QEMU now requires an x86-64-v2 host, which has SSE2.
Use it freely in buffer_is_zero.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 host/include/i386/host/cpuinfo.h | 1 -
 util/bufferiszero.c              | 2 +-
 util/cpuinfo-i386.c              | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/host/include/i386/host/cpuinfo.h b/host/include/i386/host/cpuinfo.h
index 81771733eaa..72f6fad61e5 100644
--- a/host/include/i386/host/cpuinfo.h
+++ b/host/include/i386/host/cpuinfo.h
@@ -14,7 +14,6 @@
 #define CPUINFO_POPCNT          (1u << 4)
 #define CPUINFO_BMI1            (1u << 5)
 #define CPUINFO_BMI2            (1u << 6)
-#define CPUINFO_SSE2            (1u << 7)
 #define CPUINFO_AVX1            (1u << 9)
 #define CPUINFO_AVX2            (1u << 10)
 #define CPUINFO_AVX512F         (1u << 11)
diff --git a/util/bufferiszero.c b/util/bufferiszero.c
index 74864f7b782..6245976eca1 100644
--- a/util/bufferiszero.c
+++ b/util/bufferiszero.c
@@ -195,7 +195,7 @@ static unsigned best_accel(void)
         return 2;
     }
 #endif
-    return info & CPUINFO_SSE2 ? 1 : 0;
+    return 1;
 }
 
 #elif defined(__aarch64__) && defined(__ARM_NEON)
diff --git a/util/cpuinfo-i386.c b/util/cpuinfo-i386.c
index 90f92a42dc8..ca74ef04f54 100644
--- a/util/cpuinfo-i386.c
+++ b/util/cpuinfo-i386.c
@@ -34,7 +34,6 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
     if (max >= 1) {
         __cpuid(1, a, b, c, d);
 
-        info |= (d & bit_SSE2 ? CPUINFO_SSE2 : 0);
         info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0);
         info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0);
         info |= (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0);
-- 
2.45.1

On Fri, May 31, 2024 at 11:14:55AM +0200, Paolo Bonzini wrote:
> Date: Fri, 31 May 2024 11:14:55 +0200
> From: Paolo Bonzini <pbonzini@redhat.com>
> Subject: [PATCH 4/6] host/i386: assume presence of SSE2
> X-Mailer: git-send-email 2.45.1
> 
> QEMU now requires an x86-64-v2 host, which has SSE2.
> Use it freely in buffer_is_zero.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  host/include/i386/host/cpuinfo.h | 1 -
>  util/bufferiszero.c              | 2 +-
>  util/cpuinfo-i386.c              | 1 -
>  3 files changed, 1 insertion(+), 3 deletions(-)

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>