Details:
VMware Workstation 9.0.2 Build 1031769
XenServer 6.0.2 Build 53456p VM
Windows XP SP3 nested VM within XenServer VM
All this works just fine... a bit slow yes, but it works fine UNTIL I install the XenServer tools.
Once I do that when the WinXP VM boots and loads up to mup.sys it crashes and so does the XenSever VM with the following VMware Workstation error within vmware.log:
vcpu-0| I120: [msg.log.error.unrecoverable] VMware Workstation unrecoverable error: (vcpu-0)
vcpu-0| I120+ vcpu-0:VM-entry failed; VMCS valid (error code 7)
Any ideas which driver XenServer tools is installing that is causing this???