x86/topology: Set cpu_die_id only if DIE_TYPE found

stable inclusion
from stable-v5.10.154
commit f5ad52da145a460b11d3a02a74c995fc33cce2f0
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I64YCB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f5ad52da145a460b11d3a02a74c995fc33cce2f0

--------------------------------

[ Upstream commit cb09a379 ]

CPUID Leaf 0x1F defines a DIE_TYPE level (nb: ECX[8:15] level type == 0x5),
but CPUID Leaf 0xB does not. However, detect_extended_topology() will
set struct cpuinfo_x86.cpu_die_id regardless of whether a valid Die ID
was found.

Only set cpu_die_id if a DIE_TYPE level is found. CPU topology code may
use another value for cpu_die_id, e.g. the AMD NodeId on AMD-based
systems. Code ordering should be maintained so that the CPUID Leaf 0x1F
Die ID value will take precedence on systems that may use another value.
Suggested-by: NBorislav Petkov <bp@alien8.de>
Signed-off-by: NYazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201109210659.754018-5-Yazen.Ghannam@amd.com
Stable-dep-of: 2b12a7a1 ("x86/topology: Fix multiple packages shown on a single-package system")
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NLipeng Sang <sanglipeng1@jd.com>

arch/x86/kernel/cpu/topology.c

@@ -96,6 +96,7 @@ int detect_extended_topology(struct cpuinfo_x86 *c)
 	unsigned int ht_mask_width, core_plus_mask_width, die_plus_mask_width;
 	unsigned int core_select_mask, core_level_siblings;
 	unsigned int die_select_mask, die_level_siblings;
+	bool die_level_present = false;
 	int leaf;
 
 	leaf = detect_extended_topology_leaf(c);
@@ -126,6 +127,7 @@ int detect_extended_topology(struct cpuinfo_x86 *c)
 			die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
 		}
 		if (LEAFB_SUBTYPE(ecx) == DIE_TYPE) {
+			die_level_present = true;
 			die_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
 			die_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
 		}
@@ -139,8 +141,12 @@ int detect_extended_topology(struct cpuinfo_x86 *c)
 
 	c->cpu_core_id = apic->phys_pkg_id(c->initial_apicid,
 				ht_mask_width) & core_select_mask;
-	c->cpu_die_id = apic->phys_pkg_id(c->initial_apicid,
-				core_plus_mask_width) & die_select_mask;
+
+	if (die_level_present) {
+		c->cpu_die_id = apic->phys_pkg_id(c->initial_apicid,
+					core_plus_mask_width) & die_select_mask;
+	}
+
 	c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid,
 				die_plus_mask_width);
 	/*