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hw/scsi/lsi53c895a: skip automatic zero-init of large array

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The 'lsi_memcpy' method has a 4k byte array used for copying data
to/from the device. 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 data is copied.

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: 20250610123709.835102-28-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2025-06-10 13:37:05 +01:00 • committed by Stefan Hajnoczi
parent 14997d521d
commit 55243edf42
1 changed files with 1 additions and 1 deletions
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2
hw/scsi/lsi53c895a.c
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@ -1112,7 +1112,7 @@ bad:
static void lsi_memcpy(LSIState *s, uint32_t dest, uint32_t src, int count)
{
int n;
uint8_t buf[LSI_BUF_SIZE];
QEMU_UNINITIALIZED uint8_t buf[LSI_BUF_SIZE];
trace_lsi_memcpy(dest, src, count);
while (count) {