@@ -24987,6 +24987,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/core
F: Documentation/arch/x86/
F: Documentation/devicetree/bindings/x86/
F: arch/x86/
+F: scripts/tdx_global_metadata.py
F: tools/testing/selftests/x86
X86 CPUID DATABASE
new file mode 100644
@@ -0,0 +1,187 @@
+#! /usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+import json
+import sys
+
+# Note: this script does not run as part of the build process.
+# It is used to generate structs from the TDX global_metadata.json
+# file, and functions to fill in said structs. Rerun it if
+# you need more fields.
+
+TDX_STRUCTS = {
+ "version": [
+ "BUILD_DATE",
+ "BUILD_NUM",
+ "MINOR_VERSION",
+ "MAJOR_VERSION",
+ "UPDATE_VERSION",
+ "INTERNAL_VERSION",
+ ],
+ "features": [
+ "TDX_FEATURES0"
+ ],
+ "tdmr": [
+ "MAX_TDMRS",
+ "MAX_RESERVED_PER_TDMR",
+ "PAMT_4K_ENTRY_SIZE",
+ "PAMT_2M_ENTRY_SIZE",
+ "PAMT_1G_ENTRY_SIZE",
+ ],
+ "cmr": [
+ "NUM_CMRS", "CMR_BASE", "CMR_SIZE"
+ ],
+}
+
+STRUCT_PREFIX = "tdx_sys_info"
+FUNC_PREFIX = "get_tdx_sys_info"
+STRVAR_PREFIX = "sysinfo"
+
+def print_class_struct_field(field_name, element_bytes, num_fields, num_elements, file):
+ element_type = "u%s" % (element_bytes * 8)
+ element_array = ""
+ if num_fields > 1:
+ element_array += "[%d]" % (num_fields)
+ if num_elements > 1:
+ element_array += "[%d]" % (num_elements)
+ print("\t%s %s%s;" % (element_type, field_name, element_array), file=file)
+
+def print_class_struct(class_name, fields, file):
+ struct_name = "%s_%s" % (STRUCT_PREFIX, class_name)
+ print("struct %s {" % (struct_name), file=file)
+ for f in fields:
+ print_class_struct_field(
+ f["Field Name"].lower(),
+ int(f["Element Size (Bytes)"]),
+ int(f["Num Fields"]),
+ int(f["Num Elements"]),
+ file=file)
+ print("};", file=file)
+
+def print_read_field(field_id, struct_var, struct_member, indent, file):
+ print(
+ "%sif (!ret && !(ret = read_sys_metadata_field(%s, &val)))\n%s\t%s->%s = val;"
+ % (indent, field_id, indent, struct_var, struct_member),
+ file=file,
+ )
+
+def print_class_function(class_name, fields, file):
+ func_name = "%s_%s" % (FUNC_PREFIX, class_name)
+ struct_name = "%s_%s" % (STRUCT_PREFIX, class_name)
+ struct_var = "%s_%s" % (STRVAR_PREFIX, class_name)
+
+ print("static int %s(struct %s *%s)" % (func_name, struct_name, struct_var), file=file)
+ print("{", file=file)
+ print("\tint ret = 0;", file=file)
+ print("\tu64 val;", file=file)
+
+ has_i = 0
+ has_j = 0
+ for f in fields:
+ num_fields = int(f["Num Fields"])
+ num_elements = int(f["Num Elements"])
+ if num_fields > 1:
+ has_i = 1
+ if num_elements > 1:
+ has_j = 1
+
+ if has_i == 1 and has_j == 1:
+ print("\tint i, j;", file=file)
+ elif has_i == 1:
+ print("\tint i;", file=file)
+
+ print(file=file)
+ for f in fields:
+ fname = f["Field Name"]
+ field_id = f["Base FIELD_ID (Hex)"]
+ num_fields = int(f["Num Fields"])
+ num_elements = int(f["Num Elements"])
+ struct_member = fname.lower()
+ indent = "\t"
+ if num_fields > 1:
+ if fname == "CMR_BASE" or fname == "CMR_SIZE":
