linux-kernel - Re: [PATCH v5 04/12] x86/tdx: Add protected guest support for TDX 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: <8129ef50-467f-fe2e-c770-a32c690c5177@linux.intel.com>
Date:   Fri, 20 Aug 2021 10:11:21 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Peter H Anvin <hpa@...or.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 04/12] x86/tdx: Add protected guest support for TDX
 guest



On 8/20/21 9:59 AM, Borislav Petkov wrote:
> Err, why?
> 
> TDX is Intel technology. That's like asking to have
> 
> sev_prot_guest_has() and amd_prot_guest_has() on AMD.
> 
> Maybe I still don't get what you're trying to achieve but from where I'm
> standing that sounds wrong.

My intention was to keep intel_* function clean and hide all TDX specific
customization in tdx_* function (within in tdx.c) and call it from
intel_* function (within cpu/intel.c).

But I understand your point as well. I am fine with moving TDX specific checks to
intel_* function.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer