linux-kernel - [PATCH v9 5/6] x86/virt/tdx: Switch to use auto-generated global metadata reading code

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Message-ID: <fc025d1e13b92900323f47cfe9aac3157bf08ee7.1734188033.git.kai.huang@intel.com>
Date: Sun, 15 Dec 2024 04:15:46 +1300
From: Kai Huang <kai.huang@...el.com>
To: 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,
	rick.p.edgecombe@...el.com,
	isaku.yamahata@...el.com,
	adrian.hunter@...el.com,
	nik.borisov@...e.com,
	kai.huang@...el.com
Subject: [PATCH v9 5/6] x86/virt/tdx: Switch to use auto-generated global metadata reading code

Continue the process to have a centralized solution for TDX global
metadata reading.  Now that the new autogenerated solution is ready for
use, switch to it and remove the old one.

Signed-off-by: Kai Huang <kai.huang@...el.com>
Reviewed-by: Nikolay Borisov <nik.borisov@...e.com>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
---
v8 -> v9:
 - Improve changelog suggested by Rick.

---
 arch/x86/virt/vmx/tdx/tdx.c | 61 +------------------------------------
 arch/x86/virt/vmx/tdx/tdx.h | 45 +--------------------------
 2 files changed, 2 insertions(+), 104 deletions(-)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 28537a6c47fc..43ec56db5084 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -270,66 +270,7 @@ static int read_sys_metadata_field(u64 field_id, u64 *data)
 	return 0;
 }
 
-static int read_sys_metadata_field16(u64 field_id,
-				     int offset,
-				     struct tdx_sys_info_tdmr *ts)
-{
-	u16 *ts_member = ((void *)ts) + offset;
-	u64 tmp;
-	int ret;
-
-	if (WARN_ON_ONCE(MD_FIELD_ID_ELE_SIZE_CODE(field_id) !=
-			MD_FIELD_ID_ELE_SIZE_16BIT))
-		return -EINVAL;
-
-	ret = read_sys_metadata_field(field_id, &tmp);
-	if (ret)
-		return ret;
-
-	*ts_member = tmp;
-
-	return 0;
-}
-
-struct field_mapping {
-	u64 field_id;
-	int offset;
-};
-
-#define TD_SYSINFO_MAP(_field_id, _offset) \
-	{ .field_id = MD_FIELD_ID_##_field_id,	   \
-	  .offset   = offsetof(struct tdx_sys_info_tdmr, _offset) }
-
-/* Map TD_SYSINFO fields into 'struct tdx_sys_info_tdmr': */
-static const struct field_mapping fields[] = {
-	TD_SYSINFO_MAP(MAX_TDMRS,	      max_tdmrs),
-	TD_SYSINFO_MAP(MAX_RESERVED_PER_TDMR, max_reserved_per_tdmr),
-	TD_SYSINFO_MAP(PAMT_4K_ENTRY_SIZE,    pamt_4k_entry_size),
-	TD_SYSINFO_MAP(PAMT_2M_ENTRY_SIZE,    pamt_2m_entry_size),
-	TD_SYSINFO_MAP(PAMT_1G_ENTRY_SIZE,    pamt_1g_entry_size),
-};
-
-static int get_tdx_sys_info_tdmr(struct tdx_sys_info_tdmr *sysinfo_tdmr)
-{
-	int ret;
-	int i;
-
-	/* Populate 'sysinfo_tdmr' fields using the mapping structure above: */
-	for (i = 0; i < ARRAY_SIZE(fields); i++) {
-		ret = read_sys_metadata_field16(fields[i].field_id,
-						fields[i].offset,
-						sysinfo_tdmr);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static int get_tdx_sys_info(struct tdx_sys_info *sysinfo)
-{
-	return get_tdx_sys_info_tdmr(&sysinfo->tdmr);
-}
+#include "tdx_global_metadata.c"
 
 /* Calculate the actual TDMR size */
 static int tdmr_size_single(u16 max_reserved_per_tdmr)
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index ec879d54eb5c..641beec86e73 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -2,7 +2,7 @@
 #ifndef _X86_VIRT_TDX_H
 #define _X86_VIRT_TDX_H
 
-#include <linux/bits.h>
+#include "tdx_global_metadata.h"
 
 /*
  * This file contains both macros and data structures defined by the TDX
@@ -26,35 +26,6 @@
 #define	PT_NDA		0x0
 #define	PT_RSVD		0x1
 
-/*
- * Global scope metadata field ID.
- *
- * See Table "Global Scope Metadata", TDX module 1.5 ABI spec.
- */
-#define MD_FIELD_ID_MAX_TDMRS			0x9100000100000008ULL
-#define MD_FIELD_ID_MAX_RESERVED_PER_TDMR	0x9100000100000009ULL
-#define MD_FIELD_ID_PAMT_4K_ENTRY_SIZE		0x9100000100000010ULL
-#define MD_FIELD_ID_PAMT_2M_ENTRY_SIZE		0x9100000100000011ULL
-#define MD_FIELD_ID_PAMT_1G_ENTRY_SIZE		0x9100000100000012ULL
-
-/*
- * Sub-field definition of metadata field ID.
- *
- * See Table "MD_FIELD_ID (Metadata Field Identifier / Sequence Header)
- * Definition", TDX module 1.5 ABI spec.
- *
- *  - Bit 33:32: ELEMENT_SIZE_CODE -- size of a single element of metadata
- *
- *	0: 8 bits
- *	1: 16 bits
- *	2: 32 bits
- *	3: 64 bits
- */
-#define MD_FIELD_ID_ELE_SIZE_CODE(_field_id)	\
-		(((_field_id) & GENMASK_ULL(33, 32)) >> 32)
-
-#define MD_FIELD_ID_ELE_SIZE_16BIT	1
-
 struct tdmr_reserved_area {
 	u64 offset;
 	u64 size;
@@ -80,20 +51,6 @@ struct tdmr_info {
 	DECLARE_FLEX_ARRAY(struct tdmr_reserved_area, reserved_areas);
 } __packed __aligned(TDMR_INFO_ALIGNMENT);
 
-/* Class "TDMR info" */
-struct tdx_sys_info_tdmr {
-	u16 max_tdmrs;
-	u16 max_reserved_per_tdmr;
-	u16 pamt_4k_entry_size;
-	u16 pamt_2m_entry_size;
-	u16 pamt_1g_entry_size;
-};
-
-/* Kernel used global metadata fields */
-struct tdx_sys_info {
-	struct tdx_sys_info_tdmr tdmr;
-};
-
 /*
  * Do not put any hardware-defined TDX structure representations below
  * this comment!
-- 
2.47.1