linux-kernel - Re: [PATCH v10 02/11] x86/tdx: Introduce INTEL_TDX

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Message-ID: <2c03ae77-640e-fc25-a65b-2416f090281d@linux.intel.com>
Date:   Mon, 11 Oct 2021 11:38:55 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 02/11] x86/tdx: Introduce INTEL_TDX_GUEST config
 option


On 10/11/2021 11:19 AM, Josh Poimboeuf wrote:
> On Fri, Oct 08, 2021 at 10:37:38PM -0700, Kuppuswamy Sathyanarayanan wrote:
>> +config INTEL_TDX_GUEST
>> +	bool "Intel Trusted Domain Extensions (TDX) Guest Support"
>> +	depends on X86_64 && CPU_SUP_INTEL && PARAVIRT
>> +	depends on SECURITY
>> +	depends on X86_X2APIC
>> +	help
>> +	  Provide support for running in a trusted domain on Intel processors
>> +	  equipped with Trusted Domain Extensions. TDX is a Intel technology
>> +	  that extends VMX and Memory Encryption with a new kind of virtual
>> +	  machine guest called Trust Domain (TD). A TD is designed to run in
>> +	  a CPU mode that protects the confidentiality of TD memory contents
>> +	  and the TD’s CPU state from other software, including VMM. TDX guest
>> +	  uses virtual X2APIC for interrupt management.
> Why does it depend on SECURITY?  It should at least be explained in the
> commit message.

It can be dropped, it was only needed in an earlier version that used a LSM.

-Andi

>