Re: [Xen-devel] [PATCH 5/6] libxl: add libxl_vm_generation_id_set()

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 28/05/14 15:56, Ian Campbell wrote:
> On Tue, 2014-05-27 at 18:31 +0100, David Vrabel wrote:
>> Add a function to allow a toolstack to set a domain's VM generation
>> ID.
>>
>> Although the specification requires that a ACPI Notify event is raised
>> if the generation ID is changed, in practice this appears not to be
>> necessary if the generation ID is changed while the Windows VM is
>> suspended.
> 
> Do we (or did Microsoft) envisage scenarios where the ID might change
> while the VM was not suspended?

I think the specification has been written to allow for this.  But when
running on Xen I would not anticipate this being necessary.

>> +    /*
>> +     * Update the ID in guest memory (if available).
> 
> Does "if available" here translate to "on restore"? (with on create
> being handled by hvmloader, IOW this is the cooperation I was wondering
> about on the docs patch)

Yes.

David

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