linux-kernel - [PATCH 5/9] x86/virt/tdx: Move field mapping table of getting TDMR info to function local

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Date: Mon, 17 Jun 2024 00:01:15 +1200
From: Kai Huang <kai.huang@...el.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org,
	dave.hansen@...el.com,
	dan.j.williams@...el.com,
	kirill.shutemov@...ux.intel.com,
	rick.p.edgecombe@...el.com,
	peterz@...radead.org,
	tglx@...utronix.de,
	bp@...en8.de,
	mingo@...hat.com,
	hpa@...or.com,
	seanjc@...gle.com,
	pbonzini@...hat.com,
	kvm@...r.kernel.org,
	isaku.yamahata@...el.com,
	binbin.wu@...ux.intel.com,
	kai.huang@...el.com
Subject: [PATCH 5/9] x86/virt/tdx: Move field mapping table of getting TDMR info to function local

For now the kernel only reads "TD Memory Region" (TDMR) related global
metadata fields to a 'struct tdx_tdmr_sysinfo' for initializing the TDX
module.  The kernel populates the relevant metadata fields into the
structure using a "field mapping table" of metadata field IDs and the
structure members.

Currently the scope of this "field mapping table" is the entire C file.
Future changes will need to read more global metadata fields that will
be organized in other structures and use this kind of field mapping
tables for other structures too.

Move the field mapping table to the function local to limit its scope so
that the same name can also be used by other functions.

Signed-off-by: Kai Huang <kai.huang@...el.com>
---
 arch/x86/virt/vmx/tdx/tdx.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index c68fbaf4aa15..fad42014ca37 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -322,17 +322,17 @@ static int stbuf_read_sysmd_multi(const struct field_mapping *fields,
 #define TD_SYSINFO_MAP_TDMR_INFO(_field_id, _member)	\
 	TD_SYSINFO_MAP(_field_id, struct tdx_tdmr_sysinfo, _member)
 
-/* Map TD_SYSINFO fields into 'struct tdx_tdmr_sysinfo': */
-static const struct field_mapping fields[] = {
-	TD_SYSINFO_MAP_TDMR_INFO(MAX_TDMRS,		max_tdmrs),
-	TD_SYSINFO_MAP_TDMR_INFO(MAX_RESERVED_PER_TDMR, max_reserved_per_tdmr),
-	TD_SYSINFO_MAP_TDMR_INFO(PAMT_4K_ENTRY_SIZE,    pamt_entry_size[TDX_PS_4K]),
-	TD_SYSINFO_MAP_TDMR_INFO(PAMT_2M_ENTRY_SIZE,    pamt_entry_size[TDX_PS_2M]),
-	TD_SYSINFO_MAP_TDMR_INFO(PAMT_1G_ENTRY_SIZE,    pamt_entry_size[TDX_PS_1G]),
-};
-
 static int get_tdx_tdmr_sysinfo(struct tdx_tdmr_sysinfo *tdmr_sysinfo)
 {
+	/* Map TD_SYSINFO fields into 'struct tdx_tdmr_sysinfo': */
+	static const struct field_mapping fields[] = {
+		TD_SYSINFO_MAP_TDMR_INFO(MAX_TDMRS,		max_tdmrs),
+		TD_SYSINFO_MAP_TDMR_INFO(MAX_RESERVED_PER_TDMR, max_reserved_per_tdmr),
+		TD_SYSINFO_MAP_TDMR_INFO(PAMT_4K_ENTRY_SIZE,    pamt_entry_size[TDX_PS_4K]),
+		TD_SYSINFO_MAP_TDMR_INFO(PAMT_2M_ENTRY_SIZE,    pamt_entry_size[TDX_PS_2M]),
+		TD_SYSINFO_MAP_TDMR_INFO(PAMT_1G_ENTRY_SIZE,    pamt_entry_size[TDX_PS_1G]),
+	};
+
 	/* Populate 'tdmr_sysinfo' fields using the mapping structure above: */
 	return stbuf_read_sysmd_multi(fields, ARRAY_SIZE(fields), tdmr_sysinfo);
 }
-- 
2.43.2