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

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Message-ID: <9e27993791738d37e9aa650e982a7230500b913e.camel@intel.com>
Date:   Tue, 22 Nov 2022 00:01:19 +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 01/20] x86/tdx: Define TDX supported page sizes as
 macros

On Mon, 2022-11-21 at 15:48 -0800, Hansen, Dave wrote:
> 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.

Thanks.  Will do.