linux-kernel - Re: [PATCH v10 09/38] x86/fred: Disable FRED support if CONFIG_X86

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Date:   Wed, 20 Sep 2023 13:19:56 +0300
From:   Nikolay Borisov <nik.borisov@...e.com>
To:     Xin Li <xin3.li@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-hyperv@...r.kernel.org, kvm@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        luto@...nel.org, pbonzini@...hat.com, seanjc@...gle.com,
        peterz@...radead.org, jgross@...e.com, ravi.v.shankar@...el.com,
        mhiramat@...nel.org, andrew.cooper3@...rix.com,
        jiangshanlai@...il.com
Subject: Re: [PATCH v10 09/38] x86/fred: Disable FRED support if
 CONFIG_X86_FRED is disabled



On 14.09.23 г. 7:47 ч., Xin Li wrote:
> From: "H. Peter Anvin (Intel)" <hpa@...or.com>
> 
> Add CONFIG_X86_FRED to <asm/disabled-features.h> to make
> cpu_feature_enabled() work correctly with FRED.
> 
> Originally-by: Megha Dey <megha.dey@...el.com>
> Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
> Tested-by: Shan Kang <shan.kang@...el.com>
> Signed-off-by: Xin Li <xin3.li@...el.com>
> ---
>   arch/x86/include/asm/disabled-features.h       | 8 +++++++-
>   tools/arch/x86/include/asm/disabled-features.h | 8 +++++++-
>   2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
> index 702d93fdd10e..3cde57cb5093 100644
> --- a/arch/x86/include/asm/disabled-features.h
> +++ b/arch/x86/include/asm/disabled-features.h
> @@ -117,6 +117,12 @@
>   #define DISABLE_IBT	(1 << (X86_FEATURE_IBT & 31))
>   #endif
>   
> +#ifdef CONFIG_X86_FRED
> +# define DISABLE_FRED	0
> +#else
> +# define DISABLE_FRED	(1 << (X86_FEATURE_FRED & 31))
> +#endif
> +
>   /*
>    * Make sure to add features to the correct mask
>    */
> @@ -134,7 +140,7 @@
>   #define DISABLED_MASK11	(DISABLE_RETPOLINE|DISABLE_RETHUNK|DISABLE_UNRET| \
>   			 DISABLE_CALL_DEPTH_TRACKING|DISABLE_USER_SHSTK)
>   #define DISABLED_MASK12	(DISABLE_LAM)
> -#define DISABLED_MASK13	0
> +#define DISABLED_MASK13	(DISABLE_FRED)
>   #define DISABLED_MASK14	0
>   #define DISABLED_MASK15	0
>   #define DISABLED_MASK16	(DISABLE_PKU|DISABLE_OSPKE|DISABLE_LA57|DISABLE_UMIP| \
> diff --git a/tools/arch/x86/include/asm/disabled-features.h b/tools/arch/x86/include/asm/disabled-features.h
> index fafe9be7a6f4..d540ecdd8812 100644
> --- a/tools/arch/x86/include/asm/disabled-features.h
> +++ b/tools/arch/x86/include/asm/disabled-features.h
> @@ -105,6 +105,12 @@
>   # define DISABLE_TDX_GUEST	(1 << (X86_FEATURE_TDX_GUEST & 31))
>   #endif
>   
> +#ifdef CONFIG_X86_FRED
> +# define DISABLE_FRED	0
> +#else
> +# define DISABLE_FRED	(1 << (X86_FEATURE_FRED & 31))
> +#endif
> +
>   /*
>    * Make sure to add features to the correct mask
>    */
> @@ -122,7 +128,7 @@
>   #define DISABLED_MASK11	(DISABLE_RETPOLINE|DISABLE_RETHUNK|DISABLE_UNRET| \
>   			 DISABLE_CALL_DEPTH_TRACKING)
>   #define DISABLED_MASK12	(DISABLE_LAM)
> -#define DISABLED_MASK13	0
> +#define DISABLED_MASK13	(DISABLE_FRED)

FRED feature is defined in cpuid word 12, not 13

>   #define DISABLED_MASK14	0
>   #define DISABLED_MASK15	0
>   #define DISABLED_MASK16	(DISABLE_PKU|DISABLE_OSPKE|DISABLE_LA57|DISABLE_UMIP| \