+ limit = "%s_%s->num_cmrs" %(STRVAR_PREFIX, "cmr")
+ elif fname == "CPUID_CONFIG_LEAVES" or fname == "CPUID_CONFIG_VALUES":
+ limit = "%s_%s->num_cpuid_config" %(STRVAR_PREFIX, "td_conf")
+ else:
+ limit = "%d" %(num_fields)
+ print("%sfor (i = 0; i < %s; i++)" % (indent, limit), file=file)
+ indent += "\t"
+ field_id += " + i"
+ struct_member += "[i]"
+ if num_elements > 1:
+ print("%sfor (j = 0; j < %d; j++)" % (indent, num_elements), file=file)
+ indent += "\t"
+ field_id += " * 2 + j"
+ struct_member += "[j]"
+
+ print_read_field(
+ field_id,
+ struct_var,
+ struct_member,
+ indent,
+ file=file,
+ )
+
+ print(file=file)
+ print("\treturn ret;", file=file)
+ print("}", file=file)
+
+def print_main_struct(file):
+ print("struct tdx_sys_info {", file=file)
+ for class_name, field_names in TDX_STRUCTS.items():
+ struct_name = "%s_%s" % (STRUCT_PREFIX, class_name)
+ struct_var = class_name
+ print("\tstruct %s %s;" % (struct_name, struct_var), file=file)
+ print("};", file=file)
+
+def print_main_function(file):
+ print("static int get_tdx_sys_info(struct tdx_sys_info *sysinfo)", file=file)
+ print("{", file=file)
+ print("\tint ret = 0;", file=file)
+ print(file=file)
+ for class_name, field_names in TDX_STRUCTS.items():
+ func_name = "%s_%s" % (FUNC_PREFIX, class_name)
+ struct_var = class_name
+ print("\tret = ret ?: %s(&sysinfo->%s);" % (func_name, struct_var), file=file)
+ print(file=file)
+ print("\treturn ret;", file=file)
+ print("}", file=file)
+
+jsonfile = sys.argv[1]
+hfile = sys.argv[2]
+cfile = sys.argv[3]
+hfileifdef = hfile.replace(".", "_")
+
+with open(jsonfile, "r") as f:
+ json_in = json.load(f)
+ fields = {x["Field Name"]: x for x in json_in["Fields"]}
+
+with open(hfile, "w") as f:
+ print("/* SPDX-License-Identifier: GPL-2.0 */", file=f)
+ print("/* Automatically generated TDX global metadata structures. */", file=f)
+ print("#ifndef _X86_VIRT_TDX_AUTO_GENERATED_" + hfileifdef.upper(), file=f)
+ print("#define _X86_VIRT_TDX_AUTO_GENERATED_" + hfileifdef.upper(), file=f)
+ print(file=f)
+ print("#include <linux/types.h>", file=f)
+ print(file=f)
+ for class_name, field_names in TDX_STRUCTS.items():
+ print_class_struct(class_name, [fields[x] for x in field_names], file=f)
+ print(file=f)
+ print_main_struct(file=f)
+ print(file=f)
+ print("#endif", file=f)
+
+with open(cfile, "w") as f:
+ print("// SPDX-License-Identifier: GPL-2.0", file=f)
+ print("/*", file=f)
+ print(" * Automatically generated functions to read TDX global metadata.", file=f)
+ print(" *", file=f)
+ print(" * This file doesn't compile on its own as it lacks of inclusion", file=f)
+ print(" * of SEAMCALL wrapper primitive which reads global metadata.", file=f)
+ print(" * Include this file to other C file instead.", file=f)
+ print(" */", file=f)
+ for class_name, field_names in TDX_STRUCTS.items():
+ print(file=f)
+ print_class_function(class_name, [fields[x] for x in field_names], file=f)
+ print(file=f)
+ print_main_function(file=f)