[libvirt] [Qemu-devel] [PULL 25/26] block: Remove deprecated -drive option serial

[Daniel P. Berrangé]

On Mon, Jun 25, 2018 at 10:23:03AM +0200, Thomas Huth wrote:
> On 25.06.2018 09:16, Peter Krempa wrote:
> > On Fri, Jun 22, 2018 at 14:55:02 +0200, Kevin Wolf wrote:
> >> Am 22.06.2018 um 13:38 hat Christian Borntraeger geschrieben:
> >>>
> >>> On 06/15/2018 04:21 PM, Kevin Wolf wrote:
> >>>> The -drive option serial was deprecated in QEMU 2.10. It's time to
> >>>> remove it.
> >>>>
> >>>> Tests need to be updated to set the serial number with -global instead
> >>>> of using the -drive option.
> [...]
> >>> So it seems that this breaks s390x.
> >>
> >> Thanks for bringing this up. libvirt should fix this before QEMU 3.0 is
> >> released.
> > 
> > So, I already extracted the code that formats the attributes which
> > should be actually done for the frontend few months ago, but did not
> > swithc to it since I did not want to check when everything was added.
> > 
> > The fix will be rather simple if we are certain that the disk serial,
> > geometry and error policies were supported in qemu 1.5. In that case we
> > can switch unconditionally to the new format.
> 
> The CHS device properties are available since QEMU v1.2:
> - IDE: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=ba801960
> - SCSI: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=d252df48
> - virtio-blk: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=e63e7fde2
> 
> The "serial" property and the PCI "addr" property are also available
> since 2012 at least, I didn't fully track their origins, but QEMU v1.2
> already supported them.
> 
> So yes, all these properties should be available in QEMU 1.5 already.

The werror/rerror attributes were not added until 2.7.0, so we still
need a capabilities check for them

Regards,
Daniel
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