Hello, friend!
FusionCompute 6.1 can be upgraded to FusionCompute 8.0.1. Although FusionCompute 8.0.1 uses the KVM architecture and FusionCompute 6.1 uses the Xen architecture, Huawei has FusionCompute RCS for upgrading the Xen architecture to the KVM architecture.
Question 1:
The latest version of the FusionCompute Xen architecture is 6.1.
Question 2:
FusionCompute 6.1 can be upgraded to FusionCompute 8.0.1. However, you cannot directly upgrade FusionCompute 6.1 to FusionCompute 6.3 and then to FusionCompute 8.0.
Hope this helps!