diff mbox series

[v9,5/7] i386: Add support for CPUID_8000_001E for AMD

Message ID 20180514164156.27034-6-babu.moger@amd.com
State New
Headers show
Series i386: Enable TOPOEXT to support hyperthreading on AMD CPU | expand

Commit Message

Moger, Babu May 14, 2018, 4:41 p.m. UTC 
Populate threads/core_id/apic_ids/socket_id when CPUID_EXT3_TOPOEXT
feature is supported. This is required to support hyperthreading feature
on AMD CPUs. This is supported via CPUID_8000_001E extended functions.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Tested-by: Geoffrey McRae <geoff@hostfission.com>
---
 include/hw/i386/topology.h | 6 ++++++
 target/i386/cpu.c          | 8 ++++++++
 2 files changed, 14 insertions(+)
diff mbox series

Patch

diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h
index 1ebaee0f76..4af746e50c 100644
--- a/include/hw/i386/topology.h
+++ b/include/hw/i386/topology.h
@@ -145,4 +145,10 @@  static inline apic_id_t x86_apicid_from_cpu_idx(unsigned nr_cores,
     return apicid_from_topo_ids(nr_cores, nr_threads, &topo);
 }
 
+/* Definitions used on CPUID Leaf 0x8000001E */
+#define EXTENDED_APIC_ID(threads, socket_id, core_id, thread_id) \
+                        ((threads) ? \
+                         ((socket_id << 6) | (core_id << 1) | thread_id) : \
+                         ((socket_id << 6) | core_id))
+
 #endif /* HW_I386_TOPOLOGY_H */
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index c06a9f5ebe..18a7872b7d 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -4071,6 +4071,14 @@  void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             break;
         }
         break;
+    case 0x8000001E:
+        assert(cpu->core_id <= 255);
+        *eax = EXTENDED_APIC_ID((cs->nr_threads - 1),
+               cpu->socket_id, cpu->core_id, cpu->thread_id);
+        *ebx = (cs->nr_threads - 1) << 8 | cpu->core_id;
+        *ecx = cpu->socket_id;
+        *edx = 0;
+        break;
     case 0xC0000000:
         *eax = env->cpuid_xlevel2;
         *ebx = 0;