[ovirt-users] Re: Unable to enable HPET component of an specific VM in oVirt 4.7

[ricardoot]

Hello again.
I insist again on this topic since I have not yet managed to activate the HPET 
on the VM. I have searched the VDSM Hook documentation 
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.4/html/administration_guide/vdsm_hooks_examples
but I don't see anything related to modify HPET clock.
I have seen that the hardware BIOS has HPET and it is active. On the 
virtualization host I can see it's available


Please, somebody could help me?
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[ovirt-users] Re: Unable to enable HPET component of an specific VM in oVirt 4.7

[Volenbovskyi, Konstantin]

Hi,
I don't think that anyone should modify database of ovengine and especially in 
cases like that.
As I said, try to do something with VDSM hooks
(but I personally won't be able to reply on questions related to that 
functionality)

BR,
Konstantin

Am 02.06.23, 14:43 schrieb "ricard...@gmail.com " 
mailto:ricard...@gmail.com>>:


Thanks for the quick reply,
True, I got confused, the version I wanted to say is 4.4.7
Could you give me some idea of how to access and modify the database? this is 
something new for me.
I have tried this on Engine but I am very lost.
[root@ovirt ~]# su - postgres
[postgres@ovirt ~]$ psql
[postgres=# select hpet from vm_static where vm_name='VM_NAME';
ERROR: relation "vm_static" does not exist
LINE 1: select hpet from vm_static where vm_name='VM_NAME';


Thank you very much again.
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[ovirt-users] Re: Unable to enable HPET component of an specific VM in oVirt 4.7

[ricardoot]

Thanks for the quick reply,
True, I got confused, the version I wanted to say is 4.4.7
Could you give me some idea of how to access and modify the database? this is 
something new for me.
I have tried this on Engine but I am very lost.
[root@ovirt ~]# su - postgres
[postgres@ovirt ~]$ psql
[postgres=# select hpet from vm_static where vm_name='VM_NAME';
ERROR:  relation "vm_static" does not exist
LINE 1: select hpet from vm_static where vm_name='VM_NAME';

Thank you very much again.
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[ovirt-users] Re: Unable to enable HPET component of an specific VM in oVirt 4.7

[Volenbovskyi, Konstantin]

Hi,
there is no ovirt 4.7, the latest (and it could be the last ☹) version of ovirt 
is 4.5. Probably you mean 4.4.7?
Probably enabling HPET is not needed so often, so I guess it is just a missing 
feature of ovirt.

Anyway, replying on your question - it is wrong to modify Libvirt XML, the 
source of truth is pretty much database in ovengine.
You might consider VDSM hook:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.4/html/administration_guide/appe-vdsm_and_hooks
(but I don't know a lot about VDSM hooks myself)

BR,
Konstantin


Am 02.06.23, 07:35 schrieb "ricard...@gmail.com " 
mailto:ricard...@gmail.com>>:


Hello community members,


I'm currently using oVirt 4.7 as my virtualization environment, and I'm facing 
an issue with enabling the HPET (High Precision Event Timer) component in the 
XML configuration file of virtual machine (VM).


Upon inspecting the XML file, I noticed that the `` line is missing, indicating that the HPET component is disabled.


Here are the steps I have taken so far:


1. I verified that the VM's XML configuration file does not include the `` line.


2. While the VM was powered on, I used the following command to edit the XML 
configuration file:
```
virsh edit VM_NAME
```
I added the `` line to the XML file. However, 
the changes did not persist after restarting the VM.


To provide additional information, on the host where oVirt is running, the 
available clock sources can be viewed by executing the following command:
```
cat /sys/devices/system/clocksource/clocksource0/available_clocksource
```
The output shows the available clock sources, such as `tsc`, `hpet`, and 
`acpi_pm`.


To resolve the authentication issue with the `virsh` command, I created a user 
with appropriate privileges using the following command:
```
sudo saslpasswd2 -a libvirt USERNAME
```
After creating the user, I was able to authenticate successfully with the 
`virsh` command using the newly created credentials.


However, I'm unable to find an option to add the HPET parameter in the web 
console of oVirt. It seems that the option to configure HPET is not available 
in the web console.


Has anyone else encountered a similar issue in oVirt 4.7? Could you please 
provide guidance or suggest a solution to enable the HPET component in the XML 
configuration file of a powered-off VM in oVirt 4.7? Any insights, experiences, 
or suggestions would be greatly appreciated.


Thank you in advance for your assistance!


Best regards,
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