Perhaps they should switch to BitCoin."
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Look for that to change. Red Hat told us a year ago that Xen was dead and being phased out. If Oracle wishes to continue to use RHEL code with tweaks they will be moving to KVM. I doubt they want to go through the bother of messing with Xen if it's removed in RHEL.
Oracle has had their own independent Xen implementation that they ship as Oracle VM.
And Sun's Xen uses Solaris as the dom0.
No Red Hat Xen.
Real computer scientists don't program in assembler. They don't write in anything less portable than a number two pencil.