Open Stack

On Tue, 2023-09-19 at 14:03 +0200, pi3.14 at tuta.io wrote:
> Hello,
> 
> Is it possible to use virtual hardware watchdog in Windows VMs?
> I am emulating the "i6300esb" with QEMU in Linux instances and 
> everything works as expected. But when creating Windows 
> instances, this device does not show up in the device manager.

so upstream does not generally provide any support for workload runing on openstakc
inclduing the os. the watchdog device model is not currently expsoted as a tunable
via a flavor or image property so configurign it is not currently supprot by nova.
it is hardcoded to i6300esb so if your windows guest does not have the correct dirver
then it wont work.
https://github.com/openstack/nova/blob/master/nova/virt/libvirt/config.py#L2458

it looks like libvirt does supprot other models
https://libvirt.org/formatdomain.html#watchdog-devices

and 'itco'is included by default with q35 machine type Since 9.1.0

but its still not clear if windows would even supprot that if we were to make this configurable

you could try setting the machine type to q35 see if that works for you

"""
Having multiple watchdogs is usually not something very common, but be aware that this might happen, for example, when
an implicit watchdog device is added as part of another device. For example the iTCO watchdog being part of the ich9
southbridge, which is used with the q35 machine type. Since 9.1.0
"""
im not sure if the watchdog action would affect the implict iTCO watchdog or not
the default is 'reset' - default, forcefully reset the guest

> 
> - Has anyone tried/tested this before? 
this is not test upstream or downstream
we have no windows guest testing upstream and this
is not an offically supported fature in redhats downstream although it
not offically unsupproted meaning you can use it if it works for your use case
but we do not test it with any sepecic os.
> - Is this supported?
offically we support exposing a watchdog device to a guest but that is where our supprot
ends. upstream nova does not provide support for the integration fo a watchdong in any given os.
> - Are additional drivers needed?
this is likely the issue you are encountering
windows is proably misssing the i6300esb driver
> - I found the following old bug. Has anything changed since then or
> are there still no suitable drivers?
> https://bugzilla.redhat.com/show_bug.cgi?id=610063
> 
quickly googleing i dont see refence to one so i woudl assume tha tis still the case