linux-kernel - Re: [PATCH v3 6/6] KVM: TDX: Explicitly do WBINVD upon reboot notifier

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Message-ID: <3dc49aca717ff9ddb090ef276f2ca30eb14ace95.camel@intel.com>
Date: Wed, 2 Jul 2025 03:14:59 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "Hansen, Dave" <dave.hansen@...el.com>, "bp@...en8.de" <bp@...en8.de>,
	"binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "hpa@...or.com"
	<hpa@...or.com>, "mingo@...hat.com" <mingo@...hat.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "thomas.lendacky@....com" <thomas.lendacky@....com>
CC: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "x86@...nel.org" <x86@...nel.org>, "sagis@...gle.com"
	<sagis@...gle.com>, "Chatre, Reinette" <reinette.chatre@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"Williams, Dan J" <dan.j.williams@...el.com>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, "pbonzini@...hat.com" <pbonzini@...hat.com>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>, "ashish.kalra@....com"
	<ashish.kalra@....com>, "Chen, Farrah" <farrah.chen@...el.com>,
	"nik.borisov@...e.com" <nik.borisov@...e.com>
Subject: Re: [PATCH v3 6/6] KVM: TDX: Explicitly do WBINVD upon reboot
 notifier


> Two nits below.
> 
> Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>
> 
> > 
> > +	/*
> > +	 * Flush cache for all CPUs upon the reboot notifier.  This
> > +	 * avoids having to do WBINVD in stop_this_cpu() during kexec.
> > +	 *
> > +	 * Kexec calls native_stop_other_cpus() to stop remote CPUs
> > +	 * before booting to new kernel, but that code has a "race"
> > +	 * when the normal REBOOT IPI timesout and NMIs are sent to
> 
> timesout should be times out or timeouts?

I will use "times out".

> 
> > +	 * remote CPUs to stop them.  Doing WBINVD in stop_this_cpu()
> > +	 * could potentially increase the posibility of the "race".
> s/posibility/possibility
> 
> 

Oops I didn't check enough :-)

Will fix and thanks.