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Re: Upgrading the host

On 2/17/2021 12:23 AM, Michal Privoznik wrote:
On 2/17/21 2:45 AM, Marcin Struzak wrote:
On 2/16/2021 12:51 AM, Michal Privoznik wrote:
On 2/12/21 2:10 AM, Marcin Struzak wrote:

 3. Anything else I should worry about or prepare ahead?

Not strictly related to libvirt, but machine types might be problem. I guess qemu will be upgraded too and in general the machine type you're using for a domain might not be available in upgraded qemu.
Correct, it looks like qemu will go from 1.6.2 to 4.2.1...

You can view supported machine types by running 'virsh capabilities' with upgraded qemu.
machine is pc-i440fx-1.6 in all my domains.  Is there a simple way to figure out if that's supported in libvirt 6.1.0 (without installing it)?

It's not libvirt who has say in machine types. Libvirt treats machine type as an opaque string. But I can see that pc-i440fx-1.6 is still available even with the latest QEMU release:

# /usr/bin/qemu-system-x86_64 -version
QEMU emulator version 5.2.0

# virsh capabilities | grep pc-i440fx-1.6
      <machine maxCpus='255'>pc-i440fx-1.6</machine>
      <machine maxCpus='255'>pc-i440fx-1.6</machine>

So you are safe on that front.

Excellent, thank you for checking.

Out of curiosity: what would have been my course of action if that particular machine were no longer defined?  I assume: substitute with a close match (after figuring out how do determine what counts as "close") & hope that the VMs (all Fedoras & Ubuntus) cope & adjust?


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