> https://www.linux-kvm.org/page/Nested_Guests

the page is sadly outdated

there are efforts in kernel and qemu to enable real working live migration of nested machines.

currently qemu decided to disable migration altogether when nesting is enabled and the guest has the vmx/svm flag.[0]

you can try with a cpu model that does not include that flag, but
you lose nesting for that machine ofc.

kind regards
Dominik

0: https://github.com/qemu/qemu/commit/d98f26073bebddcd3da0ba1b86c3a34e840c0fb8

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