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target/i386/sev: Use local variable for kvm_sev_launch_measure

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The struct kvm_sev_launch_measure has a constant and small size, and
therefore we can use a regular local variable for it instead of
allocating and freeing heap memory for it.

Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20211011173026.2454294-3-dovmurik@linux.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Dov Murik 2021-10-11 17:30:26 +00:00 committed by Paolo Bonzini
parent eb8257a261
commit 59e42d88b6
1 changed files with 7 additions and 9 deletions
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16
target/i386/sev.c
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@ -729,7 +729,7 @@ sev_launch_get_measure(Notifier *notifier, void *unused)
SevGuestState *sev = sev_guest;
int ret, error;
g_autofree guchar *data = NULL;
g_autofree struct kvm_sev_launch_measure *measurement = NULL;
struct kvm_sev_launch_measure measurement = {};
if (!sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
return;
@ -743,23 +743,21 @@ sev_launch_get_measure(Notifier *notifier, void *unused)
}
}
measurement = g_new0(struct kvm_sev_launch_measure, 1);
/* query the measurement blob length */
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
measurement, &error);
if (!measurement->len) {
&measurement, &error);
if (!measurement.len) {
error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
__func__, ret, error, fw_error_to_str(errno));
return;
}
data = g_new0(guchar, measurement->len);
measurement->uaddr = (unsigned long)data;
data = g_new0(guchar, measurement.len);
measurement.uaddr = (unsigned long)data;
/* get the measurement blob */
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
measurement, &error);
&measurement, &error);
if (ret) {
error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
__func__, ret, error, fw_error_to_str(errno));
@ -769,7 +767,7 @@ sev_launch_get_measure(Notifier *notifier, void *unused)
sev_set_guest_state(sev, SEV_STATE_LAUNCH_SECRET);
/* encode the measurement value and emit the event */
sev->measurement = g_base64_encode(data, measurement->len);
sev->measurement = g_base64_encode(data, measurement.len);
trace_kvm_sev_launch_measurement(sev->measurement);
}