Hyper-v VM does not have uuid set which breaks virt-who mapping

Environment

Hypervisor details:

"hypervisor.type": "hyperv",
"hypervisor.version": "10.0.14393.1532"

For the VM:

RHEL 7.2 VM running on hyper-v

Issue

The RHEL VMs running on hyper-v do not have uuid set which breaks the virt-who mapping

# dmidecode| egrep -i uuid | tr '[:upper:]' '[:lower:]'

uuid: not settable

# subscription-manager facts:

...
virt.host_type: hyperv
virt.is_guest: True
virt.uuid: Not Settable

Resolution

Print out the virt-who mapping with # virt-who -op

...
 "facts": {
                "cpu.cpu_socket(s)": "2",
                "hypervisor.type": "hyperv",
                "hypervisor.version": "10.0.14393.1532"
            },
            "guests": [
                {
                    "attributes": {
                        "active": 1,
                        "virtWhoType": "hyperv"
                    },
                    "guestId": "4546B285-6C41-5D6R-86G5-0BFR4B3625FD",
                    "state": 1
                },
...

From above output we can see a "guestId": "4546B285-6C41-5D6R-86G5-0BFR4B3625FD" for each VM on hyper-v

We can workaround the issue by setting one of these uuid's manually on each VM:

# echo '{"virt.uuid": "4546B285-6C41-5D6R-86G5-0BFR4B3625FD"}' > /etc/rhsm/facts/virt_uuid.facts

Confirm if all was set correctly with:

# subscription-manager facts | grep virt.uuid

You should now have the VM mapped and should be able to subscribe it:

# subscription-manager refresh
# subscription-manager list --available

For more KB articles/solutions related to Virt-who and Virtual Datacenter (VDC) Subscriptions Issues, please refer to the Consolidated Troubleshooting Article for Virt-who and Virtual Datacenter (VDC) Subscriptions Issues

Root Cause

The virt-who mapping fails because the uuid of the VM is not set:

# dmidecode| egrep -i uuid | tr '[:upper:]' '[:lower:]'

uuid: not settable

There is a This content is not included.bugzilla open for this issue

Diagnostic Steps

Verify the uuid for the VM on hyper-v:

# dmidecode| egrep -i uuid | tr '[:upper:]' '[:lower:]'

uuid: not settable

Verify the virt.uuid fact for subscription-manager facts:

# subscription-manager facts:

...
virt.host_type: hyperv
virt.is_guest: True
virt.uuid: Not Settable

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