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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <BYAPR21MB16882DC67EAF87B518D5D72ED750A@BYAPR21MB1688.namprd21.prod.outlook.com>
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;
> +