[systemd-devel] [PATCH] systemd-detect-s390-virt: add virtualization detection on s390x

[Thomas Blume]

On Mon, 7 Jul 2014, Lennart Poettering wrote:

>> For the test, e.g. ConditionVirtualization, there would be no difference.
>> I only distinguished this in order to have systemd-detect-virt showing the
>> correct virtualization technology.
>> Sure we could cover everything under something like, e.g. "s390 virtualization".
>> But I thought it is smarter to give this little additional information.
>> Maybe there are some cases where someone needs to know in more detail which
>> virtualization is running.
>
> Again, what precisely is the difference between the two virtualizations you
> wanted to distinguish?

IMHO the main difference is the level of maturity.
z/VM is about 30 years old and has a huge amount of tools for everything you
could imagine. KVM is relatively new and under heavy development.
Furthermore, KVM is bound to the linux kernel, while z/VM is not.
Finally, KVM could theoretically run inside z/VM (thought it doesn't make sense
running KVM on an already virtualized CPU) but not vice-versa.

Kay, my colleague Ihno told me that you were working in the s390 department at SUSE.
Any opinion about the use of distinguishing z/VM from KVM under s390?


Regards
Thomas