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hw/hyperv/syndbg: skip automatic zero-init of large array

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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 <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-18-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:36:55 +01:00 • committed by Stefan Hajnoczi
parent 7048e70f39
commit 5a1f614d0c
1 changed files with 1 additions and 1 deletions
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2
hw/hyperv/syndbg.c
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@ -192,7 +192,7 @@ static uint16_t handle_recv_msg(HvSynDbg *syndbg, uint64_t outgpa,
{ {
uint16_t ret; uint16_t ret;
g_assert(MSG_BUFSZ >= qemu_target_page_size()); 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; hwaddr out_len;
void *out_data; void *out_data;
ssize_t recv_byte_count; ssize_t recv_byte_count;