Re: [Qemu-devel] [PATCH RESEND v2 0/3] pc: Set hw_version on all machine classes

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 10, 2015 at 04:01:51PM +0100, Paolo Bonzini wrote:
> 
> 
> On 09/11/2015 21:46, Michael S. Tsirkin wrote:
> > On Mon, Nov 02, 2015 at 12:55:07PM +0100, Paolo Bonzini wrote:
> >> On 30/10/2015 20:36, Eduardo Habkost wrote:
> >>> In 2012, QEMU had a bug where it exposed QEMU version information
> >>> to the guest, meaning a QEMU upgrade would expose different
> >>> hardware to the guest OS even if the same machine-type is being
> >>> used.
> >>>
> >>> The bug was fixed by commit 93bfef4c6e4b23caea9d51e1099d06433d8835a4,
> >>> on all machines up to pc-1.0. But we kept introducing the same
> >>> bug on all newer machines since then. That means we are breaking
> >>> guest ABI every time QEMU was upgraded.
> >>>
> >>> Fix this by setting the hw_version on all PC machines, making
> >>> sure the hardware won't change when upgrading QEMU.
> >>>
> >>> Eduardo Habkost (3):
> >>>   pc: Set hw_version on all machine classes
> >>>   osdep: Rename qemu_{get,set}_version() to qemu_{,set_}hw_version()
> >>>   megasas: Use qemu_hw_version() instead of QEMU_VERSION
> >>>
> >>>  hw/arm/nseries.c     |  2 +-
> >>>  hw/i386/pc_piix.c    | 13 +++++++++++++
> >>>  hw/i386/pc_q35.c     | 10 ++++++++++
> >>>  hw/ide/core.c        |  2 +-
> >>>  hw/scsi/megasas.c    |  2 +-
> >>>  hw/scsi/scsi-bus.c   |  2 +-
> >>>  hw/scsi/scsi-disk.c  |  2 +-
> >>>  include/qemu/osdep.h |  4 ++--
> >>>  target-i386/cpu.c    |  2 +-
> >>>  util/osdep.c         | 10 +++++-----
> >>>  vl.c                 |  2 +-
> >>>  11 files changed, 37 insertions(+), 14 deletions(-)
> >>>
> >>
> >> Michael, is it okay for you if I merge this patch series?
> > 
> > Sorry about missing this the 1st time around.
> > Let's discuss the right thing to do here -
> > it's a bugfix so we can merge it after hard freeze.
> 
> It's already in...
> 
> Paolo

How about a patch that just drops QEMU_VERSION from there?

-- 
MST