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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:36:55 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:40:15 -0400 |
| commit | 5a1f614d0cd0bcc8e84e0b7ab6af63d56bd348a2 (patch) | |
| tree | 0da94cca70c82b6797a9f8dd43a119c5a76c689d | |
| parent | 7048e70f391df76d009eecca25f8027858f9f304 (diff) | |
| download | qemu-5a1f614d0cd0bcc8e84e0b7ab6af63d56bd348a2.zip qemu-5a1f614d0cd0bcc8e84e0b7ab6af63d56bd348a2.tar.gz qemu-5a1f614d0cd0bcc8e84e0b7ab6af63d56bd348a2.tar.bz2 | |
hw/hyperv/syndbg: skip automatic zero-init of large array
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>
| -rw-r--r-- | hw/hyperv/syndbg.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c index 8b8a147..ac7e15f 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; |