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

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Message-ID: <9c36d878-db83-5c0e-90f3-8f19dd25801c@intel.com>
Date:   Wed, 23 Nov 2022 15:40:37 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kai Huang <kai.huang@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     linux-mm@...ck.org, seanjc@...gle.com, pbonzini@...hat.com,
        dan.j.williams@...el.com, rafael.j.wysocki@...el.com,
        kirill.shutemov@...ux.intel.com, ying.huang@...el.com,
        reinette.chatre@...el.com, len.brown@...el.com,
        tony.luck@...el.com, peterz@...radead.org, ak@...ux.intel.com,
        isaku.yamahata@...el.com, chao.gao@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, bagasdotme@...il.com,
        sagis@...gle.com, imammedo@...hat.com
Subject: Re: [PATCH v7 15/20] x86/virt/tdx: Reserve TDX module global KeyID

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"?