[PULL 17/31] hw/hyperv/syndbg: skip automatic zero-init of large array

[Stefan Hajnoczi]

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

The 'handle_recv_msg' method has a 4k byte array used for copying
data between the network socket and guest memory. Skip the automatic
zero-init of this array to eliminate the performance overhead in the
I/O hot path.

The 'data_buf' array will be fully initialized when data is read
off the network socket.

Signed-off-by: Daniel P. Berrangé <berra...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
Message-id: 20250610123709.835102-18-berra...@redhat.com
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
 hw/hyperv/syndbg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c
index 8b8a14750d..ac7e15f6f1 100644
--- a/hw/hyperv/syndbg.c
+++ b/hw/hyperv/syndbg.c
@@ -192,7 +192,7 @@ static uint16_t handle_recv_msg(HvSynDbg *syndbg, uint64_t 
outgpa,
 {
     uint16_t ret;
     g_assert(MSG_BUFSZ >= qemu_target_page_size());
-    uint8_t data_buf[MSG_BUFSZ];
+    QEMU_UNINITIALIZED uint8_t data_buf[MSG_BUFSZ];
     hwaddr out_len;
     void *out_data;
     ssize_t recv_byte_count;
-- 
2.49.0