Ok, in your log we see

error: kvm run failed Invalid argument
EAX=b0008004 EBX=7ffaa3b0 ECX=00000004 EDX=b0000004
ESI=7ffa9c70 EDI=000f246a EBP=000f244b ESP=00006cec
EIP=000eb4ae EFL=00010082 [--S----] CPL=0 II=0 A20=1 SMM=0 HLT=0
...

That is why your guests fail.

I was preparing a UEFI and a Bios guest on hirsute.

Working fine so far, then I upgraded all packages.

Working fine still
FYI - kernel was on 5.8.0-29-generic

Then I upgraded to 5.10.6-051006 from the mainline ppa.
(https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10.6/)


Guests still working fine :-/

@Kernel Team do you know about any changes coming?

** Changed in: libvirt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1909495

Title:
  Unable to start BIOS VMs since Linux 5.10

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