linux-kernel - Re: [RFC 0/3] Expose Confidential Computing capabilities on sysfs

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Message-ID: <314aea98-7054-09aa-042d-a91796dcbd43@intel.com>
Date:   Tue, 15 Mar 2022 06:30:44 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Isaku Yamahata <isaku.yamahata@...il.com>,
        Alejandro Jimenez <alejandro.j.jimenez@...cle.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        thomas.lendacky@....com, brijesh.singh@....com,
        kirill.shutemov@...ux.intel.com, hpa@...or.com,
        pbonzini@...hat.com, seanjc@...gle.com, srutherford@...gle.com,
        ashish.kalra@....com, darren.kenny@...cle.com,
        venu.busireddy@...cle.com, boris.ostrovsky@...cle.com,
        kvm@...r.kernel.org
Subject: Re: [RFC 0/3] Expose Confidential Computing capabilities on sysfs

On 3/14/22 15:43, Isaku Yamahata wrote:
>                 xfam_fixed0        fixed-0 value for TD xfam value as a
>                                    hexadecimal number with the "0x" prefix.
>                 xfam_fixed1        fixed-1 value for TD xfam value as a
>                                    hexadecimal number with the "0x" prefix.

I don't think we should be exporting things and creating ABI just for
the heck of it.  These are a prime example.  XFAM is reported to the
guest in CPUID.  Yes, these may be used to help *build* XFAM, but
userspace doesn't need to know how XFAM was built.  It just needs to
know what features it can use.