On Mon, Jun 08, 2015 at 03:55:14PM +0200, Paolo Bonzini wrote: > > > On 08/06/2015 15:52, Gal Hammer wrote: > >>> 2. Is it possible to create a sysbus device using the "-device" command > >>> line argument? I vaguely recall that it is not possible to do it and > >>> that's the reason that I specifically add the device in the pc init. > >> > >> It's now possible, but it is somewhat complicated. I think it's simpler > >> to initialize this unconditionally and hide it (via ACPI _STA) if the > >> vmgenid is all zeros. > > > > I didn't understand. I need the device to be a sysbus device so it won't > > be found as an ISA or a PCI device by Windows. So I need to know what > > ever or not it is possible to create a sysbus device using "-device". In > > either way it won't be created if vmgenid is not given so no need to > > hide it using _STA. > > Windows doesn't enumerate ISA devices when you create them with -device. > It just enumerates devices from the ACPI DSDT/SSDT. So it's okay to > make it an ISADevice, or to make it a part of another device (e.g. the > ISA bridge or the power management device). It's still ugly though. > > If you make it a sysbus device, you can just add it unconditionally, and > define _STA so that Windows only sees it under the appropriate > circumstances: for example, return 0 from _STA if the vmgenid (from the > command line) is all zeroes. > > What is the command line option like? Is it "-global vmgenid.uuid=foo"?
FWIW, although the spec for this feature comes from Windows/Microsoft, I'd expect that when we enable it in libvirt, we'll want to make it unconditionally available to all VMs, since its a generically useful information source for guest OS'. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
