Re: [Xen-devel] vnc=1 / pvgrub / close fb: backend at /local/domain/0/backend/vfb/xx/0

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Hello Steven,
thanks for testing!

Regarding the other issue, which QEMU version are you using? Which Xen
version? On Xen 4.5.0-rc1 I don't see any problems.


On Thu, 6 Nov 2014, Steven Haigh wrote:
> Hi Stefano,
> 
> It seems that this patch fixes the grub issue for me. I no longer get
> the infinite wait at the grub prompt.
> 
> On 6/11/2014 4:49 AM, Stefano Stabellini wrote:
> > Hello Steven,
> > I have found some time to debug this myself.
> > I couldn't reproduce the booting issue that you reported: in my case
> > after seeing the grub boot menu I can successfully boot the kernel
> > without problems.
> > 
> > However I can reproduce the timeout issue that you are seeing: the
> > timeout doesn't work properly in graphics mode.
> > 
> > The reason is that the with a graphics terminal you checkkey () return 0
> > even when pressing no keys, resulting in wrong behaviour in run_menu. 
> > 
> > Does the following patch (also attached) fixes your issues?
> > 
> > 
> > diff --git a/stubdom/grub.patches/11graphics-keyboard.diff 
> > b/stubdom/grub.patches/11graphics-keyboard.diff
> > new file mode 100644
> > index 0000000..fe17b20
> > --- /dev/null
> > +++ b/stubdom/grub.patches/11graphics-keyboard.diff
> > @@ -0,0 +1,13 @@
> > +diff --git a/stage2/stage2.c b/stage2/stage2.c
> > +index 9d9fcc3..8353a3b 100644
> > +--- a/stage2/stage2.c
> > ++++ b/stage2/stage2.c
> > +@@ -395,7 +395,7 @@ restart:
> > +    pressed.  
> > +    This avoids polling (relevant in the grub-shell and later on
> > +    in grub if interrupt driven I/O is done).  */
> > +-      if (checkkey () >= 0 || grub_timeout < 0)
> > ++      if (checkkey () > 0 || grub_timeout < 0)
> > +   {
> > +     /* Key was pressed, show which entry is selected before GETKEY,
> > +        since we're comming in here also on GRUB_TIMEOUT == -1 and
> > 
> > 
> > 
> > On Thu, 23 Oct 2014, Steven Haigh wrote:
> >> On 23/10/2014 2:40 AM, Ian Campbell wrote:
> >>> On Thu, 2014-10-23 at 02:23 +1100, Steven Haigh wrote:
> >>>
> >>>> Output using pv-grub:
> >>>
> >>> Can you also post the qemu logs please (under /var/log/xen somewhere I
> >>> think).
> >>
> >> I get very little out of this:
> >> -rw-r--r--  1 root root    0 Oct 23 02:45 qemu-dm-dev.vm.log
> >> -rw-r--r--  1 root root    0 Oct 23 02:44 xen-hotplug.log
> >> -rw-r--r--  1 root root   55 Oct 23 02:45 xl-dev.vm.log
> >> [root@dom0 xen]# cat xl-dev.vm.log
> >> Waiting for domain dev.vm (domid 36) to die [pid 6970]
> >>
> >> That's it :\
> >>
> >>>> qemu-system-i38[3956]: segfault at 0 ip           (null) sp
> >>>> 00007fffb4573638 error 4
> >>>
> >>> That might be a smoking gun. Is there a core dump and/or could you try
> >>> and run qemu under gdb?
> >>
> >> Any hints on doing this? I can't say I'm a gdb guru.... I can't find any
> >> core dumps anywhere so that's not really helpful...
> >>
> >> -- 
> >> Steven Haigh
> >>
> >> Email: netwiz@xxxxxxxxx
> >> Web: http://www.crc.id.au
> >> Phone: (03) 9001 6090 - 0412 935 897
> >>
> 
> -- 
> Steven Haigh
> 
> Email: netwiz@xxxxxxxxx
> Web: http://www.crc.id.au
> Phone: (03) 9001 6090 - 0412 935 897
> 
> 

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