> On 27 Jan 2020, at 22:01, Gianluca Cecchi <gianluca.cec...@gmail.com> wrote:
> 
> Hello,
> in oVirt 4.3.7 in "Edit VM" -> System -> Advanced parameters
> I can choose 
> 
> Bios Type:
> Default
> Q35 Chipset with Legacy BIOS
> Q35 Chipset with UEFI BIOS
> Q35 Chipset with SecureBoot
> 
> and
> Custom Emulated Machine:
> Use cluster default (pc-i440fx-rhel7.6.0)
> ...
> q35
> pc-q35-rhel7.3.0
> pc-q35-rhel7.4.0
> pc-q35-rhel7.5.0
> pc-q35-rhel7.6.0
> 
> and I can apparently mix all possible values.

you can, but they won’t work:)
in 4.3 the whole q35 is tech preview, with bugs we’ve fixed in 4.4. 
custom emulated machine is really just for the cases where you can troubleshoot 
by trying a “similar enough” machine type. using a different chipset or type 
from different major version will likely just fail on vm start.

> Any deeper information about implications?
> What is the "Default" value for Bios Type?

i440fx with seabios(Legacy BIOS)

> 
> Did anything change in 4.3.8 (eg official support for q35)?

no, only in 4.4 where q35/seabios becomes the new default for new 4.4 clusters

> 
> I search also through official docs for RHV 4.3 (virtual mgmt guide, appendix 
> A), but for example I don't find any reference to the "Bios Type" parameter 
> and a vague reference to the "Custom Emulated Machine". Is there any more 
> detailed link?

there should be a bit more about bios, since it’s becoming a default, but don’t 
ahve it in front of me/at hand at the moment, sorry

Thanks,
michal

> 
> Thanks,
> Gianluca
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