diff mbox series

[v3,3/5] target/i386: Add support for CPUID_8000_001E for AMD

Message ID 1520281107-5115-4-git-send-email-babu.moger@amd.com
State New
Headers show
Series Enable TOPOEXT to support hyperthreading on AMD CPU | expand

Commit Message

Moger, Babu March 5, 2018, 8:18 p.m. UTC 
From: Stanislav Lanci <pixo@polepetko.eu>

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: Stanislav Lanci <pixo@polepetko.eu>
Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 target/i386/cpu.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 1485175..555ab83 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -3666,6 +3666,15 @@  void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             *edx = 0;
         }
         break;
+    case 0x8000001E:
+        if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) {
+            assert(cpu->core_id <= 255);
+            *eax = cpu->apic_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;