hw/ufs/lu: skip automatic zero-init of large array
The 'ufs_emulate_scsi_cmd' method has a 4k byte array used for
copying data from the device. Skip the automatic zero-init of
this array to eliminate the performance overhead in the I/O hot
path.
The 'outbuf' array will be fully initialized when data is copied
from the guest.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Message-id: 20250610123709.835102-30-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/hw/ufs/lu.c b/hw/ufs/lu.c
index 57b307e..2d8ffd7 100644
--- a/hw/ufs/lu.c
+++ b/hw/ufs/lu.c
@@ -194,7 +194,7 @@
static UfsReqResult ufs_emulate_scsi_cmd(UfsLu *lu, UfsRequest *req)
{
uint8_t lun = lu->lun;
- uint8_t outbuf[4096];
+ QEMU_UNINITIALIZED uint8_t outbuf[4096];
uint8_t sense_buf[UFS_SENSE_SIZE];
uint8_t scsi_status;
int len = 0;
