Re: QEMU/KVM startup error in F27

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On 11/21/2017 12:31 PM, Cole Robinson wrote:
> On 11/14/2017 05:31 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.
>>
> 
> If you're still hitting this, please file a libvirt bug and we can
> follow up from there, certainly sounds like something weird is going on

I doubt it's a file context issue so a relabel wouldn't help. It's more
of a kernel thing. It's probably controllable via one of the SELinux
virt_* booleans. An AVC denial message would sure help to sort it out.
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