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[v9,6/7] i386: Enable TOPOEXT feature on AMD EPYC CPU

Message ID 20180514164156.27034-7-babu.moger@amd.com (mailing list archive)
State New, archived
Headers show

Commit Message

Babu Moger May 14, 2018, 4:41 p.m. UTC 
Enable TOPOEXT feature on EPYC CPU. This is required to support
hyperthreading on VM guests. Also extend xlevel to 0x8000001E.

Disable TOPOEXT feature for legacy (2.12 or older) machine types.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Tested-by: Geoffrey McRae <geoff@hostfission.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
---
 include/hw/i386/pc.h |  4 ++++
 target/i386/cpu.c    | 11 +++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index df15deefca..c01adc92ba 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -310,6 +310,10 @@  bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .driver   = TYPE_X86_CPU,\
         .property = "legacy-cache",\
         .value    = "on",\
+    },{\
+        .driver   = "EPYC-" TYPE_X86_CPU,\
+        .property = "topoext",\
+        .value    = "off",\
     },
 
 #define PC_COMPAT_2_11 \
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 18a7872b7d..de2749ae81 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2424,7 +2424,8 @@  static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_8000_0001_ECX] =
             CPUID_EXT3_OSVW | CPUID_EXT3_3DNOWPREFETCH |
             CPUID_EXT3_MISALIGNSSE | CPUID_EXT3_SSE4A | CPUID_EXT3_ABM |
-            CPUID_EXT3_CR8LEG | CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM,
+            CPUID_EXT3_CR8LEG | CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM |
+            CPUID_EXT3_TOPOEXT,
         .features[FEAT_7_0_EBX] =
             CPUID_7_0_EBX_FSGSBASE | CPUID_7_0_EBX_BMI1 | CPUID_7_0_EBX_AVX2 |
             CPUID_7_0_EBX_SMEP | CPUID_7_0_EBX_BMI2 | CPUID_7_0_EBX_RDSEED |
@@ -2469,7 +2470,8 @@  static X86CPUDefinition builtin_x86_defs[] = {
         .features[FEAT_8000_0001_ECX] =
             CPUID_EXT3_OSVW | CPUID_EXT3_3DNOWPREFETCH |
             CPUID_EXT3_MISALIGNSSE | CPUID_EXT3_SSE4A | CPUID_EXT3_ABM |
-            CPUID_EXT3_CR8LEG | CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM,
+            CPUID_EXT3_CR8LEG | CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM |
+            CPUID_EXT3_TOPOEXT,
         .features[FEAT_8000_0008_EBX] =
             CPUID_8000_0008_EBX_IBPB,
         .features[FEAT_7_0_EBX] =
@@ -4540,6 +4542,11 @@  static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
             x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000000A);
         }
 
+        /* TOPOEXT feature requires 0x8000001E */
+        if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) {
+            x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000001E);
+        }
+
         /* SEV requires CPUID[0x8000001F] */
         if (sev_enabled()) {
             x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000001F);