Apr 4, 2009 02:10:23 PM, ivo...@freebsd.org wrote:
   >Can someo= ne please review and commit (if appropriate) the tweak for
   >Hyper-V shu= tdown issue at
   http://shell.peach.ne.jp/aoyama/archives/40
   >?
   >
   = >>The problem is: the VM appears to hang on shutdown without it
   (hanging
   >the Hyper-V VM with it so the host also can't shutdown or reboot
   >re= liably - someone at MS skipped the part where an error in the VM
   >isn't= supposed to bring the host down with it)
   I don't have the commit = permission any more but I can review :-)
   Yes, Hyper-V does not like th= e writes into the PCI config space.
   Very specifically,
   writing the base= register window address of the simulated 21140
   screws up something
   tha= t prevents the VM from shutting down. Interestingly, even reading
   and writi= ng
   back the same value has this effect. So the patch is valid.
   = >I don't particularly like the hackish checking for the 21140 chip,
   and I'= m not sure
   if if would break some real 21140 chip out there. If the dri= ver does
   the same as another
   one I've seen, the driver tries to align t= he register window to
   0x80, and in the
   simulated 21140 it's already ali= gned. I've had a quick look but
   couldn't say it
   for sure. I'd do it dif= ferently: check if the value being written is
   the same that was read,
   = and skip the write in this case.
   Let me see, maybe I'll make a dif= ferent patch.
   -SB
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