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| author | Daniel P. Berrangé <berrange@redhat.com> | 2025-06-10 13:37:03 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2025-06-12 13:40:16 -0400 |
| commit | 5dd9087fff74b5672526cad254e76f790fb35c7a (patch) | |
| tree | d47c31a4346ac2bfd7717d678bd1089128954199 | |
| parent | 3438eabaf4f8ae58b6c47f1727938d1d7dac4823 (diff) | |
| download | qemu-5dd9087fff74b5672526cad254e76f790fb35c7a.zip qemu-5dd9087fff74b5672526cad254e76f790fb35c7a.tar.gz qemu-5dd9087fff74b5672526cad254e76f790fb35c7a.tar.bz2 | |
hw/ppc/spapr_tpm_proxy: skip automatic zero-init of large arrays
The 'tpm_execute' method has a pair of 4k arrays used for copying
data between guest and host. Skip the automatic zero-init of these
arrays to eliminate the performance overhead in the I/O hot path.
The two arrays will be fully initialized when reading data from
guest memory or reading data from the proxy FD.
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: 20250610123709.835102-26-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| -rw-r--r-- | hw/ppc/spapr_tpm_proxy.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/ppc/spapr_tpm_proxy.c b/hw/ppc/spapr_tpm_proxy.c index 862eeaa..1297b3a 100644 --- a/hw/ppc/spapr_tpm_proxy.c +++ b/hw/ppc/spapr_tpm_proxy.c @@ -41,8 +41,8 @@ static ssize_t tpm_execute(SpaprTpmProxy *tpm_proxy, target_ulong *args) target_ulong data_in_size = args[2]; uint64_t data_out = ppc64_phys_to_real(args[3]); target_ulong data_out_size = args[4]; - uint8_t buf_in[TPM_SPAPR_BUFSIZE]; - uint8_t buf_out[TPM_SPAPR_BUFSIZE]; + QEMU_UNINITIALIZED uint8_t buf_in[TPM_SPAPR_BUFSIZE]; + QEMU_UNINITIALIZED uint8_t buf_out[TPM_SPAPR_BUFSIZE]; ssize_t ret; trace_spapr_tpm_execute(data_in, data_in_size, data_out, data_out_size); |