linux-kernel - Re: [PATCH v2 1/1] x86/fred: Fix the FRED RSP0 MSR out of sync with its per-CPU cache

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Message-ID: <296bc51f-0668-4ef8-869b-8089ea6e9766@intel.com>
Date: Fri, 10 Jan 2025 10:09:35 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: "Xin Li (Intel)" <xin@...or.com>, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 andrew.cooper3@...rix.com
Subject: Re: [PATCH v2 1/1] x86/fred: Fix the FRED RSP0 MSR out of sync with
 its per-CPU cache

On 1/10/25 09:46, Xin Li (Intel) wrote:
...> Fix the bug through resynchronizing the FRED RSP0 MSR with its
> per-CPU cache in cpu_init_fred_exceptions().
> 
> Fixes: fe85ee391966 ("x86/entry: Set FRED RSP0 on return to userspace instead of context switch")
> Signed-off-by: Xin Li (Intel) <xin@...or.com>
> Cc: stable@...r.kernel.org

Thanks for the update:

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>

I'll probably do a wee bit of testing today and apply to the urgent pile
early next week.