On Tue, 2017-11-14 at 14:50 -0800, Rick Stevens wrote:
On 11/14/2017 02:31 PM, Patrick O'Callaghan wrote:
> On trying to fire up a VM using virt-manager, I get "unable to map
> backing store for guest RAM: Permission denied".
> I use hugepages to lock down memory for the VM, which may be relevant
> for the error. This worked correctly on F26 just before the upgrade to
> F27. I have changed nothing in my VM configuration, nor in the config
> file for QEMU. However, temporarily turning off SElinux allows the
> startup to proceed, after which I can re-enable SElinux with no ill
> effects, i.e. the VM runs correctly.
> A complete relabel of my system (touch /.autolabel and reboot) has made
> no difference.
Have you checked the AVC reports from selinux? It smells like a bad
policy re: hugepages for KVMs. It's difficult to say without the actual
Not seeing anything. The only AVC reports in journalctl are about some
dbus stuff unrelated to libvirtd. Interestingly the libvirtd startup
lines in journalctl show:
... error : virAuditOpen:62 : Unable to initialise audit layer: Protocol not supported
but it's not clear whether that has any relevance. As I say, toggling
setenforce lets libvirtd start and from then on everything works.