- Esx Problem Hyperthreading Unmitigated Configuration Issues
- Esx.problem.hyperthreading.unmitigated Configuration Issue
After installing VMware patches you might see a warning:
XXX esx.problem.hyperthreading.unmitigated.formatonhost not found XXX
Those patches which are addressed in VMware Security Advisory VMSA-2018-0020 migitate a vulnerability named L1TF. Tf2 best rocket launcher skins. Because the patch will result in a performance impact, it is not activated by default. Administrators need to decide what is their main focus: performance or security.
I applied the most recent set of patches to one of my vSphere hosts last night (SuperMicro SYS-5028D-TN4T) and in the vSphere client this morning I'm seeing a Configuration Issues popup: XXX esx.problem.hyperthreading.unmitigat ed.formatO nHost not found XXX. Using this configuration, ESXi would automatically generate and present the optimal vNUMA topology to the virtual machine. However, this suggestion has a few shortcomings. Since the vCPUs are presented as Sockets alone, licensing models for Microsoft operating systems and applications were potentially limited by the number of sockets.
Suppress warning
Esx.problem.hyperthreading.unmitigated Cause The ESXi patches available in VMSA-2018-0020 to mitigate CVE-2018-3646 introduced a new notification to indicate the remediation status of the 'L1 Terminal Fault' (L1TF - VMM) vulnerability. VCenter Server, ESXi, Workstation, and Fusion updates include Hypervisor-Specific Mitigations for L1 Terminal Fault - VMM. This issue may allow a malicious VM running on a given CPU core to effectively read the hypervisor’s or another VM’s privileged information that resides sequentially or concurrently in the same core’s L1 Data cache. However, this time it did not go away and as you can see from the screenshot, I have had my ESXi host up for 4 days now and the message is still there. UPDATE (9/30) - This looks to be a known issue in vSphere 5.5 and there is a permanent fix which has been documented in the following VMware KB 2061008. Restarting the management service will.
If one decides to have more performance and neglects the potential threat, then it is possible to suppress the warning. Just set advanced option UserVars.SuppressHyperthreadWarning from 0 to 1 and the warning will disappear. This should only be done after reviewing KB 55806.
Activate migitation
Connect to the vCenter Server using either the vSphere Web or vSphere Client. Switch to “Hosts and Clusters” view and select an ESXi host in your inventory.
Select an ESXi host in the inventory.
Select an ESXi host in the inventory.
Click the Manage (5.5/6.0) or Configure (6.5/6.7) tab and then switch to “Settings”.
Move to System > Advanced System Settings and enter in the filterbox: VMkernel.Boot.hyperthreadingMitigation.
Select the setting and click the Edit pencil icon. Change the default value (false) to true and click OK.
In order to take effect, the host needs to reboot.
Esx Problem Hyperthreading Unmitigated Configuration Issues
PowerCLI
![Unmitigated Unmitigated](https://s4.51cto.com/images/blog/201812/28/9545edee0343c91362638dbaf5d20c34.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)
Using PowerCLI is recommended if you have more than one host.
![Esx Esx](/uploads/1/1/1/8/111834519/399275028.jpeg)
Check current values.
Set values
The next command will activate the migitation on all hosts without confirmation (be careful!).
In order to take effect, the host needs to reboot.
Links
Gallery vault pro key free. VMware KB 57374 – L1TF related “esx.problem.hyperthreading.unmitigated” vCenter Server Updates
VMware KB 55806 – L1 Terminal Fault – VMM
Esx.problem.hyperthreading.unmitigated Configuration Issue
The vSphere HA agent on a host is in the Uninitialization Error state. User intervention is required to resolve this situation.
vSphere HA reports that an agent is in the Uninitialization Error state when vCenter Server is unable to unconfigure the agent on the host during the Unconfigure HA task. An agent left in this state can interfere with the operation of the cluster. For example, the agent on the host might elect itself as primary host and lock a datastore. Locking a datastore prevents the valid cluster primary host from managing the virtual machines with configuration files on that datastore.
Cause
This condition usually indicates that vCenter Server lost the connection to the host while the agent was being unconfigured.
Add the host back to vCenter Server (version 5.0 or later). Office tab 13. The host can be added as a stand-alone host or added to any cluster.