[PATCH v2 1/5] cpuinfo/i386: Detect GFNI as an AVX extension

[Richard Henderson <richard.henderson@linaro.org>]

We won't use the SSE GFNI instructions, so delay
detection until we know AVX is present.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 host/include/i386/host/cpuinfo.h | 1 +
 include/qemu/cpuid.h             | 3 +++
 util/cpuinfo-i386.c              | 1 +
 3 files changed, 5 insertions(+)

diff --git a/host/include/i386/host/cpuinfo.h b/host/include/i386/host/cpuinfo.h
index 9541a64da6..93d029d499 100644
--- a/host/include/i386/host/cpuinfo.h
+++ b/host/include/i386/host/cpuinfo.h
@@ -27,6 +27,7 @@
 #define CPUINFO_ATOMIC_VMOVDQU  (1u << 17)
 #define CPUINFO_AES             (1u << 18)
 #define CPUINFO_PCLMUL          (1u << 19)
+#define CPUINFO_GFNI            (1u << 20)
 
 /* Initialized with a constructor. */
 extern unsigned cpuinfo;
diff --git a/include/qemu/cpuid.h b/include/qemu/cpuid.h
index b11161555b..de7a900509 100644
--- a/include/qemu/cpuid.h
+++ b/include/qemu/cpuid.h
@@ -68,6 +68,9 @@
 #ifndef bit_AVX512VBMI2
 #define bit_AVX512VBMI2 (1 << 6)
 #endif
+#ifndef bit_GFNI
+#define bit_GFNI        (1 << 8)
+#endif
 
 /* Leaf 0x80000001, %ecx */
 #ifndef bit_LZCNT
diff --git a/util/cpuinfo-i386.c b/util/cpuinfo-i386.c
index c8c8a1b370..f4c5b6ff40 100644
--- a/util/cpuinfo-i386.c
+++ b/util/cpuinfo-i386.c
@@ -50,6 +50,7 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
             if ((bv & 6) == 6) {
                 info |= CPUINFO_AVX1;
                 info |= (b7 & bit_AVX2 ? CPUINFO_AVX2 : 0);
+                info |= (c7 & bit_GFNI ? CPUINFO_GFNI : 0);
 
                 if ((bv & 0xe0) == 0xe0) {
                     info |= (b7 & bit_AVX512F ? CPUINFO_AVX512F : 0);
-- 
2.43.0