We can only pass values up to LLONG_MAX through JSON and QEMU checks if the int64_t number is not negative at startup since 1.5.0. https://bugzilla.redhat.com/show_bug.cgi?id=974010 --- src/qemu/qemu_driver.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 3d9457f..b4b66aa 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -14099,6 +14099,13 @@ qemuDomainSetBlockIoTune(virDomainPtr dom, for (i = 0; i < nparams; i++) { virTypedParameterPtr param = &params[i]; + if (param->value.ul > LLONG_MAX) { + virReportError(VIR_ERR_OVERFLOW, + _("block I/O throttle limit value must" + " be less than %llu"), LLONG_MAX); + goto endjob; + } + if (STREQ(param->field, VIR_DOMAIN_BLOCK_IOTUNE_TOTAL_BYTES_SEC)) { info.total_bytes_sec = param->value.ul; set_bytes = true;