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"? Paolo
