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[Qemu-devel] [PULL 26/30] x86: add AVX512_4VNNIW and AVX512_4FMAPS featu


From: Paolo Bonzini
Subject: [Qemu-devel] [PULL 26/30] x86: add AVX512_4VNNIW and AVX512_4FMAPS features
Date: Tue, 1 Nov 2016 17:29:39 +0100

From: Luwei Kang <address@hidden>

The spec can be found in Intel Software Developer Manual or in
Instruction Set Extensions Programming Reference.

Signed-off-by: Piotr Luc <address@hidden>
Signed-off-by: Luwei Kang <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 target-i386/cpu.c | 19 ++++++++++++++++++-
 target-i386/cpu.h |  4 ++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 0f8a8fb..14c5186 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -239,6 +239,7 @@ static void x86_cpu_vendor_words2str(char *dst, uint32_t 
vendor1,
           CPUID_7_0_EBX_INVPCID, CPUID_7_0_EBX_RTM,
           CPUID_7_0_EBX_RDSEED */
 #define TCG_7_0_ECX_FEATURES (CPUID_7_0_ECX_PKU | CPUID_7_0_ECX_OSPKE)
+#define TCG_7_0_EDX_FEATURES 0
 #define TCG_APM_FEATURES 0
 #define TCG_6_EAX_FEATURES CPUID_6_EAX_ARAT
 #define TCG_XSAVE_FEATURES (CPUID_XSAVE_XSAVEOPT | CPUID_XSAVE_XGETBV1)
@@ -444,6 +445,22 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .cpuid_reg = R_ECX,
         .tcg_features = TCG_7_0_ECX_FEATURES,
     },
+    [FEAT_7_0_EDX] = {
+        .feat_names = {
+            NULL, NULL, "avx512-4vnniw", "avx512-4fmaps",
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+            NULL, NULL, NULL, NULL,
+        },
+        .cpuid_eax = 7,
+        .cpuid_needs_ecx = true, .cpuid_ecx = 0,
+        .cpuid_reg = R_EDX,
+        .tcg_features = TCG_7_0_EDX_FEATURES,
+    },
     [FEAT_8000_0007_EDX] = {
         .feat_names = {
             NULL, NULL, NULL, NULL,
@@ -2560,7 +2577,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, 
uint32_t count,
             if ((*ecx & CPUID_7_0_ECX_PKU) && env->cr[4] & CR4_PKE_MASK) {
                 *ecx |= CPUID_7_0_ECX_OSPKE;
             }
-            *edx = 0; /* Reserved */
+            *edx = env->features[FEAT_7_0_EDX]; /* Feature flags */
         } else {
             *eax = 0;
             *ebx = 0;
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 6303d65..c605724 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -443,6 +443,7 @@ typedef enum FeatureWord {
     FEAT_1_ECX,         /* CPUID[1].ECX */
     FEAT_7_0_EBX,       /* CPUID[EAX=7,ECX=0].EBX */
     FEAT_7_0_ECX,       /* CPUID[EAX=7,ECX=0].ECX */
+    FEAT_7_0_EDX,       /* CPUID[EAX=7,ECX=0].EDX */
     FEAT_8000_0001_EDX, /* CPUID[8000_0001].EDX */
     FEAT_8000_0001_ECX, /* CPUID[8000_0001].ECX */
     FEAT_8000_0007_EDX, /* CPUID[8000_0007].EDX */
@@ -629,6 +630,9 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_ECX_OSPKE    (1U << 4)
 #define CPUID_7_0_ECX_RDPID    (1U << 22)
 
+#define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural Network 
Instructions */
+#define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation 
Single Precision */
+
 #define CPUID_XSAVE_XSAVEOPT   (1U << 0)
 #define CPUID_XSAVE_XSAVEC     (1U << 1)
 #define CPUID_XSAVE_XGETBV1    (1U << 2)
-- 
2.7.4





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