linux-kernel - Re: [PATCH v3 2/8] x86/virt/tdx: Remove 'struct field_mapping' and implement TD_SYSINFO

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Message-ID: <66db7469dbfdd_22a2294c0@dwillia2-xfh.jf.intel.com.notmuch>
Date: Fri, 6 Sep 2024 14:30:17 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Adrian Hunter <adrian.hunter@...el.com>, Kai Huang <kai.huang@...el.com>,
	<dave.hansen@...el.com>, <kirill.shutemov@...ux.intel.com>,
	<tglx@...utronix.de>, <bp@...en8.de>, <peterz@...radead.org>,
	<mingo@...hat.com>, <hpa@...or.com>, <dan.j.williams@...el.com>,
	<seanjc@...gle.com>, <pbonzini@...hat.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<rick.p.edgecombe@...el.com>, <isaku.yamahata@...el.com>,
	<chao.gao@...el.com>, <binbin.wu@...ux.intel.com>
Subject: Re: [PATCH v3 2/8] x86/virt/tdx: Remove 'struct field_mapping' and
 implement TD_SYSINFO_MAP() macro

Adrian Hunter wrote:
[..]
> Another possibility is to put the macro at the invocation site:
> 
> #define READ_SYS_INFO(_field_id, _member)				\
> 	ret = ret ?: read_sys_metadata_field16(MD_FIELD_ID_##_field_id,	\
> 					       &sysinfo_tdmr->_member)
> 
> 	READ_SYS_INFO(MAX_TDMRS,             max_tdmrs);
> 	READ_SYS_INFO(MAX_RESERVED_PER_TDMR, max_reserved_per_tdmr);
> 	READ_SYS_INFO(PAMT_4K_ENTRY_SIZE,    pamt_entry_size[TDX_PS_4K]);
> 	READ_SYS_INFO(PAMT_2M_ENTRY_SIZE,    pamt_entry_size[TDX_PS_2M]);
> 	READ_SYS_INFO(PAMT_1G_ENTRY_SIZE,    pamt_entry_size[TDX_PS_1G]);
> 
> #undef READ_SYS_INFO
> 
> And so on in later patches:
> 
> #define READ_SYS_INFO(_field_id, _member)				\
> 	ret = ret ?: read_sys_metadata_field(MD_FIELD_ID_##_field_id,	\
> 					     &sysinfo_version->_member)
> 
> 	READ_SYS_INFO(MAJOR_VERSION,    major);
> 	READ_SYS_INFO(MINOR_VERSION,    minor);
> 	READ_SYS_INFO(UPDATE_VERSION,   update);
> 	READ_SYS_INFO(INTERNAL_VERSION, internal);
> 	READ_SYS_INFO(BUILD_NUM,        build_num);
> 	READ_SYS_INFO(BUILD_DATE,       build_date);
> 
> #undef READ_SYS_INFO

Looks like a reasonable enhancement to me.