will downgrade fedora kernel break libvirt features ?

[thibaut noah]

Hello, i use fedora 23 with kernel 4.2.5 to run a win10 vm using qemu/kvm
with vga passthrough (vfio).
I purchased a raid pci card, the problem is got is the compatibility for
the driver stop at kernel 4.0.4
Is it possible to downgrade the kernel to install the driver?
If i do will i still be able to run my virtual machine without changing
everything?