[libvirt] [Qemu-devel] [PATCH RESEND] qdev: Make "hotplugged" property read-only

[Eduardo Habkost]

On Mon, Feb 27, 2017 at 07:05:24PM +0100, Markus Armbruster wrote:
> Eduardo Habkost <ehabkost at redhat.com> writes:
> 
> > The "hotplugged" property is user visible, but it was never meant
> > to be set by the user. There are probably multiple ways to break
> > or crash device code by overriding the property. For example, we
> > recently fixed a crash in rtc_set_memory() related to the
> > property (commit 26ef65beab852caf2b1ef4976e3473f2d525164d).
> >
> > There has been some discussion about making management software
> > use "hotplugged=on" on migration, to indicate devices that were
> > hotplugged in the migration source. There were other suggestions
> > to address this, like including the "hotplugged" field in the
> > migration stream instead of requiring it to be set propertly.
> >
> > Whatever solution we choose in the future, this patch disables
> > setting "hotplugged" explicitly in the command-line by now,
> > because the ability to set the property is unused, untested, and
> > undocumented.
> >
> > Signed-off-by: Eduardo Habkost <ehabkost at redhat.com>
> 
> I figure this is the safe thing to do for 2.9.
> 
> Reviewed-by: Markus Armbruster <armbru at redhat.com>

Thanks. I have merged it to my "machine" branch, and I plan to
include it in a pull request next week.

-- 
Eduardo