From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; The QEMU driver has a list of devices nodes that are whitelisted for all guests. The kernel has recently started returning an error if you try to whitelist a device which does not exist. This causes a warning in libvirt logs and an audit error for any missing devices. eg 2013-02-27 16:08:26.515+0000: 29625: warning : virDomainAuditCgroup:451 : success=no virt=kvm resrc=cgroup reason=allow vm="vm031714" uuid=9d8f1de0-44f4-a0b1-7d50-e41ee6cd897b cgroup="/sys/fs/cgroup/devices/libvirt/qemu/vm031714/" class=path path=/dev/kqemu rdev=? acl=rw Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- src/qemu/qemu_cgroup.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c index 671d613..9d6e88b 100644 --- a/src/qemu/qemu_cgroup.c +++ b/src/qemu/qemu_cgroup.c @@ -265,6 +265,12 @@ int qemuSetupCgroup(virQEMUDriverPtr driver, } for (i = 0; deviceACL[i] != NULL ; i++) { + if (access(deviceACL[i], F_OK) < 0) { + VIR_DEBUG("Ignoring non-existant device %s", + deviceACL[i]); + continue; + } + rc = virCgroupAllowDevicePath(cgroup, deviceACL[i], VIR_CGROUP_DEVICE_RW); virDomainAuditCgroupPath(vm, cgroup, "allow", deviceACL[i], "rw", rc); -- 1.7.11.7