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/usb/hcd-ohci: skip automatic zero-init of large array

Browse Source 
The 'ohci_service_iso_td' method has a 8k byte array used for copying
data between guest and host. Skip the automatic zero-init of this
array to eliminate the performance overhead in the I/O hot path.

The 'buf' array will be fully initialized when reading data from guest
memory.

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: 20250610123709.835102-27-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 5dd9087fff
commit 14997d521d
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
hw/usb/hcd-ohci.c
+1 -1
View File
@@ -577,7 +577,7 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed)
USBDevice *dev;
USBEndpoint *ep;
USBPacket *pkt;
uint8_t buf[8192];
QEMU_UNINITIALIZED uint8_t buf[8192];
bool int_req;
struct ohci_iso_td iso_td;
uint32_t addr;