linux-kernel - Re: [PATCH v1 1/1] x86/fred: Fix system hang during S4 resume with FRED enabled

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Message-ID: <53a6f46c-1b96-45a0-9593-fa8eb8941bbf@zytor.com>
Date: Mon, 31 Mar 2025 23:34:06 -0700
From: Xin Li <xin@...or.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, pavel@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, xi.pardee@...el.com,
        todd.e.brandt@...el.com
Subject: Re: [PATCH v1 1/1] x86/fred: Fix system hang during S4 resume with
 FRED enabled

On 3/31/2025 8:30 AM, Rafael J. Wysocki wrote:
>> +        *
>> +        * Note, FRED RSPs setup needs to access percpu data structures.
> And I'm not sure what you wanted to say here?  Does this refer to the
> ordering of the code below or to something else?

Yes, this refers to the ordering of the code:  FRED config restoration
needs to happen after wrmsrl(MSR_GS_BASE, ctxt->kernelmode_gs_base), or
the system still hangs.

I will make it explicit in the next iteration.