linux-kernel - Re: [PATCH V2] x86/apic: Stop the TSC Deadline timer during lapic timer shutdown

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Message-ID: <a6adc8fb982fdf914847990483ae2a263d7d4397.camel@intel.com>
Date: Fri, 11 Oct 2024 14:51:06 +0000
From: "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To: "rafael@...nel.org" <rafael@...nel.org>, "Hansen, Dave"
	<dave.hansen@...el.com>
CC: "Luck, Tony" <tony.luck@...el.com>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "stable@...r.kernel.org"
	<stable@...r.kernel.org>, "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>, "Zhang, Rui" <rui.zhang@...el.com>,
	"thorsten.blum@...lux.com" <thorsten.blum@...lux.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "yuntao.wang@...ux.dev" <yuntao.wang@...ux.dev>,
	"hpa@...or.com" <hpa@...or.com>, "peterz@...radead.org"
	<peterz@...radead.org>, "bp@...en8.de" <bp@...en8.de>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "Brown, Len"
	<len.brown@...el.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH V2] x86/apic: Stop the TSC Deadline timer during lapic
 timer shutdown

On Fri, 2024-10-11 at 12:25 +0200, Rafael J. Wysocki wrote:
> On Fri, Oct 11, 2024 at 2:43 AM Dave Hansen <dave.hansen@...el.com>
> wrote:
> > 
> > How about something like the completely untested attached patch?
> > 
> > IMNHO, it improves on what was posted here because it draws a
> > parallel
> > with an AMD erratum and also avoids writes to APIC_TMICT that would
> > get
> > ignored anyway.
> 
> Please feel free to add
> 
> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> to this one when it's ready.
Tested on Lunar Lake for the new patch

Tested-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>