Don’t know if I mis-installed something, but trying to create a 64 bit HVM causes a libvirt error when using Virtual Manager to create a new VM. Namely that the device module “/usr/lib64/xen/bin/qemu-dm” isn’t found. But, qemu-dm exists in “/usr/lib/xen/bin”. So a cp /usr/lib/xen/bin/* /usr/lib64/xen/bin/ later, my OpenIndiana system boots, albeit running as 32bit, not 64bit.
But where I’m only giving it 2GB of RAM, not too significant.