On Fri, Aug 07, 2020 at 11:06:47AM +0200, Vitaly Kuznetsov wrote:
> Michael Kelley <mikelley@xxxxxxxxxxxxx> writes:
>
> > Hyper-V currently may be notified of a panic for any die event. But
> > this results in false panic notifications for various user space traps
> > that are die events. Fix this by ignoring die events that aren't oops.
> >
> > Fixes: 510f7aef65bb ("Drivers: hv: vmbus: prefer 'die' notification chain to 'panic'")
> > Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
> > ---
> > drivers/hv/vmbus_drv.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> > index b50081c..910b6e9 100644
> > --- a/drivers/hv/vmbus_drv.c
> > +++ b/drivers/hv/vmbus_drv.c
> > @@ -86,6 +86,10 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
> > struct die_args *die = (struct die_args *)args;
> > struct pt_regs *regs = die->regs;
> >
> > + /* Don't notify Hyper-V if the die event is other than oops */
> > + if (val != DIE_OOPS)
> > + return NOTIFY_DONE;
> > +
>
> Looking at die_val enum, DIE_PANIC also sounds like something we would
> want to report but it doesn't get emitted anywhere and honestly I don't
> quite understand how is was supposed to be different from DIE_OOPS.
>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Applied to hyperv-fixes.
Wei.
>
> > /*
> > * Hyper-V should be notified only once about a panic. If we will be
> > * doing hyperv_report_panic_msg() later with kmsg data, don't do
>
> --
> Vitaly
>
