linux-kernel - Re: [PATCH] x86/mm: Check cc_vendor when printing memory encryption info

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Message-ID: <16ea75a9-8c94-4665-ae04-32d08aa4ebb2@intel.com>
Date:   Thu, 9 Nov 2023 08:25:04 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org,
        Michael Kelley <mhklinux@...look.com>,
        Dexuan Cui <decui@...rosoft.com>
Cc:     linux-hyperv@...r.kernel.org, stefan.bader@...onical.com,
        tim.gardner@...onical.com, roxana.nicolescu@...onical.com,
        cascardo@...onical.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        wei.liu@...nel.org, kirill.shutemov@...ux.intel.com,
        sashal@...nel.org
Subject: Re: [PATCH] x86/mm: Check cc_vendor when printing memory encryption
 info

On 11/9/23 08:14, Jeremi Piotrowski wrote:
...
>  	pr_info("Memory Encryption Features active:");
>  
> -	if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) {
> +	if (cc_vendor == CC_VENDOR_INTEL) {
>  		pr_cont(" Intel TDX\n");
>  		return;
>  	}

Why aren't these guests setting X86_FEATURE_TDX_GUEST?