linux-kernel - Re: [PATCH v7 11/20] x86/virt/tdx: Add placeholder to construct TDMRs to cover all TDX memory regions

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Message-ID: <9a653cd2-70df-8c55-ac7d-5ddcb3b18b0c@intel.com>
Date:   Mon, 28 Nov 2022 07:59:03 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Huang, Kai" <kai.huang@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "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 11/20] x86/virt/tdx: Add placeholder to construct TDMRs
 to cover all TDX memory regions

On 11/24/22 04:02, Huang, Kai wrote:
> On Wed, 2022-11-23 at 14:17 -0800, Dave Hansen wrote:
>> First, I think 'tdx_sysinfo' should probably be a local variable in
>> init_tdx_module() and have its address passed in here.  Having global
>> variables always makes it more opaque about who is initializing it.
> Sorry I missed to respond this.
> 
> Using local variable for 'tdx_sysinfo' will cause a build warning:
> 
> https://lore.kernel.org/lkml/a6694c81b4e96a22557fd0af70a81bd2c2e4e3e7.camel@intel.com/

Having it be local scope is a lot more important than having it be on
stack.  Just declare it local to the function but keep it off the stack.
 No need to dynamically allocate it, even.