linux-kernel - Re: [PATCH v7 01/20] x86/tdx: Define TDX supported page sizes as macros

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Date:   Mon, 21 Nov 2022 15:48:09 -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 01/20] x86/tdx: Define TDX supported page sizes as
 macros

On 11/20/22 16:26, Kai Huang wrote:
> +/*
> + * TDX supported page sizes (4K/2M/1G).
> + *
> + * Those values are part of the TDX module ABI.  Do not change them.
> + */
> +#define TDX_PS_4K	0
> +#define TDX_PS_2M	1
> +#define TDX_PS_1G	2

That comment can just be:

/* TDX supported page sizes from the TDX module ABI. */

I think folks understand that the kernel can't willy nilly change ABI
values.