[PULL 05/26] i386/cpu: Expose AVX_VNNI instruction to guest

[Paolo Bonzini]

From: Yang Zhong <yang.zhong@intel.com>

Expose AVX (VEX-encoded) versions of the Vector Neural Network
Instructions to guest.

The bit definition:
CPUID.(EAX=7,ECX=1):EAX[bit 4] AVX_VNNI

The following instructions are available when this feature is
present in the guest.
  1. VPDPBUS: Multiply and Add Unsigned and Signed Bytes
  2. VPDPBUSDS: Multiply and Add Unsigned and Signed Bytes with Saturation
  3. VPDPWSSD: Multiply and Add Signed Word Integers
  4. VPDPWSSDS: Multiply and Add Signed Integers with Saturation

As for the kvm related code, please reference Linux commit id 1085a6b585d7.

The release document ref below link:
https://software.intel.com/content/www/us/en/develop/download/\
intel-architecture-instruction-set-extensions-programming-reference.html

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20210407015609.22936-1-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/cpu.c | 4 ++--
 target/i386/cpu.h | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index c496bfa1c2..9e211ac2ce 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -940,7 +940,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .type = CPUID_FEATURE_WORD,
         .feat_names = {
             NULL, NULL, NULL, NULL,
-            NULL, "avx512-bf16", NULL, NULL,
+            "avx-vnni", "avx512-bf16", NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL, NULL,
@@ -3194,7 +3194,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
             MSR_ARCH_CAP_SKIP_L1DFL_VMENTRY | MSR_ARCH_CAP_MDS_NO |
             MSR_ARCH_CAP_PSCHANGE_MC_NO | MSR_ARCH_CAP_TAA_NO,
         .features[FEAT_7_1_EAX] =
-            CPUID_7_1_EAX_AVX512_BF16,
+            CPUID_7_1_EAX_AVX_VNNI | CPUID_7_1_EAX_AVX512_BF16,
         /*
          * Missing: XSAVES (not supported by some Linux versions,
          * including v4.1 to v4.12).
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 324ef92beb..d4e80e1344 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -817,6 +817,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
 /* Speculative Store Bypass Disable */
 #define CPUID_7_0_EDX_SPEC_CTRL_SSBD    (1U << 31)
 
+/* AVX VNNI Instruction */
+#define CPUID_7_1_EAX_AVX_VNNI          (1U << 4)
 /* AVX512 BFloat16 Instruction */
 #define CPUID_7_1_EAX_AVX512_BF16       (1U << 5)
 
-- 
2.31.1