linux-kernel - Re: [RFC PATCH 1/5] x86/kexec: Do unconditional WBINVD for bare-metal in stop_this

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Message-ID: <a11ec309acdebd6149d7daf2be6de76a92308a0a.camel@intel.com>
Date: Wed, 19 Mar 2025 17:03:43 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"Hansen, Dave" <dave.hansen@...el.com>
CC: "Huang, Kai" <kai.huang@...el.com>, "ashish.kalra@....com"
	<ashish.kalra@....com>, "dyoung@...hat.com" <dyoung@...hat.com>,
	"thomas.lendacky@....com" <thomas.lendacky@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Chatre,
 Reinette" <reinette.chatre@...el.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>,
	"mingo@...hat.com" <mingo@...hat.com>, "Yamahata, Isaku"
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	"x86@...nel.org" <x86@...nel.org>, "Williams, Dan J"
	<dan.j.williams@...el.com>
Subject: Re: [RFC PATCH 1/5] x86/kexec: Do unconditional WBINVD for bare-metal
 in stop_this_cpu()

On Wed, 2025-03-19 at 09:41 -0700, Dave Hansen wrote:
> They _theoretically_ need a WBINVD at kexec. But there
> might be enough other things happening during kexec (including other
> WBINVD's) to keep us from getting bitten in practice.

Thanks Dave. It seems there have been a number of issues in this step, so just
trying to make sure I understand how it is supposed to work before we change it.