linux-kernel - Re: [v2 1/1] x86/cpufeatures: Implement Predictive Store Forwarding control.

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Message-ID: <ee949efc-018c-8b70-3224-da4f24b217b6@infradead.org>
Date:   Thu, 22 Apr 2021 10:49:10 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ramakrishna Saripalli <rsaripal@....com>,
        linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        Jonathan Corbet <corbet@....net>
Cc:     bsd@...hat.com
Subject: Re: [v2 1/1] x86/cpufeatures: Implement Predictive Store Forwarding
 control.

On 4/22/21 10:10 AM, Ramakrishna Saripalli wrote:
> From: Ramakrishna Saripalli <rk.saripalli@....com>
> 
> ====================
> Signed-off-by: Ramakrishna Saripalli<rk.saripalli@....com>
> ---
>  .../admin-guide/kernel-parameters.txt         |  5 +++++
>  arch/x86/include/asm/cpufeatures.h            |  1 +
>  arch/x86/include/asm/msr-index.h              |  2 ++
>  arch/x86/kernel/cpu/amd.c                     | 19 +++++++++++++++++++
>  4 files changed, 27 insertions(+)

as from v1:

> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 04545725f187..58f6bd02385b 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -3940,6 +3940,11 @@
>  			Format: {"off"}
>  			Disable Hardware Transactional Memory
>  
> +	predict_store_fwd	[X86] This option controls PSF mitigation

	predict_store_fwd=	...

> +			off - Turns on PSF mitigation.
> +			on  - Turns off PSF mitigation.
> +			default : on.

			default: on.

> +
>  	preempt=	[KNL]
>  			Select preemption mode if you have CONFIG_PREEMPT_DYNAMIC
>  			none - Limited to cond_resched() calls
thanks.
-- 
~Randy