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hw/net/xgamc: skip automatic zero-init of large array

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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 <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-23-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:37:00 +01:00 • committed by Stefan Hajnoczi
parent 21cf31c51a
commit 8b723287b8
1 changed files with 1 additions and 1 deletions
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2
hw/net/xgmac.c
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@ -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;