linux-kernel - Re: [PATCH 2/5] x86/virt/tdx: Move TDMR metadata fields map table to local variable

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Date: Fri, 3 May 2024 12:54:40 +1200
From: "Huang, Kai" <kai.huang@...el.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "Hansen, Dave" <dave.hansen@...el.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org"
	<x86@...nel.org>, "peterz@...radead.org" <peterz@...radead.org>,
	"hpa@...or.com" <hpa@...or.com>, "mingo@...hat.com" <mingo@...hat.com>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>, "jgross@...e.com" <jgross@...e.com>, "Yamahata, Isaku"
	<isaku.yamahata@...el.com>
Subject: Re: [PATCH 2/5] x86/virt/tdx: Move TDMR metadata fields map table to
 local variable



On 3/05/2024 12:29 pm, Edgecombe, Rick P wrote:
> On Fri, 2024-05-03 at 12:18 +1200, Huang, Kai wrote:
>>
>>
>> On 3/05/2024 12:09 pm, Edgecombe, Rick P wrote:
>>> On Sat, 2024-03-02 at 00:20 +1300, Kai Huang wrote:
>>>> The kernel reads all TDMR related global metadata fields based on a
>>>> table which maps the metadata fields to the corresponding members of
>>>> 'struct tdx_tdmr_sysinfo'.
>>>>
>>>> Currently this table is a static variable.  But this table is only used
>>>> by the function which reads these metadata fields and becomes useless
>>>> after reading is done.
>>>>
>>>> Change the table to function local variable.  This also saves the
>>>> storage of the table from the kernel image.
>>>
>>> It seems like a reasonable change, but I don't see how it helps the purpose
>>> of
>>> this series. It seems more like generic cleanup. Can you explain?
>>
>> It doesn't help KVM from exporting API's perspective.
>>
>> I just uses this series for some small improvement (that I believe) of
>> the current code too.
>>
>> I can certainly drop this if you don't want it, but it's just a small
>> change and I don't see the benefit of sending it out separately.
> 
> The change makes sense to me by itself, but it needs to be called out as
> unrelated cleanup. Otherwise it will be confusing to anyone reviewing this from
> the perspective of something KVM TDX needs.
> 
> Don't have a super strong opinion. But given the choice, I would prefer it gets
> separated, because to me it's a lower priority then the rest (which is high).

OK I'll drop this one.