motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 15:23:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

2
hw/hyperv/syndbg.c
View file

@ -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;