
> On Wed, Feb 03, 2021 at 02:55:26PM -0800, Yu-cheng Yu wrote:
>> @@ -1252,6 +1260,13 @@ static void __init cpu_parse_early_param(void)
>>   	if (cmdline_find_option_bool(boot_command_line, "noxsaves"))
>>   		setup_clear_cpu_cap(X86_FEATURE_XSAVES);
>>   
>> +#ifdef CONFIG_X86_CET
>> +	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);
>> +#endif
> 
> Any particular need for the ifdeffery?
> 

Right.  There is no need for that.  I will remove it.

--
Yu-cheng