Description of problem:
The PV framebuffer doesn't work on shadow translate mode, because it doesn't
translate gpfn to mfn. Upstream doesn't need that translation, because the
hypervisor accepts gpfns in 3.0.4.
Steps to Reproduce:
1. Make sure pvfb is enabled (it is by default)
2. Start the pv domain, e.g. with xm create DOMNAME
pvfb backend daemon dies during startup.
pvfb backend process runs.
/local/domain/0/backend/vfb/2/0 on fire (Invalid argument)
/local/domain/0/backend/vkbd/2/0 on fire (Invalid argument)
*** This bug has been marked as a duplicate of 216169 ***