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Re: [Qemu-devel] [PATCH V15 4/5] i386: add a Virtual Machine Generation


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH V15 4/5] i386: add a Virtual Machine Generation ID device
Date: Mon, 08 Jun 2015 15:55:14 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0


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



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