linux-kernel - Re: [PATCH v7 15/20] x86/virt/tdx: Reserve TDX module global KeyID

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Date:   Thu, 24 Nov 2022 22:39:30 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Luck, Tony" <tony.luck@...el.com>,
        "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "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 v7 15/20] x86/virt/tdx: Reserve TDX module global KeyID

On Wed, 2022-11-23 at 15:40 -0800, Dave Hansen wrote:
> On 11/20/22 16:26, Kai Huang wrote:
> > @@ -1053,6 +1056,12 @@ static int init_tdx_module(void)
> >  	if (ret)
> >  		goto out_free_tdmrs;
> >  
> > +	/*
> > +	 * Reserve the first TDX KeyID as global KeyID to protect
> > +	 * TDX module metadata.
> > +	 */
> > +	tdx_global_keyid = tdx_keyid_start;
> 
> This doesn't "reserve" squat.
> 
> You could argue that it "picks", "chooses", or "designates" the
> 'tdx_global_keyid', but where is the "reservation"?

Right.  I'll change to use "choose".