linux-kernel - Re: [PATCH v11 07/20] x86/virt/tdx: Add skeleton to enable TDX on demand

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Message-ID: <8dffbea1-0c9b-498b-c270-409835377e90@intel.com>
Date:   Mon, 5 Jun 2023 16:08:03 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Huang, Kai" <kai.huang@...el.com>,
        "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "david@...hat.com" <david@...hat.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Yamahata, Isaku" <isaku.yamahata@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shahar, Sagi" <sagis@...gle.com>,
        "imammedo@...hat.com" <imammedo@...hat.com>,
        "Gao, Chao" <chao.gao@...el.com>,
        "Brown, Len" <len.brown@...el.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [PATCH v11 07/20] x86/virt/tdx: Add skeleton to enable TDX on
 demand

On 6/5/23 16:04, Huang, Kai wrote:
> I've changed to -ENODEV which doesn't cause build error in my test.
> 
> I agree it's better to include errno.h explicitly but IMHO it's a problem in the
> existing upstream code (tdx_kvm_hypercall() returns -ENODEV when INTEL_TDX_GUEST
> is off), thus should be addressed in a separate patch but not folded into this
> one.
> 
> Since now there's no build error, I hesitated to added such patch.  I can do it
> separately if it should be addressed.

Yes, it should be addressed.