diff mbox series

[v3,4/4] hw/smbios: Fix core count in type4

Message ID 20230620103958.3907565-5-zhao1.liu@linux.intel.com
State New
Headers show
Series hw/smbios: Cleanup topology related variables | expand

Commit Message

Zhao Liu June 20, 2023, 10:39 a.m. UTC 
From: Zhao Liu <zhao1.liu@intel.com>

From SMBIOS 3.0 specification, core count field means:

Core Count is the number of cores detected by the BIOS for this
processor socket. [1]

Before 003f230e37d7 ("machine: Tweak the order of topology members in
struct CpuTopology"), MachineState.smp.cores means "the number of cores
in one package", and it's correct to use smp.cores for core count.

But 003f230e37d7 changes the smp.cores' meaning to "the number of cores
in one die" and doesn't change the original smp.cores' use in smbios as
well, which makes core count in type4 go wrong.

Fix this issue with the correct "cores per socket" caculation.

[1] SMBIOS 3.0.0, section 7.5.6, Processor Information - Core Count

Fixes: 003f230e37d7 ("machine: Tweak the order of topology members in struct CpuTopology")
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
v3:
 * Use the wrapped helper to get cores per socket.

v2:
 * Calculate cores_per_socket in a different way from
   threads_per_socket.
 * Add the sanity check to ensure consistency of results between these 2
   ways. This can help not miss any future change of cpu topology.
---
 hw/smbios/smbios.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 3aae9328c014..10cd22f610ef 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -714,6 +714,7 @@  static void smbios_build_type_4_table(MachineState *ms, unsigned instance)
     char sock_str[128];
     size_t tbl_len = SMBIOS_TYPE_4_LEN_V28;
     unsigned threads_per_socket;
+    unsigned cores_per_socket;
 
     if (smbios_ep_type == SMBIOS_ENTRY_POINT_TYPE_64) {
         tbl_len = SMBIOS_TYPE_4_LEN_V30;
@@ -749,8 +750,9 @@  static void smbios_build_type_4_table(MachineState *ms, unsigned instance)
     SMBIOS_TABLE_SET_STR(4, part_number_str, type4.part);
 
     threads_per_socket = machine_topo_get_threads_per_socket(ms);
+    cores_per_socket = machine_topo_get_cores_per_socket(ms);
 
-    t->core_count = (ms->smp.cores > 255) ? 0xFF : ms->smp.cores;
+    t->core_count = (cores_per_socket > 255) ? 0xFF : cores_per_socket;
     t->core_enabled = t->core_count;
 
     t->thread_count = (threads_per_socket > 255) ? 0xFF : threads_per_socket;
@@ -759,7 +761,7 @@  static void smbios_build_type_4_table(MachineState *ms, unsigned instance)
     t->processor_family2 = cpu_to_le16(0x01); /* Other */
 
     if (tbl_len == SMBIOS_TYPE_4_LEN_V30) {
-        t->core_count2 = t->core_enabled2 = cpu_to_le16(ms->smp.cores);
+        t->core_count2 = t->core_enabled2 = cpu_to_le16(cores_per_socket);
         t->thread_count2 = cpu_to_le16(threads_per_socket);
     }