QEMU system emulators immediately crash on AMD hosts when KVM is used
Description of problem:
```
$ qemu-system-x86_64  -accel kvm
qemu-system-x86_64: ../target/i386/kvm/kvm-cpu.c:105: kvm_cpu_xsave_init: Assertion `esa->size == eax' failed.
Aborted (core dumped)
```

This is a regression introduced in

https://lists.gnu.org/archive/html/qemu-devel/2022-03/msg04312.html