Keyboard and mouse don't work after kexec

Question

While installing Fedora on my MacBook Pro Mid 2012 I've occasionally used kexec command to "boot" from live environment to the installed system.

# yum install kexec-tools.x86_64
# mount LABEL=/boot /mnt
# kexec --append 'root=UUID=... rw' \
        --initrd /mnt/initramfs-3.11.10-301.fc20.x86_64.img \
        /mnt/vmlinuz-3.11.10-301.fc20.x86_64

This worked, but I had to connect USB keyboard and mouse because the the integrated ones suddenly stopped working. I've never used kexec before, so I'd like to know if this is "by design" or just a bug? Or may be somebody know how to work this around? I suspect it was caused by non-hotpluggable PS/2 bus, if so, is there a way to properly reinitialize it?