> > > It is, because pkgsrc softwares are expected to build and run on older
> > > systems.
> > 
> > do you mean, we need to keep xentools in pkgsrc to use old version of
> > IOCTL_PRIVCMD_INITDOMAIN_EVTCHN?

can you please answer this question?
i want to change pkgsrc to use new version of the ioctl eventually.
isn't it acceptable for you?

> > > > > The upgrade path for the /kern mmap issue is:
> > > > > update pkgsrc and rebuild xentools20
> > > > > update kernel
> > > > > reboot
> > > > > if something goes wrong with the new kenrel you can still go back to the
> > > > > old one.
> > > > 
> > > > you can go back to the old xentools, can't you?
> > > 
> > > Once you have updated pkgsrc and installed the new tools, it's not as easy
> > > as rebooting on an older kernel.
> > 
> > i think you can boot domain0 with old kernel and install old xentools.
> 
> Which means that you have to revert the pkgsrc source. not easy if you
> don't have CVS access.

well, so what?
all userland tools are the same in these respects.

YAMAMOTO Takashi