Hi,
It has not been a positive experience for me so far trying to get the installation running in VirtualBox using Intel Core 2 Duo (P8700) or Intel Xeon Quad Core (X5482) CPUs. When booting the ISO disk image with default options, the startup process stops at showing "Starting Switch Boot...". It continues after pressing Ctrl-c, or letting it timeout for 2 - 3 minutes but it's slow. I canceled the installation after 45 min, which took less than 10 minutes on another system running on Intel "Core i5" (3210M).
At first I thought it might be a VirtualBox problem, trying 5.1.38, 5.2.28, and finally 6.0.6 with its awkward and cheap new interface. After trying several options to troubleshoot the problem as shown below, I finally figured that it works after disabling "IOAPIC" in the VM settings. This way, there is no more need for timeouts, but performance continues to be slow. If I'm not mistaken, then lack of IOAPIC may result in software emulation. I had better results using VMware Fusion, however, if the problem is indeed CPU/Chipset support, it's just pointless.
I guess this means that RHEL/OL 8 or the 4.18 Red Hat kernel has further reduced CPU/Chipset support. Perhaps hardware prior to 2012 isn't supported anymore. I don't know the rationale behind it, but perhaps there is a chance for the Oracle UEK kernel to do better.
Below are some of my attempts and results, just for the record.
Hanging at the startup screen:
Booting in verbose mode ( pressing the tab key to remove quiet from kernel command line)
Adding "nomodeset" makes no difference.
Adding "ingore_loglevel"
Adding "selinux=0"
Adding "ipv6.disable=1"
After a timeout, the Anaconda GUI finally appears, but the installation will be slow.
Thanks!