izzy/xemu
0
0
Fork 0
mirror of https://github.com/izzy2lost/xemu.git synced 2026-07-06 00:20:22 -07:00
Code Issues Packages Projects Releases Wiki Activity

hw/ufs/lu: skip automatic zero-init of large array

Browse Source 
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>
This commit is contained in:
Daniel P. Berrangé
2025-06-12 13:40:16 -04:00
committed by Stefan Hajnoczi
parent ca0559e235
commit 7708e29818
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
hw/ufs/lu.c
+1 -1
View File
@@ -194,7 +194,7 @@ static int ufs_emulate_wlun_inquiry(UfsRequest *req, uint8_t *outbuf,
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;