linux-kernel - Re: [patch V3 25/30] x86/microcode: Rendezvous and load in NMI

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Date:   Thu, 28 Sep 2023 11:33:07 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Nikolay Borisov <nik.borisov@...e.com>
Subject: Re: [patch V3 25/30] x86/microcode: Rendezvous and load in NMI

On Wed, Sep 27 2023 at 19:17, Borislav Petkov wrote:
> On Tue, Sep 12, 2023 at 09:58:23AM +0200, Thomas Gleixner wrote:
>>  
>> -	/* No point to wait here. The CPUs will all wait in stop_machine(). */
>> +	touch_nmi_watchdog();
>
> AFAICT, you're touching the NMI watchdog even in the !use_nmi case.

Yes, we need that also for the non-NMI case because this runs in
stop-machine.