linux-kernel - Re: [PATCH] x86/mm: Print the encryption features correctly when a paravisor is present

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: <5245c0df-130c-443d-896b-01887875382b@intel.com>
Date:   Fri, 20 Oct 2023 11:39:32 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "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>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "stefan.bader@...onical.com" <stefan.bader@...onical.com>,
        Tim Gardner <tim.gardner@...onical.com>,
        "roxana.nicolescu@...onical.com" <roxana.nicolescu@...onical.com>,
        "cascardo@...onical.com" <cascardo@...onical.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "matija.glavinic-pecotic.ext@...ia.com" 
        <matija.glavinic-pecotic.ext@...ia.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/mm: Print the encryption features correctly when a
 paravisor is present

On 10/19/23 23:01, Dexuan Cui wrote:
> This patch only modifies x86 related files. I think it's unlikely to see
> a third hardware Coco implementation for x86 in the foreseeable feature (?)

OK, then what good is this patch in the first place?  If you are right,
then this would give equivalent information:

cat /proc/cpuinfo | grep -q Intel && echo 'TDX'
cat /proc/cpuinfo | grep -q AMD   && echo 'SEV'

No kernel patching needed, right?