I have noticed the below error when one day i was starting up my KVM virtual machines to play around with Docker Swarm.
error: internal error: process exited while connecting to monitor: qemu: could not load PC BIOS 'bios-256k.bin'
There wasn't much information on google or forums and most talked about symlinks that weren't there. Most folks recommended reinstalling seabios and seabios-bin. But unfortunately, reinstalling these packages did not provide the necessary files.
Upon further inspection of the package versions, I noticed that
seabios-1.8.2-1.el7 does not provide
seabios-bin-1.7.5-11.el7 does provide that file.
Make sure that you are installing
seabios-bin-1.7.5-11.el7. Check that you do not have
/etc/yum.repos.d/CentOS-Xen.repo enabled. These packages should be
pulled from http://mirror.centos.org/centos/7/virt/x86_64.