[PATCH] PV Passthrough PCI Device Hotplug Support (Tools Part)

[Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>]

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Hi,

This is the updated patch of PV PCI passthrough hotplug (tools portion).

Changes to xm command:
- Let 'xm pci-attach' command use <domain:bus:slot.func> expression
   rather than use separated arguments like <domain> <bus> <slot> <func>.
   This is the same expression of the domain configuration file and I
   believe it is more user-friendly.
- Let 'xm pci-detach' command use the same <domain:bus:slot.func>
   expression. Formerly, <virtual slot> was used as the key to indicate
   which device we were detaching. But for the current implementation of
   PV PCI hotplug, virtual slots don't have much meaning. I think using
   the same physical device name in both attachment and detachment is
   appropriate here.

Changes to xend:
- Both attach and detach commands are received by device_configure()
   and handled by pci_device_configure().
- HVM specific processings are done in hvm_pci_create_device() and
   hvm_destroyPCIDevice().

The major problem I encoutered during this work is that, I don't have
a vt-d enabled machine and could not confirm that HVM PCI hotplug would
still work after modifications :-(
Then I hacked libxc a little to pretend as if there existed a vt-d
hardware, and could see HVM PCI attach/detach working correctly.
So now I'm pretty sure that we can do both PV and HVM hotplugs with
this patch, but I would appreciate it if someone could test this on
a real vt-d machine.

Regards,
-------------------
Yosuke Iwamatsu
         NEC Corporation


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