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Date: Sun, 14 Sep 2014 15:40:45 +0200
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Subject: Re: [Qemu-devel] [PATCH RESEND 0/2 V2] Virtual Machine Generation ID
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To: Gal Hammer <ghammer@redhat.com>, qemu-devel@nongnu.org
Cc: armbru@redhat.com

Il 14/09/2014 12:51, Gal Hammer ha scritto:
>>
>> I think because of this, it is a bit simpler to add the device
>> optionally to the SSDT, similar to how the TPM is handled.
> 
> Back to SSDT? Didn't you say something about migration issues that
> prevent me from using SSDT because the table's data is modified?

I said you have to either:

1) Use the DSDT, with a dynamic _STA method.

2) Use the SSDT, and only add the device if the device is specified on
the command line.  This avoids the avoid migration issues.  At this
point the _STA method can be static.

Using the DSDT is possible, it's just that you have to do it as well for
Q35, and I think it is harder than moving it back to the SSDT.  Sorry
for not thinking earlier about the different chipsets.

Paolo