[PULL 22/31] hw/net/xgamc: skip automatic zero-init of large array

[Stefan Hajnoczi]

From: Daniel P. Berrangé <berra...@redhat.com>

The 'xgmac_enet_send' method has a 8k byte array used for copying
data between guest and host. Skip the automatic zero-init of this
array to eliminate the performance overhead in the I/O hot path.

The 'frame' buffer will be fully initialized when reading guest
memory to fetch the data to send.

Signed-off-by: Daniel P. Berrangé <berra...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
Message-id: 20250610123709.835102-23-berra...@redhat.com
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
 hw/net/xgmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/xgmac.c b/hw/net/xgmac.c
index 9c87c4e70f..d45f872467 100644
--- a/hw/net/xgmac.c
+++ b/hw/net/xgmac.c
@@ -207,7 +207,7 @@ static void xgmac_enet_send(XgmacState *s)
     struct desc bd;
     int frame_size;
     int len;
-    uint8_t frame[8192];
+    QEMU_UNINITIALIZED uint8_t frame[8192];
     uint8_t *ptr;
 
     ptr = frame;
-- 
2.49.0