Re: [Qemu-devel] [PATCH v3 1/5] virtio: add "use-started" property

[Greg Kurz <groug@kaod.org>]

On Mon, 17 Jun 2019 10:14:30 +0800
Yongji Xie <elohimes@gmail.com> wrote:

> On Fri, 14 Jun 2019 at 19:45, Greg Kurz <groug@kaod.org> wrote:
> >
> > On Fri, 14 Jun 2019 17:31:17 +0800
> > elohimes@gmail.com wrote:
> >  
> > > From: Xie Yongji <xieyongji@baidu.com>
> > >
> > > In order to avoid migration issues, we introduce a "use-started"
> > > property to the base virtio device to indicate whether use
> > > "started" flag or not. This property will be true by default and
> > > set to false when machine type <= 4.0.1.
> > >
> > > Suggested-by: Greg Kurz <groug@kaod.org>
> > > Signed-off-by: Xie Yongji <xieyongji@baidu.com>
> > > ---
> > >  hw/block/vhost-user-blk.c  |  4 ++--
> > >  hw/core/machine.c          |  8 ++++++--  
> >
> > This patch conflicts with latest upstream changes to hw_compat_4_0_1[].
> >
> > It seems you need to rebase. Also, I'm still not sure how we're supposed
> > to handle hw_compat_4_0_1[] versus hw_compat_4_0[]... nobody commented
> > on:
> >
> > https://lists.gnu.org/archive/html/qemu-devel/2019-06/msg00637.html
> > https://lists.gnu.org/archive/html/qemu-devel/2019-06/msg00641.html
> >
> > Maybe worth to sort that out before re-posting.
> >  
> 
> If hw_compat_4_0_1[] is introduced only for q35, I think this patch
> should be OK. If not, maybe we should handle hw_compat_4_0_1[] in
> other machine types (i440fx, arm, ppc, s390)?
> 

It turns out that hw_compat_4_0_1[] isn't needed at all. Please see:

https://lists.gnu.org/archive/html/qemu-devel/2019-06/msg03054.html

> Hi Alex and Paolo,
> 
> Any comment for this?
> 
> Thanks,
> Yongji