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[v4,3/5] target/i386: Add support for CPUID_8000_001E for AMD

Message ID 1520888449-4352-4-git-send-email-babu.moger@amd.com (mailing list archive)
State New, archived
Headers show

Commit Message

Babu Moger March 12, 2018, 9 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 | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 5fdbedd..ba63d0c 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -3655,6 +3655,13 @@  void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             break;
         }
         break;
+    case 0x8000001E:
+        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;