linux-kernel - Re: [PATCH] x86/resctrl: Fix to restore to original value when re-enabling hardware prefetch register

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Date:   Tue, 24 May 2022 11:38:10 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Kohei Tarumizu <tarumizu.kohei@...itsu.com>,
        <fenghua.yu@...el.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        <hpa@...or.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/resctrl: Fix to restore to original value when
 re-enabling hardware prefetch register



On 5/17/2022 9:55 PM, Kohei Tarumizu wrote:
> The current pseudo_lock.c code overwrites the value of the
> MSR_MISC_FEATURE_CONTROL to 0 even if the original value is not 0.
> Therefore, modify it to save and restore the original values.
> 
> Fixes: 018961ae5579 ("x86/intel_rdt: Pseudo-lock region creation/removal core")
> Fixes: 443810fe6160 ("x86/intel_rdt: Create debugfs files for pseudo-locking testing")
> Fixes: 8a2fc0e1bc0c ("x86/intel_rdt: More precise L2 hit/miss measurements")
> Signed-off-by: Kohei Tarumizu <tarumizu.kohei@...itsu.com>
> ---

Thank you very much for catching this.

Acked-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette