"Oracle has not certified any Oracle software on VMware virtualized environments," the company said in a statement. Thus, "Oracle support will assist customers running Oracle software on VMware in the following manner: Oracle will only provide support for issues that either are known to occur on the native OS without virtualization, or can be demonstrated not to be as a result of running VMware. If a problem is a known Oracle issue, Oracle support will recommend the appropriate solution on the native OS without virtualization. If that solution does not work in the VMware virtualized environment, the customer will be referred to VMware for support."
In other words, customers can expect Oracle's help only if they can prove that a bug is totally unrelated to the virtualization platform they are using.