Re: [Qemu-devel] cross version compatibility and qemu version

["Andreas Färber" <afaerber@suse.de>]

Am 04.08.2013 12:25, schrieb Peter Maydell:
> On 4 August 2013 11:20, Michael S. Tsirkin <mst@redhat.com> wrote:
>> I was looking at cross-version migration issues, in the
>> hope that we can fix most of them for release 1.6.
>> I noticed that we still use QEMU_VERSION in hardware.
> 
> We fixed most of these back in 2012, but I guess one or
> two slipped through the net.
> 
>> hw/scsi/megasas.c:    snprintf(info.package_version, 0x60, "%s-QEMU", QEMU_VERSION);
>> hw/usb/redirect.c:#define VERSION "qemu usb-redir guest " QEMU_VERSION
>>
>> These look like a bug that will break cross version
>> compatibility - I think need to change both instances
>> to qemu_get_version()?
[...]
>> megasas also includes the build date/time of QEMU - this
>> clearly removed any hope to be exactly compatible.
>> I'm not sure what to do with respect to this:
>> let's stop the clock at an arbitrary date?
>> Add property for management to control this as well?
> 
> I would go for using an arbitrary (and preferably
> obviously wrong) date, or just dropping the fields
> altogether if the hardware format permits (it probably
> doesn't).

Let's simply CC Hannes and ask him. :)

Andreas

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