linux-kernel - Re: [RESEND][PATCH 2/2 v3] deal with guest panicked event

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Message-ID: <20120308113607.GC25529@redhat.com>
Date:	Thu, 8 Mar 2012 11:36:07 +0000
From:	"Daniel P. Berrange" <berrange@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Wen Congyang <wency@...fujitsu.com>,
	kvm list <kvm@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [RESEND][PATCH 2/2 v3] deal with guest panicked event

On Thu, Mar 08, 2012 at 01:28:56PM +0200, Avi Kivity wrote:
> On 03/08/2012 12:15 PM, Wen Congyang wrote:
> > When the host knows the guest is panicked, it will set
> > exit_reason to KVM_EXIT_GUEST_PANICKED. So if qemu receive
> > this exit_reason, we can send a event to tell management
> > application that the guest is panicked and set the guest
> > status to RUN_STATE_PANICKED.
> >
> > Signed-off-by: Wen Congyang <wency@...fujitsu.com>
> > ---
> >  kvm-all.c        |    5 +++++
> >  monitor.c        |    3 +++
> >  monitor.h        |    1 +
> >  qapi-schema.json |    2 +-
> >  qmp.c            |    3 ++-
> >  vl.c             |    1 +
> >  6 files changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/kvm-all.c b/kvm-all.c
> > index 77eadf6..b3c9a83 100644
> > --- a/kvm-all.c
> > +++ b/kvm-all.c
> > @@ -1290,6 +1290,11 @@ int kvm_cpu_exec(CPUState *env)
> >                      (uint64_t)run->hw.hardware_exit_reason);
> >              ret = -1;
> >              break;
> > +        case KVM_EXIT_GUEST_PANICKED:
> > +            monitor_protocol_event(QEVENT_GUEST_PANICKED, NULL);
> > +            vm_stop(RUN_STATE_PANICKED);
> > +            ret = -1;
> > +            break;
> >
> 
> If the management application is not aware of this event, then it will
> never resume the guest, so it will appear hung.

Even if the mgmt app doesn't know about the QEVENT_GUEST_PANICKED, it should
still see a QEVENT_STOP event emitted by vm_stop() surely ? So it will
know the guest CPUs have been stopped, even if it isn't aware of the
reason why, which seems fine to me.

Daniel
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