[Qemu-devel] [PATCH 6/7] [RFC] i386: Add EPYC-IBPB CPU model

[Eduardo Habkost]

RFC NOTE: More info is required to confirm if this is necessary
to mitigate mitigate CVE-2017-5715 on AMD CPUs.

EPYC-IBPB is a copy of the EPYC CPU model with
just CPUID_8000_0008_EBX_IBPB added.

Cc: Jiri Denemark <address@hidden>
Cc: Tom Lendacky <address@hidden>
Cc: Brijesh Singh <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>
---
 target/i386/cpu.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index eb1bef6aa5..9c36f9bd44 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1964,6 +1964,52 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .xlevel = 0x8000000A,
         .model_id = "AMD EPYC Processor",
     },
+    {
+        .name = "EPYC-IBPB",
+        .level = 0xd,
+        .vendor = CPUID_VENDOR_AMD,
+        .family = 23,
+        .model = 1,
+        .stepping = 2,
+        .features[FEAT_1_EDX] =
+            CPUID_SSE2 | CPUID_SSE | CPUID_FXSR | CPUID_MMX | CPUID_CLFLUSH |
+            CPUID_PSE36 | CPUID_PAT | CPUID_CMOV | CPUID_MCA | CPUID_PGE |
+            CPUID_MTRR | CPUID_SEP | CPUID_APIC | CPUID_CX8 | CPUID_MCE |
+            CPUID_PAE | CPUID_MSR | CPUID_TSC | CPUID_PSE | CPUID_DE |
+            CPUID_VME | CPUID_FP87,
+        .features[FEAT_1_ECX] =
+            CPUID_EXT_RDRAND | CPUID_EXT_F16C | CPUID_EXT_AVX |
+            CPUID_EXT_XSAVE | CPUID_EXT_AES |  CPUID_EXT_POPCNT |
+            CPUID_EXT_MOVBE | CPUID_EXT_SSE42 | CPUID_EXT_SSE41 |
+            CPUID_EXT_CX16 | CPUID_EXT_FMA | CPUID_EXT_SSSE3 |
+            CPUID_EXT_MONITOR | CPUID_EXT_PCLMULQDQ | CPUID_EXT_SSE3,
+        .features[FEAT_8000_0001_EDX] =
+            CPUID_EXT2_LM | CPUID_EXT2_RDTSCP | CPUID_EXT2_PDPE1GB |
+            CPUID_EXT2_FFXSR | CPUID_EXT2_MMXEXT | CPUID_EXT2_NX |
+            CPUID_EXT2_SYSCALL,
+        .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,
+        .features[FEAT_8000_0008_EBX] =
+            CPUID_8000_0008_EBX_IBPB,
+        .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 |
+            CPUID_7_0_EBX_ADX | CPUID_7_0_EBX_SMAP | CPUID_7_0_EBX_CLFLUSHOPT |
+            CPUID_7_0_EBX_SHA_NI,
+        /* Missing: XSAVES (not supported by some Linux versions,
+         * including v4.1 to v4.12).
+         * KVM doesn't yet expose any XSAVES state save component.
+         */
+        .features[FEAT_XSAVE] =
+            CPUID_XSAVE_XSAVEOPT | CPUID_XSAVE_XSAVEC |
+            CPUID_XSAVE_XGETBV1,
+        .features[FEAT_6_EAX] =
+            CPUID_6_EAX_ARAT,
+        .xlevel = 0x8000000A,
+        .model_id = "AMD EPYC Processor (with IBPB)",
+    },
 };
 
 typedef struct PropValue {
-- 
2.14.3