linux-kernel - RE: [PATCH 7/9] x86/hyperv: Initialize cpu and memory for SEV-SNP enlightened guest

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Date:   Thu, 8 Jun 2023 14:09:48 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Tianyu Lan <ltykernel@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "arnd@...db.de" <arnd@...db.de>
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>
Subject: RE: [PATCH 7/9] x86/hyperv: Initialize cpu and memory for SEV-SNP
 enlightened guest

From: Tianyu Lan <ltykernel@...il.com> Sent: Thursday, June 1, 2023 8:16 AM
> 

[snip]

> 
> +static __init void hv_snp_get_smp_config(unsigned int early)
> +{
> +	/*
> +	 * The "early" is only to be true when there is AMD
> +	 * numa support. Hyper-V AMD SEV-SNP guest may not
> +	 * have numa support. To make sure smp config is
> +	 * always initialized, do that when early is false.
> +	 */

I didn't really understand this comment.  After doing a little research, let
me suggest this wording:

	/*
	 * The "early" parameter can be true only if old-style AMD
	 * Opteron NUMA detection is enabled, which should never be
	 * the case for an SEV-SNP guest.  See CONFIG_AMD_NUMA.
	 * For safety, just do nothing if "early" is true.
	 */

Let me know if this new wording makes sense based on your understanding.

Michael

> +	if (early)
> +		return;
> +